如何增加存储的值

Question

（用java编写）我有两个来自控制台的输入（历史、地理）。我可以将历史/地理的值输入为任何整数，也可以输入任意次数。当我决定停止接受控制台输入时，我需要了解有多少历史和地理。我已成功获取控制台输入。然而，我不知道我的代码应该如何存储（记住）我为历史和地理输入的内容，然后把它吐出来。请帮忙。在下面的例子中，我不知道如何实现用注释的第二部分

控制台>

Select 1.Subject 2.Subject Count //console message  
1 //console input  
Which Subject? 1.History 2. Geography //console message  
1 //console input  
How many History ? //console message  
5 //console input 

[Another round]  
console>   
Select 1.Subject 2.Subject Count //console message  
2 //console input  
5 History // console message  

Answer 1

你问的问题不是很清楚，但据我所知，这可能对你有帮助

您也可以在这里使用SwitchCase语句！

    import java.io.*;
    public class Subject{
    public static void main(String[] args)throws IOException{
     InputStreamReader isr = new InputStreamReader(System.in);
     BufferedReader in = new BufferedReader(isr);
     boolean flag = true;
     int hist = 0, geog = 0, val = 0;
     while(flag){
         System.out.println("Enter the number for subjectn1.Historyn2.Geographyn -1.Exit");
         val = Integer.parseInt(in.readLine());
         if(val == 1){
             hist ++;
         }  
         else if(val == 2){
             geog ++;
         }
         else if(val == -1){
             System.out.print("Total History: ", hist);
             System.out.print("Total Geography: ", geog);
             flag = false;
             continue;
         }
         else{
             System.out.println("invalid option");
             continue;
         }
     }

 }
}
/*
 int hist[] = new int[100];
 int geog[] = new int[100];
 int i = 0;
 int j = 0
 while(true){
  //if history 
  //then do this 
   hist[i] = i + 1;
    i++;
   //if geography
   //do this
   geog[j] = i + 1;
   j++
   //if user wants to exit
   for(int m = 0; m<=i; m++){
      //calculate sum like this: Sum += hist[m];
      //print sum   
   }
   for(int n = 0; m<=j; n++){
       //calculate sum like this: Sum2 += geog[n];
       //print Sum2 
     } 
 }
 */