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  • 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);
    }
    }
    }

    ----------------------------------------
    ----------------------------------------
    ----------------------------------------
    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;
    }
    }

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  • 原文地址:https://www.cnblogs.com/ctaixw/p/7967798.html
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