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import java.util.*; public class Main { public static void main(String args[]) { HashMap<Integer, String> hm = new HashMap<Integer, String>(); // 实现 map 接口 hm.put(110,"Ravi"); hm.put(120,"Prateek"); hm.put(130, "Davesh"); hm.put(140, "Kamal"); hm.put(150, "Pawan"); Iterator <Integer> it = hm.keySet().iterator(); //keyset 是一个方法 while(it.hasNext()) { int key=(int)it.next(); System.out.println("Roll no.: "+key+" name: "+hm.get(key)); } } }
运行结果 :
正在执行...
