做网站怎么跟客户谈话/114啦网址导航官网

UML类图：

 ————————————————————————————————————
                                                    StopWatch
————————————————————————————————————
-startTime: int
-endTime: int
————————————————————————————————————
+StopWatch()
+start(): void
+stop(): void
+getElapsedTime(): long
————————————————————————————————————

package pack2;import java.security.SecureRandom;public class StopWatch {private long startTime, endTime;	//开始、结束时间/**初始化当前时间*/public StopWatch() {startTime = System.currentTimeMillis();}/**重设当前时间*/public void start() {startTime = System.currentTimeMillis();}/**将endTime设置为当前时间*/public void end() {	endTime = System.currentTimeMillis();}/**返回以毫秒为单位的流逝时间*/public long getElapsedTime() {return endTime - startTime;}//-----------------------------------------------------public static void main(String[] args) {StopWatch stopWatch = new StopWatch();int[] array = getArray();//		System.out.println("Before sorted: ");
//		printArray(array, 10);stopWatch.start();sort(array);stopWatch.end();System.out.println("\n\n\n\nSort time: " + stopWatch.getElapsedTime());
//		System.out.println("After sorted: ");
//		printArray(array, 10);}/**返回随机数组*/public static int[] getArray() {int[] array = new int[100_000];for (int i = 0; i < array.length; i++) array[i] = 1 + new SecureRandom().nextInt(array.length);return array;}/**选择排序*/public static void sort(int[] array) {for (int i = 0; i < array.length - 1; i++) {int min = array[i];int index = i;for (int j = i + 1; j < array.length; j++) if(array[j] < min) {min = array[j];index = j;}if(index != i) {int temp = array[index];array[index] = array[i];array[i] = temp;}}}/**按给定列数打印数组*/public static void printArray(int[] array, int column) {for (int i = 0; i < array.length; i++) {System.out.printf("%8d", array[i]);if((i + 1) % column == 0) System.out.println();}}
}