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Java Program to copy all the key-value pairs from one Map into another
To copy, use the putAll() method.
Let us first create two Map −
First Map −
HashMap hm = new HashMap();
hm.put("Wallet", new Integer(700));
hm.put("Belt", new Integer(600));Second Map −
HashMap hm2 = new HashMap();
hm.put("Bag", new Integer(1100));
hm.put("Sunglasses", new Integer(2000));
hm.put("Frames", new Integer(800));Now, copy the key-value pairs from one Map to another −
hm.putAll(hm2);
The following is an example to copy all the key-value pairs from one Map into another −
Example
import java.util.*;
public class Demo {
public static void main(String args[]) {
// Create hash map 1
HashMap hm = new HashMap();
hm.put("Wallet", new Integer(700));
hm.put("Belt", new Integer(600));
System.out.println("Map1 = "+hm);
// Create hash map 2
HashMap hm2 = new HashMap();
hm.put("Bag", new Integer(1100));
hm.put("Sunglasses", new Integer(2000));
hm.put("Frames", new Integer(800));
hm.putAll(hm2);
System.out.println("Map1 after copying values of Map2 = "+hm);
}
}Output
Map1 = {Belt=600, Wallet=700}
Map1 after copying values of Map2 = {Frames=800, Belt=600, Wallet=700, Bag=1100, Sunglasses=2000}
Updated on: 30-Jul-2019
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