异常

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import java.util.Scanner;  public class Divider {public static void main(String[] args) {  int oper1 = 0;      int oper2 = 0;      Scanner in = new Scanner(System.in);      try    {    System.out.print("请输入除数:");              oper1 = in.nextInt();              System.out.print("请输入被除数:");              oper2 = in.nextInt();              System.out.println("计算结果：" + oper2/oper1);    }    catch (ArithmeticException e1)     {              System.out.println("异常1:除数不能为零!");     }    catch (NumberFormatException e2)    {    System.out.println("异常2:数字格式错误!");     }    catch (Exception e3)    {    System.out.println("其他异常3:"+e3.getMessage());    }}}

import java.util.Scanner;public class Divider2 {public static void main(String[] args) {  double oper1,oper2;      Scanner in = new Scanner(System.in);      System.out.print("请输入你想执行的次数:");    int n=in.nextInt();    for(int i=0;i<n;i++)    {    try    {    System.out.print("请输入除数:");              oper1 = in.nextDouble();              System.out.print("请输入被除数:");              oper2 = in.nextDouble();            double ans=oper2/oper1;            System.out.println("计算结果：" + ans);    }    catch (ArithmeticException e1)     {              System.out.println("异常1:除数不能为零!");     }    catch (NumberFormatException e2)    {    System.out.println("异常2:数字格式错误!");     }    catch (Exception e3)    {    System.out.println("其他异常3:"+e3.getMessage());    }    }}}

class MyException extends Exception{public String toString(){ return "异常1:除数等于零";}}public class Divider3{static double avg(double number1,double number2) throws MyException{double eps=1e-7;if(number2-0<=eps){throw new MyException();}return number1/number2;}public static void main(String[] args) {  double oper1,oper2;    Scanner in = new Scanner(System.in);      System.out.print("请输入你想执行的次数:");    int n=in.nextInt();    for(int i=0;i<n;i++)    {    try    {    System.out.print("请输入除数:");              oper1 = in.nextDouble();              System.out.print("请输入被除数:");              oper2 = in.nextDouble();            double ans=avg(oper2,oper1);            System.out.println("计算结果：" + ans);    }    catch (NumberFormatException e2)    {    System.out.println("异常2:数字格式错误!");     }    catch (MyException e)    {    System.out.println(e.toString());    }    catch (Exception e3)    {    System.out.println("其他异常3:"+e3.getMessage());    }    }}}

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