Difference between the Constructors and Methods (original) (raw)

Last Updated : 16 Jun, 2026

In Java, constructors and methods are important components of a class that help in initializing objects and performing specific operations. A constructor is used to initialize an object when it is created, while a method defines the behavior and functionality of an object.

• Both constructors and methods improve code reusability and program organization.
• Java supports constructor and method overloading for multiple implementations.

Constructor

A constructor in Java is a special method used to initialize objects of a class. It is automatically called when an object is created and assigns initial values to object variables. Constructors help in setting up the initial state of an object.

• Constructor has the same name as the class and does not have a return type.
• It is automatically executed when an object is create

Syntax

class ClassName {
ClassName() {
// initialization code
}
}

Java `

import java.io.*;

class Geek { int num; String name;

// This would be invoked while an object
// of that class created.
Geek()
{
    System.out.println("Constructor called");
}

}

class GFG { public static void main(String[] args) { // this would invoke default constructor. Geek geek1 = new Geek();

    // Default constructor provides the default
    // values to the object like 0, null
    System.out.println(geek1.name);
    System.out.println(geek1.num);
}

}

`

Output

Constructor called null 0

Method

A method in Java is a block of code that performs a specific task or operation. Methods define the behavior of objects and help in improving code reusability. They execute only when they are called by the program.

• Methods contain a return type, method name, and parameters.
• They help in code reusability and modular programming.

Syntax

class ClassName {
returnType methodName(parameters) {
// method body
}
}

Java `

import java.io.*;

class Addition {

int sum = 0;

public int addTwoInt(int a, int b)
{

    // Adding two integer value.
    sum = a + b;

    // Returning summation of two values.
    return sum;
}

}

class GFG { public static void main(String[] args) {

    // Creating an instance of Addition class
    Addition add = new Addition();

    // Calling addTwoInt() method
    // to add two integer
    // using instance created
    // in above step.
    int s = add.addTwoInt(1, 2);

    System.out.println("Sum of two "
                       + "integer values: "
                       + s);
}

}

`

Output

Sum of two integer values: 3

Constructors Vs Methods