java 多线程 day05 线程范围内的数据共享

Posted 2020-10-16 为爱奋斗不息

import java.util.HashMap;
import java.util.Map;
import java.util.Random;
/**
 * Created by chengtao on 17/12/3.
 * 线程范围内的数据共享：即模块从不同的线程获取到的值是不一样的
 * 可以通过 hashMap<thread,data> 来将线程和对应的值通过map来区分
 */

public class Thread0501_ThreadScopeShareData {

    private static int data = 0;
    public static void main(String[] args) {
        for(int i=0;i<2;i++){
            new Thread(new Runnable(){
                public void run() {
                    data = new Random().nextInt();
                    System.out.println(Thread.currentThread().getName()
                            + " has put data :" + data);
                    new A().get();
                    new B().get();
                }
            }).start();
        }
    }

    static class A{
        public void get(){
            System.out.println("A from " + Thread.currentThread().getName() + " get data :" + data);
        }
    }

    static class B{
        public void get(){
            System.out.println("B from " + Thread.currentThread().getName() + " get data :" + data);
        }
    }
}




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import java.util.HashMap;
import java.util.Map;
import java.util.Random;

/**
 * Created by chengtao on 17/12/3.
 * 线程间的数据共享
 */



public class Thread0502_ThreadScopeShareData {

    private static int data = 0;
    private static Map<Thread, Integer> threadData = new HashMap<Thread, 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()
                            + " has put data :" + data);
                    threadData.put(Thread.currentThread(), data);
                    new A().get();
                    new B().get();
                }
            }).start();
        }
    }

    static class A{
        public void get(){
            int data = threadData.get(Thread.currentThread());
            System.out.println("A from " + Thread.currentThread().getName()
                    + " get data :" + data);
        }
    }

    static class B{
        public void get(){
            int data = threadData.get(Thread.currentThread());
            System.out.println("B from " + Thread.currentThread().getName()
                    + " get data :" + data);
        }
    }
}