class SubThread extends Thread{ public void run(){ for (int i=1; i<=20; i++) system.out
class SubThread extends Thread{ public void run(){ for (int i=1; i<=20; i++) system.out.print("次" + i ", "); } public testextendsthread{ static void main(string[] args){ subthread sub="new" subthread(); sub.start(); for (int system.out.print("主" 线程sub获得cpu使用权时,会执行sunthread类中的run()方法。(>