EnumMap put() Method in Java

The Java.util.EnumMap.put(key, value) method in Java is used to associated specified key-value pair. In this case, if the values are repeated, the older values are replaced.

Syntax:

Enum_Map.put(key, value)

Parameters Used: The method takes two parameters.

• key – It is the specified key with which the value is associated.
• value – It is the value associated with the specified key.

Return Value: The function returns the old value associated with the specified key.

Below programs illustrate the working of put(key, value) method:
Program 1:

// Java program to demonstrate keySet()
import java.util.*;

// An enum of geeksforgeeks
public enum gfg {
    Global_today,
    India_today,
    China
}
;

class Enum_demo {
    public static void main(String[] args)
    {

        EnumMap<gfg, Integer> mp = new
                 EnumMap<gfg, Integer>(gfg.class);

        // Values are associated
        mp.put(gfg.Global_today, 799);
        mp.put(gfg.India_today, 69);

       // Display the initial map
       System.out.println("The map is: " + mp);

        // Stores the old value associated with the key
        int prev_value = mp.put(gfg.India_today, 72);

        // Prints the old value
        System.out.println("Previous value: " + prev_value);

       // Display the final map
       System.out.println("The final map is: " + mp);
    }
}

Output:

The map is: {Global_today=799, India_today=69}
Previous value: 69
The final map is: {Global_today=799, India_today=72}

Program 2:

// Java program to demonstrate the working of keySet()
import java.util.*;

// an enum of geeksforgeeks
// ranking globally and in india
public enum gfg {
    Global_today,
    India_today,
    China_today
}
;

class Enum_demo {
    public static void main(String[] args)
    {

        EnumMap<gfg, Integer> mp = new EnumMap<gfg, Integer>(gfg.class);

        // Values are associated
        mp.put(gfg.Global_today, 799);
        mp.put(gfg.India_today, 69);

       // Display the initial map
       System.out.println("The map is: " + mp);

        // Stores the old value associated with the key
        int prev_value = mp.put(gfg.Global_today, 800);

        // Prints the old value
        System.out.println("Previous value: " + prev_value);

       // Display the final map
       System.out.println("The final map is: " + mp);
    }
}

Output:

The map is: {Global_today=799, India_today=69}
Previous value: 799
The final map is: {Global_today=800, India_today=69}