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;    }}