异常作业

   今天做的是“异常‘。

    

package aaa;
import java.util.Scanner;

public class bbb {
public static void main(String[] args) {
 int a=0;
 int b=0;
 Scanner sc=new Scanner(System.in);
 try {
  System.out.println("请输入被除数：");
  a=sc.nextInt();
  System.out.println("请输入除数：");
  b=sc.nextInt();
 }catch(Exception e)
 {
  System.out.println("输入不合法：");
  e.printStackTrace();
 }
 finally {
 if(b==0) {
  System.out.println("b的值不能为0");
 }
 else {
  System.out.println(a+"/"+b+"="+(a/b));
 }
}
}
}

 

package aaa;
import java.util.Scanner;
public class Circle {
public static void main(String[] args) {
 double r;
 Scanner s=new Scanner(System.in);
 try {
  r=Double.parseDouble(s.next());
  System.out.println("面积是"+3.14*r*r);
 }
 catch(Exception e) {
  e.printStackTrace();
 }
 finally {
  r=Double.parseDouble(s.next());
  System.out.println("面积是"+3.14*r*r);
 }
}
}

package aaa;
 import java.util.Scanner;
 public class Excep {
 static String id;      
 public void length(String id) throws IllegalArgumentException{
     if (id.length() == 18) { 
              this.id = id;
             System.out.println("身份证号长度正常");
 }                           
    else{
         throw new IllegalArgumentException("身份证号长度异常");                          
     }
 }
 public static void main(String[] args) {
       Scanner sc=new Scanner(System.in);
       Excep A=new Excep();
 try {
            System.out.println("请输入身份证号：");
             A.id=sc.next();
            A.length(A.id);
 } catch (IllegalArgumentException e) {
         System.out.println("异常");
    
                System.out.println(e.getMessage());
 }finally{
             System.out.println("身份证号码为:"+id);
     }
     }
 }