Java Programming - Declarations and Access Control - Discussion

(2) sounds correct as in the example below

class CoffeeCup { 
    private int innerCoffee; 
    public CoffeeCup() { 
   } 
  
    public void add(int amount) { 
    innerCoffee += amount; 
   } 
   //... 
 } 

(3) is correct. The Java compiler generates at least one instance initialisation method for every class it compiles. In the Java class file, the instance initialisation method is named "<init>." For each constructor in the source code of a class, the Java compiler generates one <init>() method. If the class declares no constructors explicitly, the compiler generates a default no-arg constructor that just invokes the superclass's no-arg constructor. As with any other constructor, the compiler creates an <init>() method in the class file that corresponds to this default constructor.

(5) is correct. The compiler creates a default constructor if you do not declare any constructors in your class.