Java 随机

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①：随机生成20个小于10的数

package IO; import java.util.Random; public class RandomTest { public static void main(String[] args) {   Random random =new Random();    random.nextInt(10);      for(int i =0;i<20;i++){        System.out.print(random.nextInt(10));     }  }}

②从5个人中每次随机生成两个人的名字

package IO; import java.util.HashMap;import java.util.HashSet;import java.util.Iterator;import java.util.Map;import java.util.Random;import java.util.Set; public class RandomTest1 {  public static void main(String[] args) {  Map map = new HashMap();  map.put(1, "张三");  map.put(2, "李四");  map.put(3, "王五");  map.put(4, "周六");  map.put(5, "孙七");  Random random = new Random();  Set set = new HashSet();  for (int i = 0; i < 3; i++) {   set.add(map.get((random.nextInt(5)) +1));  }  Iterator it = set.iterator();  while (it.hasNext()) {   System.out.println(it.next());       }     }}

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