自定义异常

package Zuoye;

import java.io.EOFException;

public class YIchang {
public int say(int num, int num1) throws Exception {
if (num < num1) {
throw new Exception("被减数不能小于件数");
}
return num - num1;
}

public int sa(int num, int num1) throws Exception {

if (num == 0) {
throw new Exception("被除数不能为0");

}
return num / num1;
}
public int sda(int num,int num1)throws Exception{
if(num==0){
throw new Exception("乘数不能为0");
}
return num1*num;

}
}

package Zuoye;

import org.apache.log4j.Logger;

public class Test {
private static Logger logger = Logger.getLogger(Test.class);
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
YIchang c=new YIchang ();

try{int s=c.say(10, 55);
System.out.println("你要求的值是"+s);
}catch(Exception e){
System.out.println(e.getMessage());
logger.warn(e.getMessage());
}
try{
int t =c.sa(0, 5);
System.out.println("你要求的值是"+t);
}catch(Exception e){
System.out.println(e.getMessage());
logger.error(e.getMessage());
}
try{
int i= c.sda(0, 3);
System.out.println("你要求的值是"+i);
}catch(Exception e){
System.out.println(e.getMessage());
logger.warn(e.getMessage());
}

}

}