need this in java please make it as simple as possible

Design a class named StopWatch. The class contains:

• Private data fields startTime and endTime with getter methods.
• A no-arg constructor that initializes startTime with the current time.
• A method named start() that resets the startTime to the current time.
• A method named stop() that sets the endTime to the current time.
• A method named getElapsedTime() that returns the elapsed time for the stopwatch in milliseconds.

Write a test program that measures the execution time of sorting 100,000 numbers (generated randomly in the range of 0 to 100) using the following selection sort method:

/** The method for sorting the numbers */

public static void selectionSort(int[] list) {

for (int i = 0; i < list.length - 1; i++) {

// Find the minimum in the list[i..list.length-1]

int currentMin = list[i];

int currentMinIndex = i;

for (int j = i + 1; j < list.length; j++) {

if (currentMin > list[j]) {

currentMin = list[j];

currentMinIndex = j;

}

}

// Swap list[i] with list[currentMinIndex] if necessary;

if (currentMinIndex != i) {

list[currentMinIndex] = list[i];

list[i] = currentMin;

}

}

}