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Java Exercises: Rotate an array of integers in left direction

Java Basic: Exercise-79 with Solution

Write a Java program to rotate an array (length 3) of integers in left direction.
Test Data: {20, 30, 40}
Expected output: {30, 40, 20}

Sample Solution:

Java Code:

import java.util.Arrays; 
 public class Exercise79 {
 public static void main(String[] args)
 {
    int[] array_nums = {20, 30, 40};
	System.out.println("Original Array: "+Arrays.toString(array_nums)); 
	int[] new_array_nums = {array_nums[1], array_nums[2], array_nums[0]};
	System.out.println("Rotated Array: "+Arrays.toString(new_array_nums)); 	 
 }
}

Sample Output:

Original Array: [20, 30, 40]                                           
Rotated Array: [30, 40, 20] 

Pictorial Presentation:

Java exercises: Rotate an array of integers in left direction

Flowchart:

Flowchart: Java exercises: Rotate an array of integers in left direction

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()));
}

Ref: https://bit.ly/3xXcFZt