Constants

Constants are variables whose values cannot be changed after they are initialized. In Apex, you can create a constant by using the final keyword.

Example

// Declare a constant
final String ERROR_MESSAGE = 'An error has occurred.';

// The following line would cause a compile-time error:
// ERROR_MESSAGE = 'A new error.';

public class MyMath {
    public static final Decimal PI = 3.14159;
}

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