java 多线程 day06 threadLocal

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

/**
 * Created by chengtao on 17/12/3.
 *  继5 之后，ThreadLocal就是系统为我们提供的那个map
 */
public class Thread0601_ThreadLocal {

    private static int data = 0;
    private static  ThreadLocal<Integer> threadLocalData = 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()
                            + " has put data :" + data);
                    threadLocalData.set(data);
                    new Thread0601_ThreadLocal.A().get();
                    new Thread0601_ThreadLocal.B().get();
                }
            }).start();
        }
    }

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

    static class B{
        public void get(){
            int data = threadLocalData.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.
 * 继6.1 之后，如果共享多个变量？如何隐藏 ThreadLocal 类？
 */
public class Thread0602_ThreadLocal {

    private static ThreadLocal<Integer> x = new ThreadLocal<Integer>();
    private static ThreadLocal<MyThreadScopeData> myThreadScopeData = new ThreadLocal<MyThreadScopeData>();
    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);
                    x.set(data);
/*             MyThreadScopeData myData = new MyThreadScopeData();
               myData.setName("name" + data);
               myData.setAge(data);
               myThreadScopeData.set(myData);*/
                    MyThreadScopeData.getThreadInstance().setName("name" + data);
                    MyThreadScopeData.getThreadInstance().setAge(data);
                    new A().get();
                    new B().get();
                }
            }).start();
        }
    }

    static class A{
        public void get(){
            int data = x.get();
            System.out.println("A from " + Thread.currentThread().getName()
                    + " get data :" + data);
/*       MyThreadScopeData myData = myThreadScopeData.get();;
         System.out.println("A from " + Thread.currentThread().getName()
               + " getMyData: " + myData.getName() + "," +
               myData.getAge());*/
            MyThreadScopeData myData = MyThreadScopeData.getThreadInstance();
            System.out.println("A from " + Thread.currentThread().getName()
                    + " getMyData: " + myData.getName() + "," +
                    myData.getAge());
        }
    }

    static class B{
        public void get(){
            int data = x.get();
            System.out.println("B from " + Thread.currentThread().getName()
                    + " get data :" + data);
            MyThreadScopeData myData = MyThreadScopeData.getThreadInstance();
            System.out.println("B from " + Thread.currentThread().getName()
                    + " getMyData: " + myData.getName() + "," +
                    myData.getAge());
        }
    }
}

class MyThreadScopeData{
    private MyThreadScopeData(){}
    public static /*synchronized*/ MyThreadScopeData getThreadInstance(){
        MyThreadScopeData instance = map.get();
        if(instance == null){
            instance = new MyThreadScopeData();
            map.set(instance);
        }
        return instance;
    }
    //private static MyThreadScopeData instance = null;//new MyThreadScopeData();
    private static ThreadLocal<MyThreadScopeData> map = new ThreadLocal<MyThreadScopeData>();

    private String name;
    private int age;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
}