java Thread 和Runnable区别

类A

public class A extends Thread {private Runnable B;@Overridepublic void run() {// TODO Auto-generated method stubsuper.run();synchronized (this) {B.run();for (int i = 0; i < 10; i++) {System.out.println("the i is/t" + i);}}for (int j = 0; j < 10; j++) {System.out.println("the j is/t" + j);}}//public void getEvent(Runnable B) {synchronized (this) {this.B = B;}}} 

类B

public class B implements Runnable {@Overridepublic void run() {// TODO Auto-generated method stubfor (int j = 0; j < 10; j++) {System.out.println("the m is/t" + j);}}} 

B b=new B();A a=new A();a.getEvent(b);a.start(); 

结果是如下：

the m is0the m is1the m is2the m is3the m is4the m is5the m is6the m is7the m is8the m is9the i is0the i is1the i is2the i is3the i is4the i is5the i is6the i is7the i is8the i is9the j is0the j is1the j is2the j is3the j is4the j is5the j is6the j is7the j is8the j is9 

B变成Thread

 

public class B extends Thread {@Overridepublic void run() {// TODO Auto-generated method stubfor (int j = 0; j < 10; j++) {System.out.println("the m is/t" + j);}}}

把A中 B.run-->B.start();

得到的结果就m的位置是随机。。。。

the i is0the i is1the i is2the i is3the i is4the i is5the i is6the m is0the m is1the m is2the m is3the m is4the m is5the m is6the m is7the m is8the m is9the i is7the i is8the i is9the j is0the j is1the j is2the j is3the j is4the j is5the j is6the j is7the j is8the j is9 

 

 

问题：Runnable和Thread实现的有何区别？A.run()和A.start()区别？？

 

 

通过调用Thread类的start()方法来启动一个线程，这时此线程是处于就绪状态，并没有运行。然后通过此Thread类调用方法run()来完成其运行操作的，这里方法run()称为线程体，它包含了要执行的这个线程的内容，Run方法运行结束，此线程终止，而CPU再运行其它线程，而如果直接用Run方法，这只是调用一个方法而已，程序中依然只有主线程--这一个线程，其程序执行路径还是只有一条，这样就没有达到写线程的目的。