Question

What is a class? Give an example, create a class

What is a Method? Give an example, create a method

Give an example of a Get Method

Give an example of a method with a return

What is a constructor? Create a constructor . Demonstrate that you understand class, and methods with a clear illustration.

Answer 1

Class:

A class is a blueprint or prototype from which objects are created

• it is a template for creating objects.
• it represents the set of properties or methods that are common to all objects of one type.

Syntax

        class <class_name>{  
             field;  
             method;  
          }  

Method:

A method is a block of code which only runs when it is called.

We can pass data, known as parameters, into a method.

return-type method-name parameter-list publicint max (int x, int y) { if (x> y) r modifier body of the method return x; else return y }

Method with void return type means it doesn't return nothing to caller.

Syntax:

  static void myMethod() {
// code to be executed
}

Method with return type means it return something to caller with the help of return keyword.

Syntax:

   static int myMethod() {
// code to be executed

return 0;
}

Get Method:

  The get method returns the variable value also called as Accessor methods

Syntax:

  public class Person {
private String name; // private = restricted access

// Getter
public String getName() {
return name;
}

// Setter
public void setName(String newName) {
this.name = newName;
}
}

constructor:

A constructor is a block of codes similar to the method. which is is used to initialize the object.

• It is called when an instance of the class is created. At the time of calling constructor, memory for the object is allocated in the memory.
• Every time an object is created using the new() keyword, at least one constructor is called.
• It calls a default constructor if there is no constructor available in the class. In such case, Java compiler provides a default constructor by default.
• There are two types of constructors in Java: no-arg constructor, and parameterized constructor.

Rules for creating Java constructor:

1. Constructor name must be the same as its class name
2. A Constructor must have no explicit return type
3. A Java constructor cannot be abstract, static, final, and synchronized.

syntax:

  class Bike1{  

//creating a default constructor  

Bike1()

{

System.out.println("Bike is created");

}  

//main method  

public static void main(String args[]){  

//calling a default constructor  

Bike b=new Bike();  

}  

}