在0-100内取20个随机数,偶数排序
import java.util.ArrayList;import java.util.Collections;import java.util.List;import java.util.Random;/*** @author WilliamRong**/public class test {public static void main(String[] args) { // TODO Auto-generated method stub List<Integer> intList = new ArrayList<Integer>(); List<Integer> intList2 = new ArrayList<Integer>(); Random random = new Random(); for (int i = 1; i <= 20; i++) { int j = random.nextInt(100); intList.add(j); System.out.println(j); } for (int i = 0; i < intList.size(); i++) { if (intList.get(i) % 2 == 0) { intList2.add(intList.get(i)); } } System.out.println("----------------------------------"); for (int i = 0; i < intList2.size(); i++) { System.out.println(intList2.get(i)); } System.out.println("----------------------------------"); Collections.sort(intList2);//正序 Collections.sort(intList2, Collections.reverseOrder());//倒序 for (int i = 0; i < intList2.size(); i++) { System.out.println(intList2.get(i)); }}}?