java线程两种实现方式的区别，你所不知道的小细节

/* * 创建线程时要继承Runnable接口 * 不要把宝贵的单继承机会占有掉 * 两种方式有点不用，实现Runnable * 接口时多个线程中执行一个 * Runnable接口实现类时，run方法资源共享 * 而继承Thread时，run方法资源是 * 不能共享的！ */public class Test_Runnable_Thread {public static void main(String[] args) {/* * 下面的代码执行400次打印语句 */SubThread subT1 = new SubThread();SubThread subT2 = new SubThread();SubThread subT3 = new SubThread();SubThread subT4 = new SubThread();subT1.start();subT2.start();subT3.start();subT4.start();/* * 下面的代码执行100次打印语句 */SubRunnable subR = new SubRunnable();Thread th1 = new Thread(subR);Thread th2 = new Thread(subR);Thread th3 = new Thread(subR);Thread th4 = new Thread(subR);th1.start();th2.start();th3.start();th4.start();}}class SubRunnable implements Runnable {private int id = 100;@Overridepublic void run() {while (true) { // 请自动关闭死循环，为了效果设置死循环 dos窗口中ctrl+c关闭if (id > 0) {System.out.println(Thread.currentThread().getName() + "run..."+ id--);}}}}class SubThread extends Thread {private int id = 100;@Overridepublic void run() {while (true) { // 请自动关闭死循环，为了效果设置死循环 dos窗口中ctrl+c关闭if (id > 0) {System.out.println(Thread.currentThread().getName() + "run..."+ id--);}}}}