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Java第二十四天
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‎day24/code/day24_Pattern/.classpath

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<?xml version="1.0" encoding="UTF-8"?>
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<classpath>
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<classpathentry kind="src" path="src"/>
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<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.7"/>
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<classpathentry kind="output" path="bin"/>
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</classpath>

‎day24/code/day24_Pattern/.project

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<?xml version="1.0" encoding="UTF-8"?>
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<projectDescription>
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<name>day24_Pattern</name>
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<comment></comment>
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<projects>
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</projects>
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<buildSpec>
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<buildCommand>
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<name>org.eclipse.jdt.core.javabuilder</name>
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<arguments>
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</arguments>
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</buildCommand>
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</buildSpec>
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<natures>
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<nature>org.eclipse.jdt.core.javanature</nature>
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</natures>
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</projectDescription>

‎day24/code/day24_Pattern/.settings/org.eclipse.jdt.core.prefs

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eclipse.preferences.version=1
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org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
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org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.7
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org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
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org.eclipse.jdt.core.compiler.compliance=1.7
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org.eclipse.jdt.core.compiler.debug.lineNumber=generate
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org.eclipse.jdt.core.compiler.debug.localVariable=generate
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org.eclipse.jdt.core.compiler.debug.sourceFile=generate
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org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
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org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
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org.eclipse.jdt.core.compiler.source=1.7

‎day24/code/day24_Pattern/bin/cn/itcast_01/SingletDemo.class

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‎day24/code/day24_Pattern/bin/cn/itcast_01/Student.class

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‎day24/code/day24_Pattern/bin/cn/itcast_02/SingletDemo.class

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‎day24/code/day24_Pattern/bin/cn/itcast_02/Teacher.class

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‎day24/code/day24_Pattern/bin/cn/itcast_03/RuntimeDemo.class

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‎day24/code/day24_Pattern/src/cn/itcast_01/SingletDemo.java

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package cn.itcast_01;
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/*
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* 设计模式：经验的总结。是一套模型。
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*
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* 分类：
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* 创建型模式
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* 行为型模式
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* 结构型模式
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*
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* 单例模式：保证类在内存中只有一个对象。
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* 举例：
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* windows打印机，网站计数器
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*
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* 如何能够保证类在内存中只有一个对象呢?
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* A:让外界不能创建对象
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* 构造私有
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* B:本身提供一个对象
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* 在成员位置创建对象
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* C:对外提供公共的访问方式
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* 写一个公共方法即可
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*/
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public class SingletDemo {
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public static void main(String[] args) {
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// Student s1 = new Student();
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// Student s2 = new Student();
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// System.out.println(s1 == s2);
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// Student.s = null;
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Student s1 = Student.getStudent();
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Student s2 = Student.getStudent();
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System.out.println(s1 == s2);
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}
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}

‎day24/code/day24_Pattern/src/cn/itcast_01/Student.java

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package cn.itcast_01;
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public class Student {
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// 构造私有
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private Student() {
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}
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// 本身创建
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// 静态只能访问静态,加static
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// 为了不让外加访问，加private
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private static Student s = new Student();
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// 提供公共访问
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// 为了让外界可以直接访问，加static
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public static Student getStudent() {
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return s;
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}
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}

‎day24/code/day24_Pattern/src/cn/itcast_02/SingletDemo.java

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package cn.itcast_02;
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public class SingletDemo {
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public static void main(String[] args) {
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Teacher t1 = Teacher.getTeacher();
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Teacher t2 = Teacher.getTeacher();
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System.out.println(t1 == t2);
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}
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}

‎day24/code/day24_Pattern/src/cn/itcast_02/Teacher.java

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package cn.itcast_02;
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/*
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* 饿汉式：加载的时候就创建对象
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* 懒汉式：在用的时候再去创建对象
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* 线程安全问题
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* 延迟加载思想(什么时候用，什么时候加载)
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*
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* 面试题:请写一个Singleton
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* 面试：懒汉式
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* 开发：饿汉式
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*
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* 为什么呢?
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* 懒汉式容易出问题，而饿汉式不会出问题。
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* 线程安全问题。
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*/
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public class Teacher {
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private Teacher() {
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}
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private static Teacher t = null;
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public synchronized static Teacher getTeacher() {
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// t1,t2,t3
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if (t == null) {
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// t1,t2,t3
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t = new Teacher();
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}
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return t;
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}
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}

‎day24/code/day24_Pattern/src/cn/itcast_03/RuntimeDemo.java

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package cn.itcast_03;
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import java.io.IOException;
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/*
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* Runtime：
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* public static Runtime getRuntime()
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*
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* 没有构造，方法不全是静态的。
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* 这中类肯定是通过静态的方法返回了该类的对象。
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*/
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public class RuntimeDemo {
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public static void main(String[] args) throws IOException {
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Runtime r = Runtime.getRuntime();
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// r.exec("calc");
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r.exec("notepad");
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}
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}

‎day24/code/day24_Thread/.classpath

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<?xml version="1.0" encoding="UTF-8"?>
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<classpath>
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<classpathentry kind="src" path="src"/>
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<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.7"/>
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<classpathentry kind="output" path="bin"/>
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</classpath>

‎day24/code/day24_Thread/.project

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<?xml version="1.0" encoding="UTF-8"?>
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<projectDescription>
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<name>day24_Thread</name>
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<comment></comment>
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<projects>
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</projects>
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<buildSpec>
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<buildCommand>
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<name>org.eclipse.jdt.core.javabuilder</name>
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<arguments>
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</arguments>
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</buildCommand>
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</buildSpec>
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<natures>
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<nature>org.eclipse.jdt.core.javanature</nature>
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</natures>
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</projectDescription>

‎day24/code/day24_Thread/.settings/org.eclipse.core.resources.prefs

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eclipse.preferences.version=1
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encoding//src/cn/itcast_07/ThreadGroupRunnableDemo.java=UTF-8

‎day24/code/day24_Thread/.settings/org.eclipse.jdt.core.prefs

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eclipse.preferences.version=1
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org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
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org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.7
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org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
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org.eclipse.jdt.core.compiler.compliance=1.7
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org.eclipse.jdt.core.compiler.debug.lineNumber=generate
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org.eclipse.jdt.core.compiler.debug.localVariable=generate
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org.eclipse.jdt.core.compiler.debug.sourceFile=generate
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org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
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org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
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org.eclipse.jdt.core.compiler.source=1.7

‎day24/code/day24_Thread/bin/cn/itcast_01/MovieTicket.class

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‎day24/code/day24_Thread/bin/cn/itcast_01/MovieTicketDemo.class

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‎day24/code/day24_Thread/bin/cn/itcast_02/DieLock.class

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‎day24/code/day24_Thread/bin/cn/itcast_02/DieLockDemo.class

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‎day24/code/day24_Thread/bin/cn/itcast_02/MyLock.class

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‎day24/code/day24_Thread/bin/cn/itcast_03/GetThread.class

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‎day24/code/day24_Thread/bin/cn/itcast_03/SetThread.class

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‎day24/code/day24_Thread/bin/cn/itcast_03/Student.class

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‎day24/code/day24_Thread/bin/cn/itcast_03/StudentDemo.class

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‎day24/code/day24_Thread/bin/cn/itcast_04/GetThread.class

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‎day24/code/day24_Thread/bin/cn/itcast_04/SetThread.class

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‎day24/code/day24_Thread/bin/cn/itcast_04/Student.class

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‎day24/code/day24_Thread/bin/cn/itcast_04/StudentDemo.class

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‎day24/code/day24_Thread/bin/cn/itcast_05/GetThread.class

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‎day24/code/day24_Thread/bin/cn/itcast_05/SetThread.class

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‎day24/code/day24_Thread/bin/cn/itcast_05/Student.class

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‎day24/code/day24_Thread/bin/cn/itcast_05/StudentDemo.class

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‎day24/code/day24_Thread/bin/cn/itcast_06/GetThread.class

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‎day24/code/day24_Thread/bin/cn/itcast_06/SetThread.class

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‎day24/code/day24_Thread/bin/cn/itcast_06/Student.class

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‎day24/code/day24_Thread/bin/cn/itcast_06/StudentDemo.class

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‎day24/code/day24_Thread/bin/cn/itcast_07/ThreadGroupRunnable.class

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‎day24/code/day24_Thread/bin/cn/itcast_07/ThreadGroupRunnableDemo.class

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‎day24/code/day24_Thread/bin/cn/itcast_08/MyRunnable.class

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‎day24/code/day24_Thread/bin/cn/itcast_08/ThreadPoolDemo.class

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‎day24/code/day24_Thread/bin/cn/itcast_09/MyCallable.class

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‎day24/code/day24_Thread/bin/cn/itcast_09/ThreadPoolDemo.class

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‎day24/code/day24_Thread/bin/cn/itcast_10/MyCallable.class

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‎day24/code/day24_Thread/bin/cn/itcast_10/ThreadPoolDemo.class

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‎day24/code/day24_Thread/bin/cn/itcast_11/NiMingDemo$1.class

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‎day24/code/day24_Thread/bin/cn/itcast_11/NiMingDemo$2.class

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‎day24/code/day24_Thread/bin/cn/itcast_11/NiMingDemo.class

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‎day24/code/day24_Thread/bin/cn/itcast_12/DeleteFolder.class

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‎day24/code/day24_Thread/bin/cn/itcast_12/MyTask.class

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‎day24/code/day24_Thread/bin/cn/itcast_12/TimerDemo$1.class

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‎day24/code/day24_Thread/bin/cn/itcast_12/TimerDemo.class

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‎day24/code/day24_Thread/bin/cn/itcast_12/TimerDemo2$1.class

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‎day24/code/day24_Thread/bin/cn/itcast_12/TimerDemo2.class

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‎day24/code/day24_Thread/bin/cn/itcast_12/TimerTest.class

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‎day24/code/day24_Thread/src/cn/itcast_01/MovieTicket.java

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package cn.itcast_01;
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import java.util.concurrent.locks.Lock;
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import java.util.concurrent.locks.ReentrantLock;
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public class MovieTicket implements Runnable {
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private int tickets = 100;
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private Object obj = new Object();
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// 造锁
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// private ReentrantLock lock = new ReentrantLock();
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private Lock lock = new ReentrantLock();
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// @Override
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// public void run() {
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// while (true) {
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// synchronized (obj) {
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// if (tickets > 0) {
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// try {
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// Thread.sleep(100);
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// } catch (InterruptedException e) {
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// e.printStackTrace();
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// }
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//
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// System.out.println(Thread.currentThread().getName()
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// + "正在出售第" + (tickets--) + "张票");
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// }
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// }
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// }
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// }
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@Override
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public void run() {
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while (true) {
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try {
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// 加锁
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lock.lock();
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if (tickets > 0) {
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try {
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Thread.sleep(100);
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} catch (InterruptedException e) {
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e.printStackTrace();
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}
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System.out.println(Thread.currentThread().getName()
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+ "正在出售第" + (tickets--) + "张票");
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}
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} finally {
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// 释放锁
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lock.unlock();
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}
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}
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}
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}

‎day24/code/day24_Thread/src/cn/itcast_01/MovieTicketDemo.java

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package cn.itcast_01;
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/*
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* 为了更清楚的让我们知道是如何加锁和释放锁的，JDK5以后就提供了一个接口：Lock锁。
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* Lock
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* public void lock():加锁
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* public void unlock():释放锁
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* 实现类对象
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* public ReentrantLock()
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*/
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public class MovieTicketDemo {
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public static void main(String[] args) {
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MovieTicket mt = new MovieTicket();
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Thread t1 = new Thread(mt, "窗口1");
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Thread t2 = new Thread(mt, "窗口2");
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Thread t3 = new Thread(mt, "窗口3");
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t1.start();
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t2.start();
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t3.start();
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}
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}

‎day24/code/day24_Thread/src/cn/itcast_02/DieLock.java

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package cn.itcast_02;
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public class DieLock extends Thread {
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private boolean flag;
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public DieLock(boolean flag) {
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this.flag = flag;
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}
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@Override
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public void run() {
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if (flag) {
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synchronized (MyLock.objA) {
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System.out.println("if objA"); // CPUµÄÖ´ÐÐȨûÓÐÁË
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synchronized (MyLock.objB) {
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System.out.println("if objB");
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}
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}
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} else {
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synchronized (MyLock.objB) {
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System.out.println("else objB");
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synchronized (MyLock.objA) {
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System.out.println("else objA");
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}
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}
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}
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}
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}

‎day24/code/day24_Thread/src/cn/itcast_02/DieLockDemo.java

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package cn.itcast_02;
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/*
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* 死锁：是指两个或者两个以上的线程在执行的过程中，因争夺资源产生的一种互相等待现象
5+
*
6+
* 举例：
7+
* 中国人和一个美国人吃饭。
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* 中国人：两只筷子
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* 美国人：刀叉
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* 真实情况：
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* 中国人：一只筷子，一把刀
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* 美国人：一只筷子，一把叉
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*/
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public class DieLockDemo {
15+
public static void main(String[] args) {
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DieLock d1 = new DieLock(true);
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DieLock d2 = new DieLock(false);
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d1.start();
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d2.start();
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}
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}

‎day24/code/day24_Thread/src/cn/itcast_02/MyLock.java

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package cn.itcast_02;
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public class MyLock {
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public static final Object objA = new Object();
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public static final Object objB = new Object();
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}

‎day24/code/day24_Thread/src/cn/itcast_03/GetThread.java

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package cn.itcast_03;
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public class GetThread implements Runnable {
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private Student s;
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public GetThread(Student s) {
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this.s = s;
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}
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@Override
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public void run() {
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// Student s = new Student();
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System.out.println(s.name + "---" + s.age);
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}
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}

‎day24/code/day24_Thread/src/cn/itcast_03/SetThread.java

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package cn.itcast_03;
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public class SetThread implements Runnable {
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private Student s;
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public SetThread(Student s) {
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this.s = s;
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}
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@Override
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public void run() {
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// Student s = new Student();
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s.name = "ÁÖÇàϼ";
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s.age = 28;
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}
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}

‎day24/code/day24_Thread/src/cn/itcast_03/Student.java

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package cn.itcast_03;
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public class Student {
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String name;
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int age;
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}

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