Java Software Solutions Chapter 1 Review Question with Certified Solutions

Java Programming - Chapter 3 - Using
Methods, Classes, and Objects
Questions and Answers 100% Pass
What keyword is used to call a method on an object?


✔✔ The dot (`.`) operator.




How do you create an object from a class?


✔✔ `ClassName obj = new ClassName();`




What is the purpose of the `return` statement in a method?


✔✔ It sends back a value to the method caller.




How do you call a method named `display` inside the same class?


✔✔ `display();`




What keyword is used to create a class in Java?


✔✔ `class`




1

,How do you pass parameters to a method?


✔✔ By defining them inside the parentheses of the method, like `public void greet(String name)

{ }`




How do you return an integer from a method?


✔✔ By specifying `int` as the return type and using `return` inside the method.




What is the default constructor in Java?


✔✔ A constructor with no parameters that initializes an object.




What is an instance variable?


✔✔ A variable defined in a class that belongs to an object.




How do you create a method that accepts two integers and returns their sum?


✔✔ `public int add(int a, int b) { return a + b; }`




What is a constructor?


✔✔ A special method that is called when an object is created.

2

, What is a method in Java?


✔✔ A method is a block of code that performs a specific task and can be called when needed.




How do you define a method in Java?


✔✔ By using a return type, method name, and parentheses, like `public void myMethod() { }`




How do you define a constructor in Java?


✔✔ By using the class name as the method name without a return type.




What keyword is used to refer to the current object in Java?


✔✔ `this`




How do you access a class variable inside an instance method?


✔✔ Using `this.variableName`




Can a method return an object?


✔✔ Yes, a method can return an object of any class.




3