Java - Calculate Execution Time

import java.util.Date;

public class TimeMillisecond {
    public static void main(String[] argv) {

        long lStartTime = new Date().getTime(); //start time

        String sArray1[] = createArray(); //method execute

        long lEndTime = new Date().getTime(); //end time

        long difference = lEndTime - lStartTime; //check different

        System.out.println("Elapsed milliseconds: " + difference);

    }

    static String[] createArray() {

        String sArray[] = new String[100000];

        for (int i = 0; i < 100000; i++)
            sArray[i] = "Array " + i;

        return sArray;
    }
}

import java.util.Date;

public class TimeMillisecond {

public static void main(String[] argv) {

long lStartTime = new Date().getTime(); //start time

String sArray1[] = createArray(); //method execute

long lEndTime = new Date().getTime(); //end time

long difference = lEndTime - lStartTime; //check different

System.out.println("Elapsed milliseconds: " + difference);

}

static String[] createArray() {

String sArray[] = new String[100000];

for (int i = 0; i < 100000; i++)

sArray[i] = "Array " + i;

return sArray;

}

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