每個執行緒單獨一份資料ThreadLocal

import java.util.Random;

public class D {
//	public static ThreadLocal<Integer> map=new ThreadLocal<Integer>();
	
	public static void main(String[] args) {
		for(int i=0;i<2;i++) {
		new Thread(
				new Runnable() {
					public void run() {
						int data=new Random().nextInt();
						System.out.println(Thread.currentThread().getName()+":"+data);
//						map.set(data);
//						
						ThreadData.getThreadInstance().setAge(data);
						ThreadData.getThreadInstance().setName(data);
						new DD().a();
						new DD().b();
					}
				}
				).start();
		}
	}
	
	static class DD{
		public void a() {
//			Integer a = map.get();
			ThreadData instance = ThreadData.getThreadInstance();
			System.out.println(Thread.currentThread().getName()+
					"--A--name:"+instance.getName()+
					"--age:"+instance.getAge());
		}
		
		public void b() {
//			Integer b = map.get();
			ThreadData instance = ThreadData.getThreadInstance();
			System.out.println(Thread.currentThread().getName()+
					"--B--name:"+instance.getName()+
					"--age:"+instance.getAge());
		}
	}
}

class ThreadData{
	public static ThreadLocal<ThreadData> threadMap=new ThreadLocal<ThreadData>();
	
	private ThreadData() {}
	public static ThreadData getThreadInstance() {
		ThreadData threadData = threadMap.get();
		if(threadData==null) {
			 threadData=new ThreadData();
			 threadMap.set(threadData);
		}
		return threadData;
	}
	
	private int name;
	private int age;
	public int getName() {
		return name;
	}
	public void setName(int name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	
}