42 lines
1.3 KiB
Java
42 lines
1.3 KiB
Java
package com.inmind.map01;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.Map;
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import java.util.Map.Entry;
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import java.util.Set;
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/*
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键值对遍历
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- public Set<Entry<K,V>> entrySet(): 获取到Map集合中所有的键值对对象的集合(Set集合)。
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*/
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public class MapDemo03 {
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public static void main(String[] args) {
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//创建一个双列集合，K为String，V也为String
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Map<String, String> map = new HashMap<>();
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//添加一对数据（增加）
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map.put("刘备", "孙尚香");
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map.put("吕布", "貂蝉");
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map.put("董卓", "貂蝉");
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System.out.println(map);
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//直接获取双列集合所有的键值对对象
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Set<Entry<String, String>> entries = map.entrySet();
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//迭代器遍历键值对
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Iterator<Entry<String, String>> iterator = entries.iterator();
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while (iterator.hasNext()) {
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Entry<String, String> entry = iterator.next();
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System.out.println(entry.getKey()+"-"+entry.getValue());
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}
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System.out.println("-------------------------------------");
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//foreach遍历键值对
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for (Entry<String, String> entry : entries) {
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System.out.println(entry.getKey()+"-"+entry.getValue());
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}
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}
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}
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