1、創建死鎖

package lao.ben.juc.deadLock;

import org.junit.Test;

//死鎖條件：兩個執行緒互相持有對方想要的鎖，對方又釋放不了，就卡住了，
public class DeadLock {

    //方法一
    String xiaowang = "xiaownag";
    String xiaohong = "xiaohong";

    public void together1() throws Exception {
        synchronized (xiaowang) {
        	//執行緒安全問題就是執行緒之間打了個時間差，
        	//業務代碼執行時間越長，越容易產生執行緒安全問題，
            Thread.sleep(100);
            synchronized (xiaohong) {
                System.out.println("together1執行了");
            }
        }
    }

    public void together2() throws Exception {
        synchronized (xiaohong) {
            Thread.sleep(100);
            synchronized (xiaowang) {
                System.out.println("together2執行了");
            }
        }
    }
}

2、創建執行緒任務類

package lao.ben.juc.deadLock;

public class Thread1 extends Thread {

    private DeadLock deadLock;

    public Thread1(DeadLock dl) {
        this.deadLock = dl;
    }

    public void run() {
        try {
            deadLock.together1();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

package lao.ben.juc.deadLock;

public class Thread2 extends Thread {

    private DeadLock deadLock;

    public Thread2(DeadLock dl) {
        this.deadLock = dl;
    }

    public void run() {
        try {
            deadLock.together2();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}