Calculate the angle between hour hand and minute hand

/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;


/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		System.out.println("Difference Angle: " + calculateAngle(3.00, 30.00));
	}
	public static int calculateAngle(double h, double m){
		// check the all input validation
		if(h<0 || h>12 || m<0 || m>60)
		System.out.println("Please provide correct inputs");
		
		// both hour and minutes in same point
		if(h==12) h=0;
		if(m==60) m=0;
		
		int hourAngle=(int)(h*60+m)/2;
		int minuteAngle=(int)(6*m);
		
		int angle=Math.abs(hourAngle-minuteAngle);
		angle=min(360-angle, angle);
		return angle;
		


	}
	public static int min(int x, int y){
	return (x<y)? x:y;
		}
}