Java Collection, ArrayList Exercises: Join two array lists
Java Collection, ArrayList Exercises: Exercise-15 with Solution
Write a Java program to join two array lists.
Pictorial Presentation:

Sample Solution:-
Java Code:
import java.util.ArrayList;
import java.util.Collections;
public class Exercise15 {
public static void main(String[] args) {
ArrayList<String> c1= new ArrayList<String>();
c1.add("Red");
c1.add("Green");
c1.add("Black");
c1.add("White");
c1.add("Pink");
System.out.println("List of first array: " + c1);
ArrayList<String> c2= new ArrayList<String>();
c2.add("Red");
c2.add("Green");
c2.add("Black");
c2.add("Pink");
System.out.println("List of second array: " + c2);
// Let join above two list
ArrayList<String> a = new ArrayList<String>();
a.addAll(c1);
a.addAll(c2);
System.out.println("New array: " + a);
}
}
Sample Output:
List of first array: [Red, Green, Black, White, Pink] List of second array: [Red, Green, Black, Pink] New array: [Red, Green, Black, White, Pink, Red, Green, Black, Pink]
Flowchart:

Java Code Editor:
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Java: Tips of the Day
getEnumMap
Converts to enum to Map where key is the name and value is Enum itself.
public static <E extends Enum<E>> Map<String, E> getEnumMap(final Class<E> enumClass) { return Arrays.stream(enumClass.getEnumConstants()) .collect(Collectors.toMap(Enum::name, Function.identity())); }
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