线程同步（一）

线程同步（一）

/**
 * 采用两个线程共享同一个数据对象的方式对同一数据进行操作
 */

package com.starain.threaddemo;
public class TongBu {
    public static void main(String[] args) {
        Tickets ticket = new Tickets(20);
        InPut input = new InPut(ticket);
        OutPut output = new OutPut(ticket);
        input.start();
        output.start();
    }
}
class Tickets{//票类
    int number;//票编号
    int size;//票的总数量
    int i;//出票次数
    boolean available = true;
    public Tickets(int size){
        this.size = size;
    }
}
class InPut extends Thread{
    Tickets ticket;
    public InPut(Tickets ticket){
        this.ticket = ticket;
    }
    public void run(){
        while(ticket.number<ticket.size){
            System.out.println("input the"+(++ticket.number)+"ticket");
            ticket.available = true;
        }
    }
}
class OutPut extends Thread{
    Tickets ticket;
    public OutPut(Tickets ticket){
        this.ticket = ticket;
    }
    public void run(){
        while(ticket.i<ticket.size){
            if(ticket.available==true&&ticket.i<ticket.size){
                System.out.println("  output the"+(++ticket.i)+"ticket");
            }
            if(ticket.i==ticket.number){
                ticket.available = false;
            }
        }
    }
}

解决方法就是用synchronize进行同步

/**
 * 采用两个线程共享同一个数据对象的方式对同一数据进行操作
 */

package com.starain.threaddemo;
public class TongBu {
    public static void main(String[] args) {
        Tickets ticket = new Tickets(20);
        InPut input = new InPut(ticket);
        OutPut output = new OutPut(ticket);
        input.start();
        output.start();
    }
}
class Tickets{//票类
    int number;//票编号
    int size;//票的总数量
    int i;//出票次数
    boolean available = true;
    public Tickets(int size){
        this.size = size;
    }
}
class InPut extends Thread{
    Tickets ticket;
    public InPut(Tickets ticket){
        this.ticket = ticket;
    }
    public void run(){
        synchronized(ticket){
        while(ticket.number<ticket.size){
            System.out.println("input the"+(++ticket.number)+"ticket");
            ticket.available = true;
            }
        }
    }
}
class OutPut extends Thread{
    Tickets ticket;
    public OutPut(Tickets ticket){
        this.ticket = ticket;
    }
    public void run(){
        while(ticket.i<ticket.size){
            
            synchronized(ticket){
            
            if(ticket.available==true&&ticket.i<ticket.size){
                System.out.println("  output the"+(++ticket.i)+"ticket");
            }
            if(ticket.i==ticket.number){
                ticket.available = false;
            }
            }
            
        }
    }
}