学习笔记4

1，三大语句

 

 

 

break语句

break用于while循环里，通常用来跳出循环；

 

contiune语句

用来终结循环；

 

returm语句

 

 

break,continue结合语句

 

 

实题演练：

package manager;

import java.util.Scanner;

public class d1 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        
        Scanner input = new Scanner(System.in);
        int choice;
        String name;
        do{ 
            System.out.println("-------欢迎使用miniDVD------");
            System.out.println("-------------------------");
            System.out.println("----------功能选项----------");
        
       choice = input.nextInt();
       switch(choice){
        case 1 :
            System.out.println("新增DVD");
            System.out.println("请输入你需要新增DVD的名称");
            name = input.next();
            System.out.println("新增《"+name+"》成功");
            
            do{
                System.out.println("输入0返回");
                choice = input.nextInt();
            }while(choice!=0);
            break;
        case 2 :
            System.out.println("查看DVD");
            do{
                System.out.println("输入0返回");
                choice = input.nextInt();
            }while(choice!=0);
            break;
        case 3:
            System.out.println("删除DVD");
            System.out.println("请输入你删除的DVD名称");
            name = input.next();
            System.out.println("删除《"+name+"》成功");
            do{
                System.out.println("输入0返回");
                choice = input.nextInt();
            }while(choice!=0);
            break;
        case 4:
            System.out.println("借出DVD");
            System.out.println("请输入你借出的DVD名称");
            name = input.next();
            System.out.println("借出《"+name+"》成功");
            do{
                System.out.println("输入0返回");
                choice = input.nextInt();
            }while(choice!=0);
            break;
        case 5:
            System.out.println("归还DVD");
            System.out.println("请输入归还DVD名称");
            name = input.next();
            System.out.println("归还《"+name+"》成功");
            do{
                System.out.println("输入0返回");
                choice = input.nextInt();
            }while(choice!=0);
            break;
        case 6:
            System.out.println("退出系统");
            
            break;
        default:
            System.out.println("输入错误");
            
            };
            
        
       }while(true);

         
    }

}