Last Updated : 02 Jan, 2019
This method is used to copy all of the mappings from the specified map to this map.
Syntax:void putAll(Map m)Parameters:
This method has the only argument map m, which contains key-value mappings to be copied to given map.
Returns:This method returns previous value associated with the key if present, else return -1. Below programs show the implementation of int putAll() method.
Program 1: Java
// Java code to show the implementation of
// putAll method in Map interface
import java.util.*;
public class GfG {
// Driver code
public static void main(String[] args)
{
// Initializing a Map of type HashMap
Map<Integer, String> map = new HashMap<>();
map.put(1, "One");
map.put(3, "Three");
map.put(5, "Five");
map.put(7, "Seven");
map.put(9, "Nine");
System.out.println(map);
Map<Integer, String> mp = new HashMap<>();
mp.put(10, "Ten");
mp.put(30, "Thirty");
mp.put(50, "Fifty");
map.putAll(mp);
System.out.println(map);
}
}
Output:
{1=One, 3=Three, 5=Five, 7=Seven, 9=Nine}
{1=One, 50=Fifty, 3=Three, 5=Five, 7=Seven, 9=Nine, 10=Ten, 30=Thirty}
Program 2:
Below is the code to show implementation of put().
Java
// Java code to show the implementation of
// putAll method in Map interface
import java.util.*;
public class GfG {
// Driver code
public static void main(String[] args)
{
// Initializing a Map of type HashMap
Map<String, String> map = new HashMap<>();
map.put("1", "One");
map.put("3", "Three");
map.put("5", "Five");
map.put("7", "Seven");
map.put("9", "Nine");
System.out.println(map);
Map<String, String> mp = new HashMap<>();
mp.put("10", "Ten");
mp.put("30", "Thirty");
mp.put("50", "Fifty");
map.putAll(mp);
System.out.println(map);
}
}
Output:
{1=One, 3=Three, 5=Five, 7=Seven, 9=Nine}
{1=One, 3=Three, 5=Five, 7=Seven, 9=Nine, 50=Fifty, 30=Thirty, 10=Ten}
Reference: Oracle Docs
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