
package geym.conc.ch2.notsafe;

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

/**
 * use JDK 7
 * JDK 8不会死循环，只会数据不一致
 * @author Geym
 *
 */
public class HashMapMultiThread {

    static Map<String,String> map = new HashMap<String,String>();

    public static class AddThread implements Runnable {
        int start=0;
        public AddThread(int start){
            this.start=start;
        }
        @Override
        public void run() {
            for (int i = start; i < 100000; i+=2) {
                map.put(Integer.toString(i), Integer.toBinaryString(i));
            }
        }
    }

    public static void main(String[] args) throws InterruptedException {
        Thread t1=new Thread(new HashMapMultiThread.AddThread(0));
        Thread t2=new Thread(new HashMapMultiThread.AddThread(1));
        t1.start();
        t2.start();
        t1.join();t2.join();
        System.out.println(map.size());
    }
}
