try-catch 示例

package unit5;

import java.util.Scanner;

import javax.print.CancelablePrintJob;
import javax.sound.midi.SysexMessage;

import unit4.interfacedemo;

public class Trycatchdemo {
    public static void main(String[] args) {
        int a=0,b=0,c=0;
        try {
            a=Integer.parseInt(args[0]);
            b=Integer.parseInt(args[1]);
            c=a/b;
            System.out.println("c="+c);
            System.out.println("**正常执行");
            System.out.println("实数除法不产生数学类异常：3.0/0.0"+(3.0/0.0));
        } catch (ArrayIndexOutOfBoundsException e1) {
            System.out.println("此程序需要两个参数!");
        }catch (NumberFormatException  e2) {
            System.out.println("必须要有数字");
        }catch (ArithmeticException e3) {

            System.out.println("除数不能为零");
            System.out.println("请重新输入参数");
            Scanner in = new Scanner(System.in);
            b=in.nextInt();
            c=a/b;
            System.out.println("c="+c);
        }
    }

}