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Write a Java Program to Merge two lists
PROGRAM: Java Program to Merge two lists
/*Java Program to Merge two lists*/
1: Merge two lists using addAll()
import java.util.ArrayList;
import java.util.List;
class Main {
public static void main(String[] args) {
// create first list
List<Integer> prime = new ArrayList<>();
prime.add(2);
prime.add(3);
prime.add(5);
System.out.println(“First List: ” + prime);
// create second list
List<Integer> even = new ArrayList<>();
even.add(4);
even.add(6);
System.out.println(“Second List: ” + even);
// create merged list
List<Integer> numbers = new ArrayList<>();
numbers.addAll(prime);
numbers.addAll(even);
System.out.println(“Merged List: ” + numbers);
}
}
2: Merge two lists using the Stream class
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;
class Main {
public static void main(String[] args) {
// create first list
// asList() converts the array into the arraylist
List<Integer> prime = new ArrayList<>(Arrays.asList(2, 3, 5));
System.out.println(“First List: ” + prime);
// create second list
List<Integer> even = new ArrayList<>(Arrays.asList(4, 6));
System.out.println(“Second List: ” + even);
// convert both lists into stream
Stream<Integer> list1 = prime.stream();
Stream<Integer> list2 = even.stream();
// merge two streams
Stream<Integer> merged = Stream.concat(list1, list2);
// convert the merged stream into list
List<Integer> numbers = merged.collect(Collectors.toList());
System.out.println(“Merged List: ” + numbers);
}
}
