实训SI

package bbb;

import java.util.Scanner;

public class ccc {
    public static void main(String [] argc){
        int x,y,num;
        Scanner in = new Scanner(System.in);
        System.out.print("请输入两个数据:");
        x = in.nextInt();
        y = in.nextInt();
        try{
            num=x/y;
        }catch(Exception e){
            e.printStackTrace();
            System.out.println("除数不能为零");
        }
        finally{            
            System.out.println();
        }
    }

}

package bbb;

import java.util.Scanner;

public class nida {

    public static void main(String[] args) {
        // TODO 自动生成的方法存根
        double r,num;
        System.out.print("请输入圆的半径：");
        Scanner in = new Scanner(System.in);
        r = in.nextDouble();
        try{
                num = 3.14*r*r;
                System.out.println(num);
        }catch(Exception e){
            e.printStackTrace();
        }                    
    }

}

package bbb;

import java.util.Scanner;

public class Myexcep extends Exception{
    public Myexcep(String ErrorMessage){
        super(ErrorMessage);
    }
public class Tran{
    String avg(String s) throws Myexcep{
        if(s.length()!=18){
            throw new Myexcep("不是18个数字");
        }
        return s;
    }
}
    public static void main(String[] args) {
        // TODO 自动生成的方法存根
         String id;
         System.out.print("请输入身份证号码：");
         Scanner in = new Scanner(System.in);
         id =in.nextLine();
         try{
             //System.out.print("身份证号码为：");
             System.out.print(avg(id));
         }catch(Exception e){
             //e.printStackTrace();
             System.out.println(e);
         }
    }
    private static String avg(String id) throws Myexcep {
        String s = id;
        // TODO 自动生成的方法存根
        if(s.length()!=18){
            throw new Myexcep("不是18个数字");
        }
        System.out.print("身份证号码为：");
        return s;
    }
    
}