From 644691e70e5daf6c1fb20ef63e2aed4a471c7d59 Mon Sep 17 00:00:00 2001 From: fanggan Date: Mon, 8 Mar 2021 13:58:33 +0800 Subject: [PATCH 1/2] =?UTF-8?q?Update=2020=E3=80=81javac=E5=92=8Cjavap.md?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../20\343\200\201javac\345\222\214javap.md" | 120 +++++++++--------- 1 file changed, 60 insertions(+), 60 deletions(-) diff --git "a/docs/java/basic/20\343\200\201javac\345\222\214javap.md" "b/docs/java/basic/20\343\200\201javac\345\222\214javap.md" index dde513d..5a6f1cb 100644 --- "a/docs/java/basic/20\343\200\201javac\345\222\214javap.md" +++ "b/docs/java/basic/20\343\200\201javac\345\222\214javap.md" @@ -125,48 +125,48 @@ java提供了JavaCompiler，我们可以通过它来编译java源文件为class task.call(); -​ -​ // 通过反射得到对象 -​ // Class clazz = Class.forName("com.tommy.core.test.reflect.Test"); -​ // 使用自定义的类加载器加载class -​ Class clazz = new MyClassLoader(baseOutputDir).loadClass("com.tommy.core.test.reflect.Test"); -​ // 得到构造器 -​ Constructor constructor = clazz.getConstructor(String.class); -​ // 通过构造器new一个对象 -​ Object test = constructor.newInstance("jack.tsing"); -​ // 得到sayHello方法 -​ Method method = clazz.getMethod("sayHello", String.class); -​ // 调用sayHello方法 -​ String result = (String) method.invoke(test, "jack.ma"); -​ System.out.println(result); -​ } -​ } + + // 通过反射得到对象 + // Class clazz = Class.forName("com.tommy.core.test.reflect.Test"); + // 使用自定义的类加载器加载class + Class clazz = new MyClassLoader(baseOutputDir).loadClass("com.tommy.core.test.reflect.Test"); + // 得到构造器 + Constructor constructor = clazz.getConstructor(String.class); + // 通过构造器new一个对象 + Object test = constructor.newInstance("jack.tsing"); + // 得到sayHello方法 + Method method = clazz.getMethod("sayHello", String.class); + // 调用sayHello方法 + String result = (String) method.invoke(test, "jack.ma"); + System.out.println(result); + } + } 自定义类加载器代码： -​ -​ public class MyClassLoader extends ClassLoader { -​ private String baseDir; -​ public MyClassLoader(String baseDir) { -​ this.baseDir = baseDir; -​ } -​ @Override -​ protected Class findClass(String name) throws ClassNotFoundException { -​ String fullClassFilePath = this.baseDir + name.replace("\\.","/") + ".class"; -​ File classFilePath = new File(fullClassFilePath); -​ if (classFilePath.exists()) { -​ FileInputStream fileInputStream = null; -​ ByteArrayOutputStream byteArrayOutputStream = null; -​ try { -​ fileInputStream = new FileInputStream(classFilePath); -​ byte[] data = new byte[1024]; -​ int len = -1; -​ byteArrayOutputStream = new ByteArrayOutputStream(); -​ while ((len = fileInputStream.read(data)) != -1) { -​ byteArrayOutputStream.write(data,0,len); -​ } -​ + + public class MyClassLoader extends ClassLoader { + private String baseDir; + public MyClassLoader(String baseDir) { + this.baseDir = baseDir; + } + @Override + protected Class findClass(String name) throws ClassNotFoundException { + String fullClassFilePath = this.baseDir + name.replace("\\.","/") + ".class"; + File classFilePath = new File(fullClassFilePath); + if (classFilePath.exists()) { + FileInputStream fileInputStream = null; + ByteArrayOutputStream byteArrayOutputStream = null; + try { + fileInputStream = new FileInputStream(classFilePath); + byte[] data = new byte[1024]; + int len = -1; + byteArrayOutputStream = new ByteArrayOutputStream(); + while ((len = fileInputStream.read(data)) != -1) { + byteArrayOutputStream.write(data,0,len); + } + return defineClass(name,byteArrayOutputStream.toByteArray(),0,byteArrayOutputStream.size()); } catch (FileNotFoundException e) { e.printStackTrace(); @@ -403,15 +403,15 @@ Xml代码 } -​ -​ -​ public class B -​ { -​ public void print() -​ { -​ System.out.println("old"); -​ } -​ } + + + public class B + { + public void print() + { + System.out.println("old"); + } + } 目录结构如下： @@ -451,19 +451,19 @@ sourcepath //此处为当前目录 这里我用来实现一下这个功能，假设项目名称为project，此目录为当前目录，且在src/com目录中有一个Main.java文件。‘ -​ -​ package com; -​ public class Main -​ { -​ public static void main(String[] args) { -​ System.out.println("Hello"); -​ } -​ } + + package com; + public class Main + { + public static void main(String[] args) { + System.out.println("Hello"); + } + } -​ -​ -​ javac -d bin src/com/Main.java + + + javac -d bin src/com/Main.java 上面的语句将Main.class生成在bin/com目录下。 @@ -487,8 +487,8 @@ sourcepath //此处为当前目录 如果使用： -​ -​ javac -implicit:none A.java + + javac -implicit:none A.java 则不会生成 B.class。 From dcd6f47167c8e24811e824a9217cd1ce1c2595cc Mon Sep 17 00:00:00 2001 From: fanggan Date: Mon, 8 Mar 2021 15:14:47 +0800 Subject: [PATCH 2/2] =?UTF-8?q?Update=2022=E3=80=81=E5=BA=8F=E5=88=97?= =?UTF-8?q?=E5=8C=96=E5=92=8C=E5=8F=8D=E5=BA=8F=E5=88=97=E5=8C=96.md?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- ...14\345\217\215\345\272\217\345\210\227\345\214\226.md" | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git "a/docs/java/basic/22\343\200\201\345\272\217\345\210\227\345\214\226\345\222\214\345\217\215\345\272\217\345\210\227\345\214\226.md" "b/docs/java/basic/22\343\200\201\345\272\217\345\210\227\345\214\226\345\222\214\345\217\215\345\272\217\345\210\227\345\214\226.md" index 6de5ffb..8076103 100644 --- "a/docs/java/basic/22\343\200\201\345\272\217\345\210\227\345\214\226\345\222\214\345\217\215\345\272\217\345\210\227\345\214\226.md" +++ "b/docs/java/basic/22\343\200\201\345\272\217\345\210\227\345\214\226\345\222\214\345\217\215\345\272\217\345\210\227\345\214\226.md" @@ -88,11 +88,9 @@ Java为了方便开发人员将Java对象进行序列化及反序列化提供了 下面是一个实现了java.io.Serializable接口的类 public class 序列化和反序列化 { - - -​ -​ public static void main(String[] args) { -​ + + public static void main(String[] args) { + } //注意，内部类不能进行序列化，因为它依赖于外部类 @Test