如何检查一个数组是否包含相同的值？

Question

I'm learning about Java array and got stuck on this problem. I want to add the value of num and delete duplicate name if the name if equals. Thank you in advanced. Here's a little bit of my code:

public static void main(String[]Args){
    Scanner input = new Scanner(System.in);
    int n;
    System.out.println("Input n= ");
    n=input.nextInt();
    String name[] = new String[n];
    int num[] = new int[n];

    for (int i = 0; i<n; i++){
        System.out.println("Input name= ");
        name[i]= input.next();
        System.out.println("Input num= ");
        num[i]=input.nextInt();
    }

for(int i=0;i<n;i++){       
System.out.println(name[i] + " " + num[i]);

    }

I'm expecting the result to be:

Example1 5

Example2 6

IF I input n=3

name[1]="Example1"

name[2] = "Example2"

name[3] = "Example1"

num[1] = 2

num[2] = 6

num[3] = 3

The actual result is:

Example1 2

Example2 6

Example1 3

Answer 1

Remember that arrays starts at 0. This solution won't clear array so you will need to modify some of that to shift both arrays to left.

int n = 3;
    String[] name = new String[n];
    int[] num= new int[n];
    
    name[0] = "Example1";
    name[1] = "Example2";
    name[2] = "Example1";
    num[0] = 2;
    num[1] = 6;
    num[2] = 3;
    
    
    for (int i = 0; i < name.length; i++) {
        for (int j = i+1; j < name.length; j++) {
            if (name[i].equals(name[j])) {
                num[i] += num[j];
                num[j] = 0;
                name[j] = null;
            }
        }
    }


    for(int i=0;i<n;i++){
        if (name[i] != null) {
            System.out.println(name[i] + " " + num[i]);
        }
    }

Output:

Example1 5

Example2 6

Answer 2

The following program accomplishes what you are after:

class Main {
  public static void main(String[] args) {
    int n = 2;
    String[] name = {"Example1", "Example2"};
    int[] num = {5, 6};

    //this is a comment

    for (int i = 0; i < n; i++){
      System.out.println(name[i] + "  " + num[i]);
    }

  }
}

You need to declare an array for num , name , and you also need to change your n value to 2 if you want to keep your loop format and only print out two elements.