Java基础--异常--自定义异常
用于处理项目中可能会出现的特有的问题,对这些问题进行自定义的异常封装。
ExceptionTest.java
public class ExceptionTest { public static void main(String[] args){ DivDemo dd = new DivDemo(); int resultD; try { resultD = dd.div(10, -1); System.out.println("resultD' value is :"+resultD); } catch (ArithmeticException e){ System.out.println("Arithmetic异常: "+e.toString()); } catch (FuShuException e){ System.out.println("FuShu异常: "+e.toString()); System.out.println("负数为:"+e.value); } System.out.println("over!"); } } //创建自定义异常类---继承Exception,才有了可抛性,这个可抛性是throwable体系具有的。 class FuShuException extends Exception{ int value; FuShuException(){ super(); } //异常信息message FuShuException(String msg,int val){ super(msg); this.value = val; } public int getValue(){ return this.value; } } class DivDemo{ public int div(int a,int b) throws ArithmeticException,FuShuException{ if(a < 0 ){ throw new FuShuException("出现了负数",a); //主动抛FuShuException异常 } if(b < 0 ){ throw new FuShuException("出现了负数",b); //主动抛FuShuException异常 } return a/b; } }
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