что не так-то?
package com.javarush.task.pro.task03.task0305;
import java.util.Scanner;
/*
Три числа
*/
public class Solution {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int n1 = scanner.nextInt();
int n2 = scanner.nextInt();
int n3 = scanner.nextInt();
if (n1 == n2) {System.out.println(n1+" "+n2);}
if (n1 == n3) {System.out.println(n1+" "+n3);}
if (n3 == n2) {System.out.println(n3+" "+n2);}
if (n1 == n2 && n2 == n3){System.out.println(n1+" "+n2+" "+n3);}
else {System.out.println();}
}
}