多线程创建的两种方式和线程同步问题实例

package jsj.java.exam.test08;

import java.util.Date;

/**
* 模拟左右手写字。
*
* 请完善程序。
*/
public class Multithreading {

public static void main(String[] args) {
// 创建LeftThread 线程
//Thread left = ________081________;//2
Thread left=new LeftThread();
// 用 RightThread 创建线程
//Thread right = new Thread(________082________);//2
Thread right = new Thread(new RightThread());
// 修改线程名称
left.setName("左手线程");
right.setName("右手线程");

// TODO 启动两个线程
//________083________;//1
//________084________;//1
left.start();
right.start();
}

}

//class LeftThread extends ________085________ {//2
class LeftThread extends Thread {

public void run() {
for(int i=0; i<10; i++) {
System.out.println("我是左手线程");

}
}
}
//class RightThread implements ________086________ {//2
class RightThread implements Runnable {

public void run() {
for(int i=0; i<10; i++) {
System.out.println("我是右手线程");
}
}
}

package p2.v3;

/*模拟夫妻提款的操作，未使用同步*/
public class HusbandAndWifeStory {
public static void main(String[] args) {
BankAccount bankAccount = new BankAccount(3000);
WithDraw withdraw = new WithDraw(bankAccount);
Thread husband = new Thread(withdraw);
Thread wife = new Thread(withdraw);
husband.setName("HUSBAND");
wife.setName("    WIFE");
husband.start();
wife.start();
System.out.println("最后银行账户还剩："+bankAccount.getBalance());

}

}

class BankAccount {
private int balance;
public BankAccount(int balance) {
this.balance=balance;
}

// 查询余额
public int getBalance() {
return balance;
}

// 取款
public void withdraw(int amount) {

balance = balance - amount;

}
}

class WithDraw implements Runnable {
private BankAccount account;

public WithDraw(BankAccount account) {
this.account = account;

}

@Override
public void run() {//

withdDraw();//
}
private synchronized void withdDraw(){//
System.out.println(Thread.currentThread().getName()+"得到了账户的控制权——开始");//
if (account.getBalance() < 2000) {
System.out.println(Thread.currentThread().getName()
+ "在查询时，钱透支了，不够了");
} else {
System.out.println(Thread.currentThread().getName()+"在查询时，余额为"+account.getBalance());
System.out.println(Thread.currentThread().getName()
+ "准备从账户上取走2000");
try {
System.out.println(Thread.currentThread().getName()
+ "准备休息");
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(Thread.currentThread().getName() + "醒来");
account.withdraw(2000);
System.out.println(Thread.currentThread().getName() + "完成提款");
System.out.println("现在账户上还剩" + account.getBalance() + "元");
}
System.out.println(Thread.currentThread().getName()+"释放了账户的控制权——结束");
}
}