System的exit

源码

 /**     * Terminates the currently running Java Virtual Machine. The     * argument serves as a status code; by convention, a nonzero status     * code indicates abnormal termination.     * <p>     * This method calls the <code>exit</code> method in class     * <code>Runtime</code>. This method never returns normally.     * <p>     * The call <code>System.exit(n)</code> is effectively equivalent to     * the call:     * <blockquote><pre>     * Runtime.getRuntime().exit(n)     * </pre></blockquote>     *     * @param      status   exit status.     * @throws  SecurityException     *        if a security manager exists and its <code>checkExit</code>     *        method doesn't allow exit with the specified status.     * @see        java.lang.Runtime#exit(int)     */    public static void exit(int status) {        Runtime.getRuntime().exit(status);    }

功 能: 关闭所有文件，终止正在执行的进程。

exit（0）：正常运行程序并退出程序；

exit（1）：非正常运行导致退出程序；

测试方法：

 // 测试方法    public static void main(String[] args) {        StackType stackType = new StackType();        try {            DATA3 data3 = stackType.PopST(stackType); // 此处调用了 exit 直接关闭了当前现成 之后方法都未执行        }catch (Exception ee){            System.out.printf("sss");        }    }    DATA3 PopST(StackType s){        if(s.top==0){            System.out.printf("栈为空！");            System.exit(0);            System.out.printf("关闭后"); //永远不会执行        }        return (s.data[s.top--]);    }

控制台输出

Connected to the target VM, address: '127.0.0.1:52564', transport: 'socket'Disconnected from the target VM, address: '127.0.0.1:52564', transport: 'socket'栈为空！Process finished with exit code 0