Chapter 7 Question 5 (Print different numbers)

Chapter 7 Question 5 (Print different numbers)

• **7.5 (Print different numbers) Write a program, read in 10 numbers, display the number of different numbers, and display these numbers in the order of input, separated by a space (that is, a number appears multiple times, also Only shown once). (Hint: read in a number, if it is a new number, store it in the array. If the number is already in the array, ignore it.) After input, the array contains all different numbers. The following is a running example of this program:
  Enter 10 numbers: 1 2 3 2 1 6 3 4 5 2
  The number of distinct numbers is 6
  The distinct numbers are: 1 2 3 6 4 5
  **7.5（Print different numbers）Write a program, read in 10 numbers, display the number of different numbers, and display these numbers in the order of input, separated by a space (that is, a number appears many times, but only once). (tip: read in a number and store it in the array if it is a new number. If the number is already in array China, ignore it.) After input, the array contains different numbers. Here is an example of how to run this program:
  Enter 10 numbers: 1 2 3 2 1 6 3 4 5 2
  The number of distinct numbers is 6
  The distinct numbers are: 1 2 3 6 4 5
• Reference Code:

package chapter07;

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Code_05 {
    
    
    public static void main(String[] args) {
    
    
        List<Integer> list = new ArrayList<Integer>();
        Scanner input = new Scanner(System.in);
        System.out.print("Enter 10 numbers: ");
        String[] strings = input.nextLine().split(" ");
        int count = 0;
        for (int i = 0;i < strings.length;i++) {
    
    
            if (!list.contains(Integer.parseInt(strings[i]))) {
    
    
                list.add(Integer.parseInt(strings[i]));
                count++;
            }
        }
        System.out.println("The number of distinct numbers is " + count);
        System.out.print("The distinct numbers are: ");
        for (int i : list)
        System.out.print(i + " ");
    }
}

• The results show that:

Enter 10 numbers: 1 2 3 2 1 6 3 4 5 2
The number of distinct numbers is 6
The distinct numbers are: 1 2 3 6 4 5 
Process finished with exit code 0