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  1. class Student {
  2.  
  3.     // Data members
  4.     int rollNo;
  5.     String name;
  6.     double marks;
  7.  
  8.     // 1. Default Constructor
  9.     Student() {
  10.         rollNo = 30;
  11.         name = "Vaishnavi";
  12.         marks = 85.3;
  13.     }
  14.  
  15.     // 2. Parameterized Constructor
  16.     // Parameter names are different from data member names
  17.     Student(int r, String n, double m) {
  18.         rollNo = r;
  19.         name = n;
  20.         marks = m;
  21.     }
  22.  
  23.     // 3. Constructor Overloading
  24.     Student(int r, String n) {
  25.         rollNo = r;
  26.         name = n;
  27.         marks = 0.0;
  28.     }
  29.  
  30.     // 4. Method Overloading - No parameter
  31.     void display() {
  32.         System.out.println("Roll No : " + rollNo);
  33.         System.out.println("Name    : " + name);
  34.         System.out.println("Marks   : " + marks);
  35.     }
  36.  
  37.     // Method Overloading - One parameter
  38.     void display(String message) {
  39.         System.out.println(message);
  40.         System.out.println("Roll No : " + rollNo);
  41.         System.out.println("Name    : " + name);
  42.     }
  43.  
  44.     // Method Overloading - Two parameters
  45.     void display(String message, boolean showMarks) {
  46.         System.out.println(message);
  47.         System.out.println("Roll No : " + rollNo);
  48.         System.out.println("Name    : " + name);
  49.  
  50.         if (showMarks) {
  51.             System.out.println("Marks   : " + marks);
  52.         }
  53.     }
  54. }
  55.  
  56. public class Main {
  57.  
  58.     public static void main(String[] args) {
  59.  
  60.         // Object using default constructor
  61.         Student s1 = new Student();
  62.  
  63.         // Object using parameterized constructor
  64.         Student s2 = new Student(31, "vaidehi", 83.5);
  65.  
  66.         // Object using overloaded constructor
  67.         Student s3 = new Student(32, "ravee");
  68.  
  69.         System.out.println("===== DEFAULT CONSTRUCTOR =====");
  70.         s1.display();
  71.  
  72.         System.out.println("\n===== PARAMETERIZED CONSTRUCTOR =====");
  73.         s2.display();
  74.  
  75.         System.out.println("\n===== CONSTRUCTOR OVERLOADING =====");
  76.         s3.display();
  77.  
  78.         System.out.println("\n===== METHOD OVERLOADING =====");
  79.  
  80.         s2.display();
  81.  
  82.         System.out.println();
  83.  
  84.         s2.display("Student Details:");
  85.  
  86.         System.out.println();
  87.  
  88.         s2.display("Complete Student Details:", true);
  89.     }
  90. }
Success #stdin #stdout 0.15s 55780KB
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Standard input is empty
stdout
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===== DEFAULT CONSTRUCTOR =====
Roll No : 30
Name    : Vaishnavi
Marks   : 85.3

===== PARAMETERIZED CONSTRUCTOR =====
Roll No : 31
Name    : vaidehi
Marks   : 83.5

===== CONSTRUCTOR OVERLOADING =====
Roll No : 32
Name    : ravee
Marks   : 0.0

===== METHOD OVERLOADING =====
Roll No : 31
Name    : vaidehi
Marks   : 83.5

Student Details:
Roll No : 31
Name    : vaidehi

Complete Student Details:
Roll No : 31
Name    : vaidehi
Marks   : 83.5
https://ideone.com/0bYiUL
language:
Java (12.0.1)
created:
1 hour ago
visibility:
public

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