线程的同步

先看线程不同步的情况：

//数据类
package com.itjob;

public class Person {
	private String name = "王非";
	private String sex = "女";	
	
	public void put(String name, String sex)
	{			
		this.name = name;		
		this.sex = sex;		
	}
	
	public void get()
	{		
		System.out.println(name + "----->" + sex);
	}	
}

//用来显示Person数据
package com.itjob;
public class Consumer implements Runnable {
	Person person;
	
	public Consumer(Person person)
	{
		this.person = person;
	}

	public void run() {
		while(true)
		{
			person.get();
		}		
	}
}

//用来修改Person数据
package com.itjob;
public class Producer implements Runnable {	
	Person person;
	
	public Producer(Person person)
	{
		this.person = person;
	}
	
	public void run()
	{
		int i = 0;
		while(true)
		{			
				if(i==0)
				{
					person.put("刘祥", "男");					
				}else{
					person.put("王非", "女");					
				}			
			i = (i+1)%2;
		}
	}
}
//主程序类
package com.itjob;
public class ThreadCom {
	public static void main(String[] args)
	{
		Person person = new Person();
		new Thread(new Producer(person)).start();
		new Thread(new Consumer(person)).start();
	}
}

 运行的结果如图：

修改为线程同步

只需要修改Person类就OK了，同步只是对数据加锁，与线程无关，当多个线程访问同一个数据的时候，就要对数据加锁（同步）

修改后的代码如：

//数据类
package com.itjob;
public class Person {
	private String name = "王非";
	private String sex = "女";	
	
	public synchronized void put(String name, String sex)
	{			
		this.name = name;		
		this.sex = sex;		
	}
	
	public synchronized void get()
	{		
		System.out.println(name + "----->" + sex);
	}	
}

 运行的结果不会有男女不分的情况！