Dis

public class dis
{
	public static void main( String[] args )
	{
		// test the formula a bit
		double d1 = distance(-2,1 , 1,5);
		System.out.println(" (-2,1) to (1,5) => " + d1 );
 
		double d2 = distance(-2,-3 , -4,4);
		System.out.println(" (-2,-3) to (-4,4) => " + d2 );
 
		System.out.println(" (2,-3) to (-1,-2) => " + distance(2,-3,-1,-2) );
 
		System.out.println(" (4,5) to (4,5) => " + distance(4,5,4,5) );
	}
 
	public static double distance( int x1, int y1, int x2, int y2 )
	{
        double distance = Math.sqrt( (x2-x1) * (x2-x1) + (y2 - y1) * (y2-y1));
        return distance;
	}
}
    

Picture of the output