Readonly field in java

Readonly field in java

In Java, you can create a readonly (constant) field by using the final keyword. A final field can only be assigned a value once, typically during its declaration or within the constructor of the class. Once assigned, its value cannot be changed, making it effectively read-only.

Here's how you can declare a readonly field:

public class Example { // Declare a readonly field private final int readOnlyField; // Constructor to initialize the readonly field public Example(int value) { this.readOnlyField = value; } // Getter method to access the readonly field public int getReadOnlyField() { return readOnlyField; } public static void main(String[] args) { Example example = new Example(42); // Access the readonly field using the getter method int value = example.getReadOnlyField(); System.out.println("Value of readonly field: " + value); // Attempting to change the readonly field will result in a compilation error // example.readOnlyField = 100; // This will not compile } }

In this example, the readOnlyField is declared as private final int, which means it is a private integer field that cannot be modified after it is initialized. The value of the readOnlyField is set in the constructor and can be accessed using a getter method.

Attempting to modify the readOnlyField after it has been assigned a value will result in a compilation error, ensuring that it remains read-only throughout the object's lifetime.

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