Question

How to create the multiple class in Java? Please elaborate it by using the example.

Answer 1

Java Code:

Output Snapshot:

Text Code:

// Class1 Declaration
class Class1 {
// Class1 Member Variable
int class1_variable;
  
    // Class1 Member Functions
public void add(int x, int y) {
class1_variable = x + y;
System.out.println("In Class 1 : Addition result: "+class1_variable);
}
public void sub(int x, int y) {
class1_variable = x - y;
System.out.println("In Class 1 : Subtraction result: "+class1_variable);
}
}

// Class2 Declaration
class Class2 {
// Class2 Member Variable
int class2_variable;
  
   // Class2 Member Functions
public void add(int x, int y) {
class2_variable = x + y;
System.out.println("In Class 2 : Addition result: "+class2_variable);
}
public void sub(int x, int y) {
class2_variable = x - y;
System.out.println("In Class 2 : Subtraction result: "+class2_variable);
}
}

// Main Class - Entry point of code
public class Main
{
   public static void main(String[] args) {
   // Creating object1 object of Class1
       Class1 object1 = new Class1();
       // Calling add() and sub() member function using object1
       object1.add(20,10);
       object1.sub(20,10);
      
       // Creating object2 object of Class1
       Class2 object2 = new Class2();
       // Calling add() and sub() member function using object1
       object2.add(30,20);
       object2.sub(30,20);
   }
}

Explanation:

• To create multiple class in Java, you need to declare each class independently before using it in the Main class.
• As to access class member variable and functions, object of the respective class is needed to be created, hence in the main class, object1 and object2 are created for Class1 and Class2 respectively.
• As the add() and sub() member function is accessed using object1 object, it invokes the function from the Class1 and similarly for object2.
• Please refer code comments for the understanding purpose.