循环结构

 1 package chapter9;
 2 
 3 import java.util.Scanner;
 4 
 5 public class class03 {
 6     public static void main(String[] args){
 7         Scanner input=new Scanner(System.in);
 8         int count=0;
 9         for(int i=0;i<5;i++){
10             System.out.println("欢迎光临第"+(i+1)+"家店");
11             for(int j=0;j<3;j++){
12                 System.out.print("要离开吗(y/n)?");
13                 String str=input.next();
14                 if(str.equals("y")){
15                     break;
16                 }
17                 count++;
18                 System.out.println("买了一件衣服");
19             }
20             System.out.println("离店结账\n");
21         }
22         System.out.println("总共买了:"+count+"件");
23     }
24 }

 1 package chapter9;
 2 
 3 import java.util.Scanner;
 4 
 5 public class class02 {
 6     public static void main(String[] args){
 7         Scanner input=new Scanner(System.in);
 8         double avg=0;
 9         int count=0;
10         for(int k=0;k<3;k++){
11             double sum=0;
12             System.out.println("第"+(k+1)+"个班级的成绩");
13             for(int i=0;i<4;i++){
14                 System.out.print("请输入第"+(i+1)+"个成绩：");
15                 int score=input.nextInt();
16                 sum=sum+score;
17                 if(score<85){
18                     continue;
19                 }
20                 count++;
21             }
22             avg=sum/4;
23             System.out.println("平均分："+avg+"\n");
24         }
25         System.out.println("成绩85分以上的学员人数有"+count+"人");
26     }
27 }