JAVA 异常处理练习

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//仅作为学习笔记

/* 异常练习1*/class NoValueException extends Exception{NoValueException(String msg){super(msg);}}interface Shape{void getArea();}class Rec implements Shape{private int len , wid;Rec(int len , int wid) throws NoValueException{if( len <= 0 || wid <= 0)throw new NoValueException("出现非法值！");this.len = len;this.wid = wid;}public void getArea(){System.out.println(len*wid);}}class ExceptionTest{public static void main(String [] args){try{Rec r = new Rec(-3,4);r.getArea();}catch ( NoValueException e){System.out.println(e.toString());}System.out.println("Over");}}

/* 异常练习2*/class NoValueException extends RuntimeException{NoValueException(String msg){super(msg);}}interface Shape{void getArea();}class Rec implements Shape{private int len , wid;Rec(int len , int wid) //throws NoValueException{if( len <= 0 || wid <= 0)throw new NoValueException("出现非法值！");this.len = len;this.wid = wid;}public void getArea(){System.out.println(len*wid);}}class ExceptionTest{public static void main(String [] args){Rec r = new Rec(-3,4);r.getArea();System.out.println("Over");}}