java安全退出程序------关闭钩子

测试代码：

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public class TestHook {

public static boolean hookFlag = false;

public static void main(String[] args) {
	
	Thread shutDownThread = new Thread() {
		public void run() {
			TestHook.hookFlag = true;
			try {
				Thread.sleep(5000);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
			System.out.println("hook success!"+TestHook.hookFlag);
		}
	};
	Runtime.getRuntime().addShutdownHook(shutDownThread);
	System.out.println("hook init" + TestHook.hookFlag);
	while(!TestHook.hookFlag) {
		try {
			Thread.sleep(1000);
			System.out.println("没安全退出");
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	System.out.println("安全退出");
}

}

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执行命令 kill [pid]

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运行结果：