用Java显示HashMap元素
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-
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}