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yongjie.zhang@ucarinc.com
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stream操作
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17 files changed

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‎java-base.iml

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<exclude-output />
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<content url="file://$MODULE_DIR$">
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<sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/java-classloader/src" isTestSource="false" />
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</content>
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<orderEntry type="inheritedJdk" />
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<orderEntry type="sourceFolder" forTests="false" />

‎java-classloader/src/com/zyj/test/Demo02.java

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@@ -21,5 +21,12 @@ public static void main(String[] args) throws ClassNotFoundException {
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System.out.println(c2.hashCode());
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System.out.println(c3.hashCode());
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//JVM认为被同一个加载器加载的同一个类是相同的类
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System.out.println(c.getClassLoader());
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System.out.println(c1.getClassLoader());
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System.out.println(c2.getClassLoader());
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System.out.println(c3.getClassLoader());
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NetClassLoader netClassLoader = new NetClassLoader("d:/myjava");
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Class c5 = netClassLoader.findClass("com.zyj.test.HelloWorld");
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System.out.println(c5.getName());
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}
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}

‎java-classloader/src/com/zyj/test/Demo04.java

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package com.zyj.test;
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/**
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* 版权声明：CopyRight (c) 2018 ucarinc. All Rights Reserved.
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*
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* @author : 张勇杰
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* @date : 2018/12/14 14:54
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* @Version : v1.0
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* @description
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**/
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public class Demo04 {
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public static void main(String[] args) throws ClassNotFoundException {
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//int a = 3;
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//异或操作，。
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// System.out.println(Integer.toBinaryString(a^0xff));
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FileSystemClassLoader loader = new FileSystemClassLoader("d:/myjava/temp");
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Class<?> c = loader.loadClass("HelloWorld");
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System.out.println(c);
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}
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}

‎java-classloader/src/com/zyj/test/EncrptUtil.java

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package com.zyj.test;
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import java.io.*;
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/**
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* 版权声明：CopyRight (c) 2018 ucarinc. All Rights Reserved.
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*
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* @author : 张勇杰
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* @date : 2018/12/14 15:01
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* @Version : v1.0
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* @description 加密工具类
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**/
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public class EncrptUtil {
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public static void main(String[] args) {
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encrpt(new File("d://myjava/HelloWorld.class"),new File("d://myjava/temp/HelloWorld.class"));
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}
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public static void encrpt(File src,File dest){
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FileInputStream fis = null;
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FileOutputStream fos = null;
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try {
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fis = new FileInputStream(src);
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fos = new FileOutputStream(dest);
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int temp = -1;
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while((temp = fis.read())!=-1){
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fos.write(temp^0xff);
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}
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} catch (Exception e) {
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e.printStackTrace();
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}finally {
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try {
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if(fos!= null){
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fos.close();
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}
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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}
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}

‎java-classloader/src/com/zyj/test/NetClassLoader.java

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package com.zyj.test;
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import java.io.ByteArrayOutputStream;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.net.URL;
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/**
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* 版权声明：CopyRight (c) 2018 ucarinc. All Rights Reserved.
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*
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* @author : 张勇杰
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* @date : 2018/12/14 14:30
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* @Version : v1.0
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* @description
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**/
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public class NetClassLoader extends ClassLoader{
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//d:/myjava/com/zyj/test/User.class -->com.zyj.test.User
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private String rootUrl;
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public NetClassLoader(String rootUrl){
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this.rootUrl = rootUrl;
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}
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@Override
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protected Class<?> findClass(String name) throws ClassNotFoundException {
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Class<?> c = findLoadedClass(name);
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//应该先查询有没有加载过这个类，如果已经加载，则返回已经加载好的类。如果没有，则加载新的类
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if(c != null){
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return c;
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}else{
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if(c != null){
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return c;
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}else{
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byte[] classData = getClassData(name);
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if(classData == null){
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throw new ClassNotFoundException();
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}else{
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c = defineClass(name,classData,0,classData.length);
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}
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}
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}
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return c;
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}
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private byte[] getClassData(String className){
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String path = rootUrl + "/"+className.replace(".","/")+".class";
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//IOUtils,可以使用他将流中的数据转成字节数组
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InputStream is = null;
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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try {
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URL url = new URL(path);
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is = url.openStream();
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byte[] buffer = new byte[1024];
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int temp = 0;
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while((temp = is.read(buffer))!= -1){
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baos.write(buffer,0,temp);
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}
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return baos.toByteArray();
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} catch (Exception e) {
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e.printStackTrace();
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return null;
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}finally {
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if(is != null){
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try {
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is.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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if (baos != null) {
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try {
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baos.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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}
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}
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}

‎java-jvm/java-jvm.iml

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<?xml version="1.0" encoding="UTF-8"?>
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<module type="JAVA_MODULE" version="4">
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<component name="NewModuleRootManager" inherit-compiler-output="true">
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<exclude-output />
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<content url="file://$MODULE_DIR$">
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<sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
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</content>
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<orderEntry type="inheritedJdk" />
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<orderEntry type="sourceFolder" forTests="false" />
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</component>
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</module>

‎java-jvm/src/com/asher/learn/jvm/StackLeafOOF.java

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package com.asher.learn.jvm;
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/**
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*
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* @author : 张勇杰
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* @date : 2019/3/11 10:58
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* @Version : v1.0
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* @description
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* VM Args: -Xss 128K
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**/
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public class StackLeafOOF {
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private int stackLength = 1;
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private void stackLeaf() {
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stackLength++;
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stackLeaf();
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}
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public static void main(String[] args) {
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StackLeafOOF oof = new StackLeafOOF();
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try {
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oof.stackLeaf();
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}catch (Throwable e){
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System.out.println("stack length:"+oof.stackLength);
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throw e;
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}
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}
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}

‎java-stream/src/com/asher/stream/test/ConsumerTest.java

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package com.asher.stream.test;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.List;
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import java.util.function.Consumer;
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import java.util.function.Predicate;
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import java.util.function.UnaryOperator;
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import java.util.stream.Stream;
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/**
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*
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* @author : 张勇杰
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* @date : 2019/7/2 18:02
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* @Version : v1.0
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* @description
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**/
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public class ConsumerTest {
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public static void main(String[] args) {
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// Consumer f = System.out::println;
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// Consumer f2 = (n) -> System.out.println("666"+n);
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// f.andThen(f2).andThen(f2).andThen(f2).accept("zhang");
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// f2.accept("1");
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// List<Integer> list = Arrays.asList(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20);
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// ArrayList<Integer> collect = list.stream().filter(n -> n > 10 && n<15).collect(() -> new ArrayList<>(),
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// (list1, item) -> list1.add(item), (list2, list1) -> list2.addAll(list1));
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// collect.forEach(System.out::print);
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// Stream.iterate(1, new Predicate<Integer>() {
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// @Override
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// public boolean test(Integer integer) {
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// return integer <= 10;
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// }
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// }, new UnaryOperator<Integer>() {
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// @Override
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// public Integer apply(Integer integer) {
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// return integer*2;
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// }
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// }).forEach(System.out::println);
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Stream.iterate(1, n->n<10,n->n*3).forEach(System.out::println);
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}
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}

‎java-stream/src/com/asher/stream/test/DemoInterface.java

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package com.asher.stream.test;
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import java.util.Date;
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public interface DemoInterface {
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default void now(){
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System.out.println(new Date());
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}
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}

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