?? throwexception.java
字號:
public class ThrowException
{ static double sqrt(double d) throws IllegalArgumentException
{ if(d<0)
{ IllegalArgumentException e=new IllegalArgumentException("不能對負數開平方");
throw e;
}
return (Math.sqrt(d));
}
public static void main(String args[ ])
{ System.out.println("IllegalArgumentException Demo");
try
{ System.out.println(sqrt(9));
System.out.println(sqrt(-3));
}
catch(IllegalArgumentException e)
{ System.out.println(e.getMessage( ));
}
}
}
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