(Convert milliseconds to hours, minutes, and seconds) Write a method that converts milliseconds to hours, minutes and seconds using the following header:

public static String convertMillis(long millis)

The method returns a string as hours:minutes:seconds.  For example, convertMillis(5500)  returns a string 0:0:5, convertMillis(100000) returns a string 0:1:40, convertMillis(555550000) returns a string 154:19:10.

ConvertMil.java

/**
 * Convert milliseconds to hours, minutes, and seconds.
 */
 import javax.swing.JOptionPane; // import JOptionpane.
public class ConvertMil {

    // Main Method.
    public static void main(String[] args) {
    	long millisec = 0;
    	// Promt to user to enter milliseconds.
	 	while(millisec <= 0){
	 		millisec = Long.parseLong(JOptionPane.showInputDialog("Please enter the milliseconds:"));
	 	}

    	String time = convertMillis(millisec); // convert milliseconds.
    	prntStr(millisec+" milliseconds is equal to "+ time); // Print hour:munite:second

    } // End of main method.

    /** Convert Millisecond to hour:munite:second */
    public static String convertMillis(long millis){

    	long sumsecond,second,summunite,munite,hour; // Declare variables.
    		sumsecond = millis/1000; // sum of second
    		second = sumsecond%60; // munite

    		summunite = sumsecond/60; // sum of munite
    		munite = summunite%60; // munite

    		hour = summunite/60; // hour

    	String result = hour+":"+munite+":"+second;
    	return result;

    } // End of convertMillis method.

    /** Print String */
    public static void prntStr(String print){

    	System.out.print(print);

    } // Enf of prntStr method.
} // End of public class.