java - java SecurityManager checkPermission(Permission perm) 的异常处理问题

Question

为什么这不会用 try catch 或 throw from mathod 来包围？

import java.security.Permission;

public class NewSecurityManager extends SecurityManager{

    public void checkPermission(Permission perm) {
        throw new SecurityException("You are drunk. Please go home!");
    }

}

Answer 1

SecurityManager 扩展了 RuntimeException ，导致它成为 unchecked exception 。未经检查的异常不需要封闭 try/catch block ，也不需要从包含的方法中重新抛出异常。