Java异常处理与继承机制-优快云博客

本文链接：https://blog.youkuaiyun.com/Fish_Xx/article/details/104781340

本文探讨了Java中自定义异常的创建与使用，通过两个示例类MyException1和MyException2，分别演示了检查型异常和运行时异常的抛出与捕获。同时，文章还展示了异常消息的传递及异常的再抛出过程。此外，文中还讨论了异常处理中的继承关系，特别是在不同子类中异常声明的变化。

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5

class MyException1 extends Exception{
	public MyException1(){}
	public MyException1(String message){
		super(message);
	}
}
class MyException2 extends RuntimeException{
	public MyException2(){}
	public MyException2(String message){
		super(message);
	}
}

6

public class TestMyException {

	public static void main(String[] args) {
		int n;
		n = 0;
		try{
			m(n);
		}catch(MyException1 ex1){
			ex1.printStackTrace();
		}catch(MyException2 ex2){
			System.out.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

10

	100  100

12

class MySuper{
	public void m() throws IOException{}
}

class MySub extends MySuper{
	public void m() throws EOFException, FileNotFoundException{}
	
}
class MySub2 extends MySub{
	public void m() throws FileNotFoundException{}
	
}