how to use swap in java code example

Example 1: swap function java

public static void swap(int[] a, int i, int j){
	int temp = a[i];
  	a[i] = a[j];
  	a[j] = temp;
}

Example 2: swapping values in java using a function not working

#include <stdio.h>

int main() {
   int a = 23, b = 47;
   int t;
   printf("Before. a: %d, b: %d\n", a, b);
   t = a;
   a = b;
   b = t;
   printf("After.  a: %d, b: %d\n", a, b);
   return 0;
}