Check out example codes for "distance between two points java". It will help you in understanding the concepts better.

Code Example 1

static double distance(int x1, int y1, int x2, int y2) 
{ 
    // Calculating distance 
    return Math.sqrt(Math.pow(x2 - x1, 2) +  
                Math.pow(y2 - y1, 2) * 1.0); 
}

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