Java LinkedHashMap get()用法及代碼示例

在 Java ，get()方法的LinkedHashMap 類用於檢索或獲取參數中提到的特定鍵映射的值。當映射不包含鍵的此類映射時，它返回 NULL。

--> java.util Package
    --> LinkedHashMap Class
         --> get() Method

用法:

Linked_Hash_Map.get(Object key_element)

參數：1個參數key_element對象類型，指的是要獲取其關聯值的鍵。

返回類型：與相關的值key_element在參數中。

示例 1：將字符串值映射到整數鍵。

Java


// Java Program to illustrate get() method 
// of LinkedHashMap 
// Mapping String Values to Integer Keys 
  
// Importing required classes 
import java.util.*; 
  
// Main class 
public class GFG { 
  
    // Main driver method 
    public static void main(String[] args) 
    { 
  
        // Creating an empty HashMap 
        LinkedHashMap<Integer, String> li_hash_map 
            = new LinkedHashMap<Integer, String>(); 
  
        // Mapping string values to int keys 
        // using put() method 
        li_hash_map.put(10, "Geeks"); 
        li_hash_map.put(15, "4"); 
        li_hash_map.put(20, "Geeks"); 
        li_hash_map.put(25, "Welcomes"); 
        li_hash_map.put(30, "You"); 
  
        // Printing all elements of LinkedHashMap 
        System.out.println("Initial Mappings are: "
                           + li_hash_map); 
  
        // Getting the value of 25 
        System.out.println("The Value is: "
                           + li_hash_map.get(25)); 
  
        // Getting the value of 10 
        System.out.println("The Value is: "
                           + li_hash_map.get(10)); 
    } 
}

輸出：

Initial Mappings are: {10=Geeks, 15=4, 20=Geeks, 25=Welcomes, 30=You}
The Value is: Welcomes
The Value is: Geeks

示例 2：將整數值映射到字符串鍵

Java


// Java Program to Illustrate get() method 
// Mapping Integer Values to String Keys 
  
// Importing required classes 
import java.util.*; 
  
// Main class 
public class Linked_Hash_Map_Demo { 
  
    // Main driver method 
    public static void main(String[] args) 
    { 
  
        // Creating an empty LinkedHashMap 
        LinkedHashMap<String, Integer> li_hash_map 
            = new LinkedHashMap<String, Integer>(); 
  
        // Mapping int values to string keys 
        // using put() method 
        li_hash_map.put("Geeks", 10); 
        li_hash_map.put("4", 15); 
        li_hash_map.put("Geeks", 20); 
        li_hash_map.put("Welcomes", 25); 
        li_hash_map.put("You", 30); 
  
        // Printing all elements of LinkedHashMap 
        System.out.println("Initial Mappings are: "
                           + li_hash_map); 
  
        // Getting the value of "Geeks" 
        System.out.println("The Value is: "
                           + li_hash_map.get("Geeks")); 
  
        // Getting the value of "You" 
        System.out.println("The Value is: "
                           + li_hash_map.get("You")); 
    } 
}

輸出：

Initial Mappings are: {Geeks=20, 4=15, Welcomes=25, You=30}
The Value is: 20
The Value is: 30

Note: The same operation can be performed with any type of Mappings with variation and combination of different data types.

相關用法

注：本文由純淨天空篩選整理自Chinmoy Lenka大神的英文原創作品 LinkedHashMap get() Method in Java with Examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。