Create a Java program that asks the user to enter four numbe

Create a Java program that asks the user to enter four numbers between 0-9, then checks to see how many pairs of numbers there are (in any order). There can be 0 pairs, 1 pair, or 2 pairs. Once a number is assigned to a pair, it cannot be used to form a different pair. For example:

If the user enters   0 1 0 1   the output would be 2 pair.

If the user enters   9 9 5 5   the output would be 2 pair.

If the user enters   9 9 9 9   the output would be 2 pair.

If the user enters   9 9 9 5   the output would be 1 pair.

If the user enters   3 2 1 3   the output would be 1 pair.

If the user enters   5 6 7 1   the output would be 0 pair.

If the user enters   1 0 1 1   the output would be 1 pair.

Solution

import java.util.Scanner;
public class Pair
{
public static void main(String args[])
{
Scanner s=new Scanner(System.in);
int p2=0,p3=0;
int a,b,c,d;
System.out.println(\"\ enter a b c and d:\");
a=s.nextInt();
b=s.nextInt();
c=s.nextInt();
d=s.nextInt();
if(a==b)
{
p2++;
if(c==d)p2++;
}
if(b==c)
{
p2++;
if(a==d)
p2+;
}
if(a==c)
{
p2++;
if(b==d)p2++;
}
if(a==b&&b==c)
p3++;
if(b==c&&c==d)p3++;
if(a==c&&c==d)p3++;
System.out.println(p2+\" two element pairs \");
System.out.println(p3+\" three element pairs\");
}
}