Immutable means, that class does not contain any method that would change it’s internal state. Example of immutable class: class ImmutableInteger { private final int value; public ImmutableInteger(int value) {this.value = value;} public int value() {return value;} public ImmutableInteger add(int a) { // instead of changing this state, we will create new instance with result … Read more
Short answer: Final: you cannot change the var after the declaration. Static: the variable is associated with a class not with instances private static int i=10; // belongs to the class private static final int j=10; // belongs to the class and it’s unchangeable private final int k = 10; // it’s unchangeable Long Answer: … Read more
If your fields are final, they must be set either on declaration or in the constructor. Once set, the compiler will throw an error when set again, because final variables are not allowed to be re-assigned. 2 solved Using a final variable in java and its implications on methods
Consider the following data set… DROP TABLE IF EXISTS results; CREATE TABLE results (id_competitor INT NOT NULL ,score INT NOT NULL ,id_route INT NOT NULL ,PRIMARY KEY(id_competitor,id_route) ); INSERT INTO results VALUES (1,100,2), (2,100,2), (3,60,2), (4 ,60,2), (1,70,1), (2,80,1), (3,70,1), (4,100,1); SELECT * FROM results; +—————+——-+———-+ | id_competitor | score | id_route | +—————+——-+———-+ | … Read more