Скачать или смотреть Difference Between Final, Finally, Finalize()

Used to declare constants, prevent method overriding, or stop class inheritance.
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final int x = 10; // x cannot be reassigned

final class Vehicle {
// This class cannot be extended
}

class Car {
final void start() {
System.out.println("Engine starts");
}
}
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Used in exception handling to execute code regardless of whether an exception occurs.
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try {
int result = 10 / 0;
} catch (ArithmeticException e) {
System.out.println("Error: Division by zero");
} finally {
System.out.println("Cleanup code runs always");
}
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A method that runs before an object is garbage collected. Deprecated in modern Java.
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public class FinalizeDemo {
@Override
protected void finalize() throws Throwable {
System.out.println("Object is being garbage collected");
}

public static void main(String[] args) {
FinalizeDemo obj = new FinalizeDemo();
obj = null;
System.gc(); // Suggest garbage collection
}
}
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