千峰逆战班，Day27

在千峰“逆战班”学习的第27天
今天的学习内容是对异常中的自定义异常、带有异常声明的方法覆盖以及对异常的一些知识扩充
中国加油！武汉加油！千峰加油！我自己加油！！！

作业：
5.

public class Test {
	public static void main(String[] args){
		int n = 3;
		try{
			if(n % 2 == 0){
				m1();
			}else{
				m2();
			}
		}catch(MyException2 e){
			System.err.println(e.getMessage());
		}catch(MyException1 e){
			System.err.println(e.getMessage());
		}
	}
	public static void m1(){
		throw new MyException2("haha");
	}
	public static void m2() throws MyException1{
		throw new MyException1("hehe");
	}
}
class MyException1 extends Exception{
	public MyException1(){}
	public MyException1(String message){
		super(message);
	}
}
class MyException2 extends RuntimeException{
	public MyException2(){}
	public MyException2(String message){
		super(message);
	}
}

public class Test {
	public static void main(String[] args){
		int n = 2;
		try{
			m(n);
		}catch(MyException1 ex1){
			ex1.printStackTrace();
		}catch(MyException2 ex2){
			System.err.println(ex2.getMessage());
			throw ex2;
		}
	}
	public static void m(int n) throws MyException1{
		if(n == 1){
			throw new MyException1("n == 1");
		}else{
			throw new MyException2("n == 2");
		}
	}
	
}
class MyException1 extends Exception{
	public MyException1(){}
	public MyException1(String message){
		super(message);
	}
}
class MyException2 extends RuntimeException{
	public MyException2(){}
	public MyException2(String message){
		super(message);
	}
}

8.AB D
12.不能通过
MySub2中的m()方法抛出的异常不能比父类中的m()方法抛出的异常更宽泛，应该把FileNotFoundException更改为EOFException或者其子类