第七章作业

第一题：每个线程分别与CPU交互，由CPU分配工作。 第二题：直接调用还是单线程，他是用主线程直接执行的。 第三题：创建状态：就是new一个线程 就绪状态：准备获得CPU的同意 阻塞状态：等待其他线程运行中 运行状态：正在执行CPU分配的任务中 死亡状态：线程自然执行完毕，外部干涉终止线程 4.代码：

public class xiancheng4 extends Thread { @Override public void run() { // TODO Auto-generated method stub Thread.currentThread().setName(“线程1”); for (int i = 0; i <+ 5; i++) { System.out.println(i+"—"+Thread.currentThread().getName()); } }

}

public class xiancheng4_2 implements Runnable {

@Override public void run() { Thread.currentThread().setName("线程2"); // TODO Auto-generated method stub for (int i = 0; i <+5; i++) { System.out.println(i+"---"+Thread.currentThread().getName()); } } public static void main(String[] args) { xiancheng4 x=new xiancheng4(); xiancheng4_2 x2=new xiancheng4_2(); Thread t1=new Thread(x2); // TODO Auto-generated method stub x.start(); t1.start(); }

}

第五题：

public class quqian implements Runnable { private int money=500;

@Override public void run() { while(true){ synchronized (this) {System.out.println(Thread.currentThread().getName()+"准备取钱"+"取钱完成"); try { Thread.sleep(500); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } money=money-100; if (money<=0) { System.out.println(Thread.currentThread().getName()+"取钱失败，余额不足");

// System.exit(0); break; } }}

} public static void main(String[] args) { quqian q1=new quqian(); Thread t1=new Thread(q1,"张三"); Thread t2=new Thread(q1,"张三的妻子"); t1.start(); t2.start(); }

}

学员操作：

public class xiancheng extends Thread {

@Override public void run() { for (int i = 0; i <5; i++) { System.out.println(Thread.currentThread().getName()+"asd"+i); } }

}

import java.util.Scanner;

public class test22 {

public static void main(String[] args) { // TODO Auto-generated method stub

// test2 t=new test2(); // Scanner a=new Scanner(System.in); // System.out.println(“请输入1-100的数字”); // try { // int b=a.nextInt(); // t.setAge(b); // } catch (Exception e) { // // TODO: handle exception // e.printStackTrace(); // // }

// xiancheng x=new xiancheng(); // x.start(); jiekou j=new jiekou(); Thread a1=new Thread(j); Thread a2=new Thread(j); a1.start(); try { a1.join(); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); }

a2.start(); }

}

public class jielisaipao implements Runnable { private int num1=1000; private int num2=10; public void run() { while (true) { synchronized (this) { if (num1==0) { System.out.println(“asdsad”); break; }else {

System.out.println(Thread.currentThread().getName()+"号选手拿到了接力棒"); for (int i = 1; i <=10; i++) { System.out.println(Thread.currentThread().getName()+"号跑了"+(i*num2)+"米"); try { Thread.sleep(100); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }num1=num1-100; System.out.println(num1); } } }

}

import java.util.HashMap; import java.util.Hashtable;

public class jieli {

public static void main(String[] args) { // TODO Auto-generated method stub jielisaipao j=new jielisaipao(); Thread t1=new Thread(j,"1"); Thread t2=new Thread(j,"2"); Thread t3=new Thread(j,"3"); Thread t4=new Thread(j,"4"); Thread t5=new Thread(j,"5");

// t1.start(); t2.start(); t3.start(); t4.start(); t5.start();

}

}