创建一个HashMap-
HashMap hm = new HashMap();
将元素添加到我们稍后将显示的HashMap中-
hm.put("Maths", new Integer(98)); hm.put("Science", new Integer(90)); hm.put("English", new Integer(97)); hm.put("Physics", new Integer(91));
现在,要显示HashMap元素,请使用Iterator。以下是显示HashMap元素的示例-
import java.util.*; public class Demo { public static void main(String args[]) { //创建一个哈希映射 HashMap hm = new HashMap(); //将元素放入映射 hm.put("Maths", new Integer(98)); hm.put("Science", new Integer(90)); hm.put("English", new Integer(97)); hm.put("Physics", new Integer(91)); hm.put("Chemistry", new Integer(93)); //获取一组条目 Set set = hm.entrySet(); //获取一个迭代器 Iterator i = set.iterator(); //显示元素 while(i.hasNext()) { Map.Entry me = (Map.Entry)i.next(); System.out.print(me.getKey() + ": "); System.out.println(me.getValue()); } System.out.println(); System.out.println("Elements: "+hm); } }
输出结果
Maths: 98 English: 97 Chemistry: 93 Science: 90 Physics: 91 Elements: {Maths=98, English=97, Chemistry=93, Science=90, Physics=91}