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CAVITE STATE UNIVERSITY
T3 CAMPUS
Department of Information Technology COSC 65 – Programming Languages

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

Student Student1 = new Student(); // creating
Student Student2 = new Student(); // objects

Student1.displayCreation(); // displaying the values
Student2.displayCreation(); // of the object OUTPUT:
} 0 null
} 0 null

Explanation: In the above class, you are not creating any constructor so the compiler provides
you a default constructor. Here 0 and null values are provided by default constructor.
NOTE: CONTRUCTOR NAME MUST BE THE SAME AS ITS CLASS NAME. JUST ADD ().

Java Parameterized Constructor
A constructor which has a specific number of parameters is called a parameterized
constructor.

Why use the parameterized constructor?
The parameterized constructor is used to provide different values to the distinct
objects. However, you can provide the same values also.
Example of Parameterized Constructor

// Java program to demonstrate the use of parameterized constructor
class Student { // this is the class
int ID;
String Name;

Student (int id, String name) { // creating a parameterized constructor
ID = id;

Name = name;
}

void display(){ // method to display information
System.out.println(ID + “ “ + Name);
}
public class TestStudent { // main class (TestStudent.java)
public static void main(String[]args){
Student Student1 = new Student(111, “Chan”);
Student1.display();
} // no need to separate Student Student1 = new Student();
} // from Student1 = (111, “Chan”);

In using constructors, the code is more compressed to smaller portion than using objects and
classes.

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