java - 如何修复计算java中子字符串的出现次数

Question

我正在尝试使用子字符串获取男性和女性的数量。但在本例中，我创建了 2 个类，并使用扫描仪输入我想要的记录数。如何在for 循环中合并计数？我已经得到了 M 和 F 的计数，但它没有得到我的预期输出。我尝试删除 for 循环，仅删除 A[i] = Output 但它需要位于循环中，否则可能会出错。如果我再次放置 for 循环，它会起作用，但它被分开“它在输出框上”。如果我做错了请告诉我。

public class Input {

    String info, gender;
    int resultf;
    int resultm;

    static Scanner in = new Scanner (System.in);

    public void inputted() {

        System.out.print("Enter a Gender: ");
        info = in.nextLine();

        gender = info.substring(0,1);
        }

    public void Output() {
        resultm = info.length() - info.replaceAll("M", "").length();
        resultf = info.length() - info.replaceAll("F", "").length();
        System.out.println("Male: "+resultm);
        System.out.println("Female: "+resultf);
        }

}

public class Output {

    static Input A[] = new Input [100];
    static Scanner in = new Scanner (System.in);

    public static void main (String args []) {

        int i, size;
        //Input
        System.out.print("Enter how many record: ");
        size = in.nextInt();

        for (i = 0; i < size; i++) {
            A[i] = new Input();
            A[i].inputted();
        }   

        System.out.println();
        //Print
        for (i = 0; i < size; i++) {
            System.out.println("Gender: "+A[i].gender);
        }

        System.out.println();
        //Output Section
        for (i = 0; i < size; i++) {
            A[i].Output();
        }
    }

}

输出:

Enter how many record: 2
Enter a Gender: M
Enter a Gender: F

Gender: M
Gender: F

Male: 1
Female: 0
Male: 0
Female: 1

预期输出:

Enter how many record: 2
Enter a Gender: M
Enter a Gender: F

Gender: M
Gender: F

Male: 1
Female: 1

Answer 1

你必须在主函数中计算它，而不是在输入类中。

public class Input {
  //add functions below
  public boolean IsMale(){return resultm == 1;}
  public boolean IsFemale(){return resultf == 1;}

  //another way without boolean
  public int GetMaleCount(){return resultm;}
  public int GetFemaleCount(){return resultf;}
}

将 main 中的输出部分更改为以下内容:

int male = 0;
int female = 0;
for (i = 0; i < size; i++) {
  //if(A[i].IsMale()){male ++;}
  //if(A[i].IsFemale()){female ++;}
  //another way without boolean
  male += A[i].GetMaleCount();
  female += A[i].GetFemaleCount();
}
System.out.println("Male: "+male);
System.out.println("Female: "+female);