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Java Program to find keys from both the Linked HashMap and store it in a list alternatively
Let us first create a LinkedHashMap with key-value pair −
Map<String, String>map1 = new LinkedHashMap<String, String>();
map1.put("1", "Jim");
map1.put("2", "David");
map1.put("3", "Tom");
map1.put("4", "Sam");
map1.put("5", "Steve");Let us now create another LinkedHashMap with key-value pair −
Map<String, String>map2 = new LinkedHashMap<String, String>();
map2.put("6", "Katie");
map2.put("7", "John");
map2.put("8", "Kane");
map2.put("9", "Chris");Now, create a new List and store the keys in it for both the above Map −
List<String>list = new ArrayList<String>(); list.addAll(map1.keySet()); list.addAll(map2.keySet());
Example
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
public class Demo {
public static void main(String[] args) {
Map<String, String>map1 = new LinkedHashMap<String, String>();
map1.put("1", "Jim");
map1.put("2", "David");
map1.put("3", "Tom");
map1.put("4", "Sam");
map1.put("5", "Steve");
Map<String, String>map2 = new LinkedHashMap<String, String>();
map2.put("6", "Katie");
map2.put("7", "John");
map2.put("8", "Kane");
map2.put("9", "Chris");
List<String>list = new ArrayList<String>();
list.addAll(map1.keySet());
list.addAll(map2.keySet());
System.out.println("Keys...");
for (String str: list) {
System.out.println(str);
}
}
}Output
Keys... 1 2 3 4 5 6 7 8 9
Updated on: 30-Jul-2019
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