在while循环中输入带有System.out.format的命令

Question

i wrote this simple java program but output is not correct. i find out that if i use System.out.println instead of System.out.format the problem solved. but i want to use System.out.format in while loop and understand why this happened? this program give members of an array from user and sort theme. (my IDE is netbeans 11.3 in linux)

package array_example2;
import java.util.Scanner;
import java.util.Arrays;
public class Main { 
public static void main(String[] args) {       
    Scanner input = new Scanner(System.in);
    System.out.println("Enter Array length : ");
    int n = input.nextInt();
    int[] x = new int[n];              
    int i=0;
    while (i<n)
    {            
        System.out.format("Enter Array member %d",i);
        x[i] = input.nextInt();
        i++;
    }
    MySort.mysort(x);
    System.out.format("Array x = %s", Arrays.toString(x));        
}    

MySort class:

package array_example2;
import java.util.Arrays;
public class MySort {
public static void mysort(int...a){
    Arrays.sort(a);

}

output:

Enter Array length : 
3
67
89
23
Enter Array member 0Enter Array member 1Enter Array member 2Array x = [23, 67, 89]
BUILD SUCCESSFUL in 24s

Answer 1

Use \n or %n to indicate a new line at the end of the string. System.out.format doesn't create a new line like System.out.println does.

System.out.format("Array x = %s%n", Arrays.toString(x));     

Answer 2

In your while loop, for the System.format method call, you need to add a new line, using the %n to trigger the scanner for more input.:

while (i < n) {
    System.out.format("Enter Array member %d%n", i+1);
    x[i++] = input.nextInt();
}