String Constant Pool in Java

Java - symbolic constants

Last Updated : 14 May, 2023

In Java, a symbolic constant is a named constant value defined once and used throughout a program. Symbolic constants are declared using the final keyword.

Which indicates that the value cannot be changed once it is initialized.
The naming convention for symbolic constants is to use all capital letters with underscores separating words.

Syntax of Symbolic Constants

final data_type CONSTANT_NAME = value;

final: The final keyword indicates that the value of the constant cannot be changed once it is initialized.
data_type: The data type of the constant such as int, double, boolean, or String.
CONSTANT_NAME: The name of the constant which should be written in all capital letters with underscores separating words.
value: The initial value of the constant must be of the same data type as the constant.

Initializing a symbolic constant:

final double PI = 3.14159;

Example:

Java

// Java Program to print an Array
import java.io.*;
public class Example {
    public static final int MAX_SIZE = 10;

    public static void main(String[] args)
    {
        int[] array = new int[MAX_SIZE];

        for (int i = 0; i < MAX_SIZE; i++) {
            array[i] = i * 2;
        }

        System.out.print("Array: ");
        for (int i = 0; i < MAX_SIZE; i++) {
            System.out.print(array[i] + " ");
        }
        System.out.println();
    }
}

Output

Array: 0 2 4 6 8 10 12 14 16 18

String Constant Pool in Java

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