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一些工具类的测试
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Lines changed: 191 additions & 4 deletions

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‎JavaTest_Zone/src/classload/DynamicLoaderTestCase.java‎

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@@ -69,9 +69,6 @@ private static void testParent() throws ClassNotFoundException, InstantiationExc
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// clazz.getGenericSuperclass();
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Child parent = (Child) (clazz.newInstance());
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Map<String, byte[]> bytecode2 = DynamicLoader.compile("TestClass.java", javaSrc);
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classLoader.add(bytecode2);
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Class clazz2 = classLoader.loadClass("TestClass");

‎JavaTest_Zone/src/staticUtils顺序/Us.java‎

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package staticUtils顺序;
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public class Us {
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static int i=1;
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static {
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i=2;
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System.out.println(i);
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System.out.println("static　前面的");
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}
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public static void gaga(){
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static {
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System.out.println("static　后边的");
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}
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}

‎JavaTest_Zone/src/并发/valatitle/VolatileTest.java‎

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package 并发.valatitle;
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/**
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* Created by fuzhipeng on 2016/12/2.
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*/
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public class VolatileTest {
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//TODO volatile 第一个语义 所有线程的可见性。保证读取的值是最新;
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//TODO volatile 第2个语义 禁止指令重排序优化;
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//TODO 正确性的: 1. 确保单一线程(多线程就要 同步)修改值, 2 读取的话,是没有问题的;
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static volatile boolean shutdownRequested;
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public void shutdown() {
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shutdownRequested = true;
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}
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public void doWork() {
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while (!shutdownRequested) {
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System.out.println(Thread.currentThread() + ":haha");
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}
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System.out.println(Thread.currentThread() + ":停下来了");
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}
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public static void main(String[] args) throws InterruptedException {
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for (int i = 0; i < 5; i++) {
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new Thread(new Runnable() {
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@Override
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public void run() {
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new VolatileTest().doWork();
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}
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}).start();
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}
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Thread.sleep(100);
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synchronized (VolatileTest.class){
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VolatileTest.shutdownRequested=true;
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System.out.println("---Stop---");
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}
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}
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}

‎JavaTest_Zone/src/并发/valatitle/反面教材/VolatitleFail1.java‎

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package 并发.valatitle.反面教材;
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/**
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* Created by fuzhipeng on 2016/12/2.
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*/
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public class VolatitleFail1 {
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//TODO volatile:保证了读取的值是正确的,
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//todo 但是++不是原子操作,那么并行的时候可能同时读取到race而不做真正的加1操作,
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//TODO 那么 同时读取的值 同时 在读取的值上+1 返回给race的时候 ,就相当于变少了;
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public static volatile int race=0;
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public static void main(String[] args) {
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for (int i = 0; i < 20; i++) {
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new Thread(new Runnable() {
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@Override
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public void run() {
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for (int i1 = 0; i1 < 10000; i1++) {
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race++;
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}
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}
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}).start();
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}
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//当前活着的线程个数
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while(Thread.activeCount()>2)//大于两个我就等待 ,知道所有活着的<2就是1,就是main这个 就可以执行了
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//就是说当一个线程使用了这个方法之后，它就会把自己CPU执行的时间让掉，
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Thread.yield();
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System.out.println(race);
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}
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}

‎JavaTest_Zone/src/父类相关/Par_.java‎

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package 父类相关;
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/**
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* Created by fuzhipeng on 2016/12/1.
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*/
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public class Par_ {
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public void heihei(){
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return ;
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}
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}

‎JavaTest_Zone/src/访问权限/Bao.java‎

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package 访问权限;
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import java.util.HashMap;
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/**
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* Created by fuzhipeng on 2016/12/5.
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*/
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public class Bao {
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public static int b;
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}

‎JavaTest_Zone/src/访问权限/包1/HeiTEST.java‎

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package 访问权限.包1;
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import 访问权限.Bao;
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/**
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* Created by fuzhipeng on 2016/12/5.
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*/
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public class HeiTEST {
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public static void main(String[] args) {
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int k=Bao.b;
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}
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}

‎JavaTest_Zone/src/语法糖/Sugar.java‎

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package 语法糖;
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import java.util.Arrays;
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import java.util.List;
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/**
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* Created by fuzhipeng on 2016/12/2.
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*/
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public class Sugar {
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//看bin目录下的编译文件;
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public static void main(String[] args) {
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//泛型 自动装箱,自动拆箱,便利循环,变长参数;
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List<Integer> list= Arrays.asList(1,2,3,4);
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int sum=0;
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for (int integer : list) {
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sum+=integer;
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}
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System.out.println(sum);
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}
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// // FIXME: 2016/12/2 下面两个,类型擦除 后是一样的所以不行
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// public static void ak(List<String> stringList){
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//
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// }
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// public static void ak(List<Integer> intList){
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//
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// }
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}

‎JavaTest_Zone/src/语法糖/推断泛型.java‎

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package 语法糖;
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/**
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* Created by fuzhipeng on 2016/12/9.
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*/
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public class 推断泛型 {
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public static void main(String[] args) {
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Integer i = get(new Child1());
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}
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private static <T> T get(Par v) {
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return (T) v;
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}
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public static class Par {
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}
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public static class Child1 extends Par {
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}
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public static class Child2 extends Par {
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}
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}

‎JavaTest_Zone/src/语法糖/自动装箱陷阱.java‎

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package 语法糖;
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/**
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* Created by fuzhipeng on 2016/12/2.
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*/
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public class 自动装箱陷阱 {
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public static void main(String[] args) {
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Integer a = 1;
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Integer b = 2;
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Integer c = 3;
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Integer d = 3;
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Integer e = 321;
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Integer f = 321;
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Long g = 3L;
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System.out.println(c == d);
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//todo 为什么e==f 是false
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//原因 这是源码中的 Integer 中 valueOf，也就是说cache中已有-128到127，不在这范围的会新new ，这时可以理解比较是内存地址
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System.out.println(e == f);
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System.out.println(c == (a + b));
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System.out.println(c.equals(a + b));
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System.out.println(g == (a + b));
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System.out.println(g.equals(a + b));
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}
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}

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