Java Array Exercises: Find all Pairs of elements in an array whose sum is equal to a specified number
Java Array: Exercise-22 with Solution
Write a Java program to find all pairs of elements in an array whose sum is equal to a specified number.
Pictorial Presentation:

Sample Solution:
Java Code :
public class Exercise22 {
static void pairs_value(int inputArray[], int inputNumber)
{
System.out.println("Pairs of elements and their sum : ");
for (int i = 0; i < inputArray.length; i++)
{
for (int j = i+1; j < inputArray.length; j++)
{
if(inputArray[i]+inputArray[j] == inputNumber)
{
System.out.println(inputArray[i]+" + "+inputArray[j]+" = "+inputNumber);
}
}
}
}
public static void main(String[] args)
{
pairs_value(new int[] {2, 7, 4, -5, 11, 5, 20}, 15);
pairs_value(new int[] {14, -15, 9, 16, 25, 45, 12, 8}, 30);
}
}
Sample Output:
Pairs of elements and their sum : 4 + 11 = 15 -5 + 20 = 15 Pairs of elements and their sum : 14 + 16 = 30 -15 + 45 = 30
Flowchart:

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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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