How many ways to initialize for final variable?
1. Initialize at the Declaration
You can initialize a final variable at the time of its declaration. This is the simplest way and ensures that the variable is assigned a value when it is created.
Example:
public class FinalVariableExample {
// Initialize final variable at the declaration
private static final int MAX_VALUE = 100;public static void main(String[] args) {
System.out.println(“MAX_VALUE: ” + MAX_VALUE);
}
}
2. Initialize in a Constructor
You can initialize a final variable within the constructor of the class. This allows you to assign a value to the final variable after the object is created but only once per object construction.
Example
public class FinalVariableExample {
private final int maxValue;// Constructor to initialize final variable
public FinalVariableExample(int value) {
this.maxValue = value;
}public void printMaxValue() {
System.out.println(“maxValue: ” + maxValue);
}public static void main(String[] args) {
FinalVariableExample example = new FinalVariableExample(200);
example.printMaxValue();
}
}
3. Initialize in a Static Block
For static final variables, you can initialize them within a static block. This block runs when the class is loaded, allowing complex initialization for static variables.
public class FinalVariableExample {
private static final int MAX_VALUE;// Static block to initialize static final variable
static {
MAX_VALUE = 300;
}public static void main(String[] args) {
System.out.println(“MAX_VALUE: ” + MAX_VALUE);
}
}
