9.18日课堂上java练习

  1 import java.util.ArrayList;
  2 import java.util.Random;
  3 import java.util.Scanner;
  4 import java.util.ArrayList;
  5 import java.util.Random;
  6 import java.util.Scanner;
  7 
  8 public class CountdownThread extends Thread {
  9     private static int seconds;
 10     private static int count=0;
 11 
 12     public CountdownThread(int seconds) {
 13         this.seconds = seconds;
 14     }
 15 
 16     @Override
 17     public void run() {
 18         try {
 19             while (seconds > 0) {
 20                 Thread.sleep(1000);
 21                 seconds--;
 22             }
 23             System.out.println("倒计时结束！");
 24             System.out.println("正确个数为："+count+" 准确率为："+count/(float)30);
 25             System.exit(0);
 26         } catch (InterruptedException e) {
 27             e.printStackTrace();
 28         }
 29     }
 30 
 31     public static void main(String[] args) {
 32         Scanner sc =new Scanner(System.in);
 33         System.out.print("请输入时间：");
 34         seconds=sc.nextInt();
 35         CountdownThread thread = new CountdownThread(seconds);
 36         thread.start();
 37         ArrayList<data> list = new ArrayList<>();
 38         Input(list);
 39         print(list);
 40     }
 41 
 42         //添加数据
 43         public static void Input(ArrayList<data> list){
 44             int flag=0;
 45             while (flag<=30){
 46                 Random r=new Random();
 47                 int data1=r.nextInt(100);
 48                 int data2=r.nextInt(100);
 49                 int number=r.nextInt(100)%4;
 50                 data d=new data(data1,number,data2);
 51                 switch (number){
 52                     case 0:{
 53                         if(!check(list,data1,number,data2)){
 54                             break;
 55                         }
 56                         list.add(d);
 57                         flag++;
 58                         break;
 59                     }
 60                     case 1:{
 61                         if(!check(list,data1,number,data2)){
 62                             break;
 63                         }
 64                         int result=data1-data2;
 65                         if(result>=0){
 66                             list.add(d);
 67                             flag++;
 68                         }
 69                         break;
 70                     }
 71                     case 2:{
 72                         if(!check(list,data1,number,data2)){
 73                             break;
 74                         }
 75                         int result=data1*data2;
 76                         if(result<1000){
 77                             list.add(d);
 78                             flag++;
 79                         }
 80                         break;
 81                     }
 82                     case 3:{
 83                         if(!check(list,data1,number,data2)){
 84                             break;
 85                         }
 86                         int result = data1 % data2;
 87                         if(result==0 && data1>data2){
 88                             list.add(d);
 89                             flag++;
 90                         }
 91                         break;
 92                     }
 93                 }
 94             }
 95         }
 96         //判断数据是否重复
 97         public static boolean check(ArrayList<data> list,int data1,int number,int data2){
 98             for (int i = 0; i < list.size(); i++) {
 99                 data d=list.get(i);
100                 int a=d.getData1();
101                 int b=d.getData2();
102                 int c=d.getData3();
103                 if((a==data1)&&(b==number)&&(c==data2)){
104                     return false;
105                 }
106             }
107             return true;
108         }
109         //打印数据
110         public static void print(ArrayList<data> list){
111             Scanner sc=new Scanner(System.in);
112 
113             for (int i = 0; i < list.size(); i++) {
114                 data d=list.get(i);
115                 if(d.getData2()==0){
116                     int number,result;
117                     System.out.print(d.getData1()+"+"+d.getData3()+"=");
118                     number=sc.nextInt();
119                     result=d.getData1()+d.getData3();
120                     if(number==result){
121                         count++;
122                     }
123                     System.out.println("剩余时间："+seconds);
124                 }
125                 if(d.getData2()==1){
126                     int number,result;
127                     System.out.print(d.getData1()+"-"+d.getData3()+"=");
128                     number=sc.nextInt();
129                     result=d.getData1()-d.getData3();
130                     if(number==result){
131                         count++;
132                     }
133                     System.out.println("剩余时间："+seconds);
134                 }
135                 if(d.getData2()==2){
136                     int number,result;
137                     System.out.print(d.getData1()+"*"+d.getData3()+"=");
138                     number=sc.nextInt();
139                     result=d.getData1()*d.getData3();
140                     if(number==result){
141                         count++;
142                     }
143                     System.out.println("剩余时间："+seconds);
144                 }
145                 if(d.getData2()==3){
146                     int number,result;
147                     System.out.print(d.getData1()+"/"+d.getData3()+"=");
148                     number=sc.nextInt();
149                     result=d.getData1()*d.getData3();
150                     if(number==result){
151                         count++;
152                     }
153                     System.out.println("剩余时间："+seconds);
154                 }
155             }
156             System.out.println("正确个数为："+count+" 准确率为："+count/(float)30);
157             System.exit(0);
158         }
159     }