ted tarray pack sort row main package arc
- package study.stage2;
- import java.util.Arrays;
- /**
- * Created by Sandy.Liu on 2017/7/19.
- */
- public class ArrayTest {
- public static void main(String[] args) throws Exception {
- int array[] = {
- 3,
- 4,
- 2,
- 24,
- 6,
- -23,
- -4,
- -56
- };
- System.out.println(array.length); //8
- printArray(array); //{3,4,2,24,6,-23,-4,-56}
- array = insertElement(array, 1, 5);
- printArray(array); //{3,4,2,24,6,1,-23,-4,-56}
- Arrays.sort(array);
- printArray(array); //{-56,-23,-4,1,2,3,4,6,24}
- int index = Arrays.binarySearch(array, 4);
- System.out.println(index);
- }
- public static void printArray(int array[]) {
- for (int i = 0; i System.out.print(array[i] + " ");
- }
- System.out.println();
- }
- public static int[] insertElement(int original[], int element, int index) {
- int length = original.length;
- if (index < 0) {
- System.out.println("out of range");
- } else if (index > original.length) {
- System.out.println("out of range");
- }
- int destination[] = new int[length + 1];
- //arrayCopy(originalArray,index, targetArray,index1,count) 把orginal里的从index位开始的值copy到targetArray里从index1开始的位置,
- // ,copy的位数是count
- System.arraycopy(original, 0, destination, 0, index);
- destination[index] = element;
- System.arraycopy(original, index, destination, index + 1, length - index);
- return destination;
- }
- }
java System.arraycopy()
来源: http://www.bubuko.com/infodetail-2216507.html