Synchronize

儘量，不要使用String常量加鎖
會出現死迴圈問題

new String
可以使用new String加鎖

package com.bjsxt.base.sync006;

/**
 * synchronized程式碼塊對字串的鎖，注意String常量池的快取功能
 *
 */
public class StringLock {

    public void method() {
        // new String("字串常量")
        synchronized (new String("字串常量")) {
            try {
                while
 
 (true) {
                    System.out.println("當前執行緒 : " + Thread.currentThread().getName() + "開始");
                    Thread.sleep(1000);
                    System.out.println("當前執行緒 : " + Thread.currentThread().getName() + "結束");
                }
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    public
 
 static void main(String[] args) {
        final StringLock stringLock = new StringLock();
        Thread t1 = new Thread(new Runnable() {
            @Override
            public void run() {
                stringLock.method();
            }
        }, "t1");
        Thread t2 = new Thread(new Runnable() {
            @Override
 

            public void run() {
                stringLock.method();
            }
        }, "t2");

        t1.start();
        t2.start();
    }
}

執行