importjava.util.HashMap;importjava.util.Map;publicclassMapExample {publicstaticvoidmain(String[] args) {//创建一个HashMap实例Map<String, Integer> map =newHashMap<>();//向Map中添加键值对map.put("one", 1); map.put("two", 2); map.put("three", 3);//遍历Map的键(keySet)for(String k...
import java.util.Map; public class TestLinkedHashMap { public static void main(String args[]) { System.out.println("***LinkedHashMap***"); Map<Integer,String> map = new LinkedHashMap<Integer,String>(); map.put(6, "apple"); map.put(3, "banana"); map.put(2,"pear"); for (Ite...
Map<String,Integer>linkedHashMap=newLinkedHashMap<>(); 1. 也可以使用带有初始容量和加载因子的构造函数来创建 LinkedHashMap: Map<String,Integer>linkedHashMap=newLinkedHashMap<>(16,0.75f); 1. 添加元素 可以使用put(key, value)方法向 LinkedHashMap 中添加键值对: linkedHashMap.put("apple",1);lin...
我们可以使用流式API来遍历LinkedHashMap,并对元素进行处理。 LinkedHashMap<String,Integer>map=newLinkedHashMap<>();map.put("apple",1);map.put("banana",2);map.put("orange",3);map.entrySet().stream().forEachOrdered(entry->{Stringkey=entry.getKey();Integervalue=entry.getValue();System.out...
Map<String,Integer>hashMap=newHashMap<>(); 2. 添加键值对 使用put方法可以向Map中添加键值对: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 hashMap.put("apple",1);hashMap.put("banana",2); 3. 获取值 通过键获取对应的值: 代码语言:javascript ...
LinkedHashMap是线程不安全的。 回到顶部 LinkedHashMap应用场景 HashMap是无序的,当我们希望有顺序地去存储key-value时,就需要使用LinkedHashMap了。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 Map<String,String>hashMap=newHashMap<String,String>();hashMap.put("name1","josan1");hashMap.put(...
Map<String,String> hashMap = new HashMap<>(); hashMap.put("No1","小明1"); hashMap.put("No2","小明2"); hashMap.put("No3","小明3"); System.out.println("hashMap=>" + hashMap); linkedHashMap示例 1 // 有序,线程不安全,双向链表 ...
package com.itheima.demo4; import java.util.*; public class setdemo1 { public static void main(String[] args) { // Map<String,Integer> map=new HashMap<>();//无序,无索引,不重复 Map<String,Integer> map=new LinkedHashMap<>();//有序,无索引,不重复 map.put("java",13); map.put(...
{@code void foo(Map<String, Integer> m) { Map<String, Integer> copy = new LinkedHashMap<>(m); ... } } This technique is particularly useful if a module takes a map on input, copies it, and later returns results whose order is determined by that of the copy. (Clients generally ...
{@code void foo(Map<String, Integer> m) { Map<String, Integer> copy = new LinkedHashMap<>(m); ... } } This technique is particularly useful if a module takes a map on input, copies it, and later returns results whose order is determined by that of the copy. (Clients generally ...