Java LinkedHashMap get() Method

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Description

The Java LinkedHashMap get() method returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.

Declaration

Following is the declaration for java.util.LinkedHashMap.get() method

public V get(Object key)

Parameters

key − the key whose associated value is to be returned

Return Value

This method returns the value to which the specified key is mapped, or null if this map contains no mapping for the key

Exception

NA

Example of Getting Value From a LinkedHashMap of Integer, Integer Pair Example

The following example shows the usage of Java LinkedHashMap get() method to get a value based on a key from a Map. We've created a Map object of Integer,Integer pair. Then few entries are added, map is printed. Using get() method, a value is retrieved and printed.

package com.tutorialspoint;

import java.util.LinkedHashMap;

public class LinkedHashMapDemo {
   public static void main(String args[]) {
      
      // create hash map
      LinkedHashMap<Integer,Integer> newmap = new LinkedHashMap<>();

      // populate hash map
      newmap.put(1, 1);
      newmap.put(2, 2);
      newmap.put(3, 3); 

      System.out.println("Initial map elements: " + newmap);

      System.out.println("Value: " + newmap.get(1));
   }    
}

Output

Let us compile and run the above program, this will produce the following result.

Initial map elements: {1=1, 2=2, 3=3}
Value: 1

Example of Getting Value From a LinkedHashMap of Integer, String Pair Example

The following example shows the usage of Java LinkedHashMap get() method to get a value based on a key from a Map. We've created a Map object of Integer,String pair. Then few entries are added, map is printed. Using get() method, a value is retrieved and printed.

package com.tutorialspoint;

import java.util.LinkedHashMap;

public class LinkedHashMapDemo {
   public static void main(String args[]) {
      
      // create hash map
      LinkedHashMap<Integer,String> newmap = new LinkedHashMap<>();

      // populate hash map
      newmap.put(1, "tutorials");
      newmap.put(2, "point");
      newmap.put(3, "is best"); 

      System.out.println("Initial map elements: " + newmap);

      System.out.println("Value: " + newmap.get(1));
   }    
}

Output

Let us compile and run the above program, this will produce the following result.

Initial map elements: {1=tutorials, 2=point, 3=is best}
Value: tutorials

Example of Getting Value From a LinkedHashMap of Integer, Object Pair Example

The following example shows the usage of Java LinkedHashMap get() method to get a value based on a key from a Map. We've created a Map object of Integer,Student pair. Then few entries are added, map is printed. Using get() method, a value is retrieved and printed.

package com.tutorialspoint;

import java.util.LinkedHashMap;

public class LinkedHashMapDemo {
   public static void main(String args[]) {
      
      // create hash map
      LinkedHashMap<Integer,Student> newmap = new LinkedHashMap<>();

      // populate hash map
      newmap.put(1, new Student(1, "Julie"));
      newmap.put(2, new Student(2, "Robert"));
      newmap.put(3, new Student(3, "Adam"));

      System.out.println("Initial map elements: " + newmap);

      System.out.println("Value: " + newmap.get(1));
   }    
}
class Student {
   int rollNo;
   String name;

   Student(int rollNo, String name){
      this.rollNo = rollNo;
      this.name = name;
   }

   @Override
   public String toString() {
      return "[ " + this.rollNo + ", " + this.name + " ]";
   }
}

Output

Let us compile and run the above program, this will produce the following result.

Initial map elements: {1=[ 1, Julie ], 2=[ 2, Robert ], 3=[ 3, Adam ]}
Value: [ 1, Julie ]