Java Collection, ArrayList Exercises: Swap two elements in an array list
Java Collection, ArrayList Exercises: Exercise-14 with Solution
Write a Java program of swap two elements in an array list.
Pictorial Presentation:

Sample Solution:-
Java Code:
import java.util.ArrayList;
import java.util.Collections;
public class Exercise14 {
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("Array list before Swap:");
for(String a: c1){
System.out.println(a);
}
//Swapping 1st(index 0) element with the 3rd(index 2) element
Collections.swap(c1, 0, 2);
System.out.println("Array list after swap:");
for(String b: c1){
System.out.println(b);
}
}
}
Sample Output:
Array list before Swap: Red Green Black White Pink Array list after swap: Black Green Red White Pink
Flowchart:

Java Code Editor:
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Next: Join two array lists.
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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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