public class ArrayCopyTest {
	
    private static final int SIZE_OF_ARRAY = 10000000;
	private static long time;

	
	public static void main(String[] args) {

		        Integer [] sourceArray = new Integer[SIZE_OF_ARRAY];
		        Integer [] destinationArray = new Integer[SIZE_OF_ARRAY];
		        fillArray(sourceArray);
		        
		        startBenchmark();
		        naiveCopy(sourceArray,destinationArray);
		        stopBenchmark();
		        
		        startBenchmark();
		        System.arraycopy(sourceArray, 0, destinationArray, 0, sourceArray.length);
		        stopBenchmark();
		    }



			private static void naiveCopy(Integer [] src, Integer [] dst) {
				for (int i = 0; i < src.length; i++) {
					dst[i]=src[i];
				}
				
			}

			private static void fillArray(Integer [] src) {
				for (int i = 0; i < src.length; i++) {
					src[i]=i;
				}
				
			}
			
			private static void startBenchmark() {
				time = System.currentTimeMillis();
			}
			
			private static void stopBenchmark() {
				time = System.currentTimeMillis() - time;
				System.out.println( "time="+time);
				
			}

}