The final modifier is used to mark a class final so that it cannot be extended, to prevent a method being overridden, and to prevent changing the value of a variable. Arguments of a method if declared as final is also can not be modified within the method.
package org.kodejava.basic;
public class FinalExample {
// breed is declared final.
// can't change the value assigned to breed
public final String breed = "pig";
private int count = 0;
public static void main(String[] args) {
FinalExample fe = new FinalExample();
// assign a value to breed variable will cause a
// compile-time error
//
// fe.breed = "dog";
int number = fe.count(20);
}
// sound() method is declared final, so it can't be overridden
public final void sound() {
System.out.println("oink oink");
}
// number parameter is declared final. can't change the value
// assigned to number
public int count(final int number) {
// assign a value to number variable will cause a
// compile-time error
//
// number = 1;
count = +number;
return count;
}
}
final class SubFinalExample extends FinalExample {
// try to override sound() method of superclass will cause a
// compile-time error
//
// public void sound() {
// System.out.println("oink");
// }
}
// try to inherit a class that declared final will cause a
// compile-time error
//
class OtherFinalExample extends SubFinalExample {
}
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A programmer, recreational runner and diver, live in the island of Bali, Indonesia. Programming in Java, Spring, Hibernate / JPA. You can support me working on this project, buy me a cup of coffee ☕ every little bit helps, thank you 🙏
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