Java Tutorial | KNOWe Platform

KNOWe Learning Module

Learn Java

Java fundamentals and object-oriented programming concepts for building robust applications.

Start Learning Jump to Mini Project

Why Learn Java?

Object Oriented

Learn classes, objects, inheritance, and polymorphism.

Widely Used

Enterprise software, Android development, and backend systems.

Java Syntax

Java code runs inside classes and starts from the main method. Try it yourself!

Try Java Code

Output

Variables

Java requires a data type before each variable name. Try them!

Data Types

Common Java types include int, double, char, boolean, and String.

If...Else Conditions

Conditional statements choose between different actions. Try different marks!

Loops in Java

Loops repeat a block of code. Try for and while loops!

OOP Basics: Classes and Objects

Classes are blueprints and objects are created from them.

class Course {
    String name;
    int duration;
    String instructor;
    
    // Constructor
    Course(String name, int duration, String instructor) {
        this.name = name;
        this.duration = duration;
        this.instructor = instructor;
    }
    
    void displayInfo() {
        System.out.println("Course: " + name);
        System.out.println("Duration: " + duration + " weeks");
        System.out.println("Instructor: " + instructor);
        System.out.println("---");
    }
}

class Student {
    String name;
    int age;
    Course enrolledCourse;
    
    Student(String name, int age, Course course) {
        this.name = name;
        this.age = age;
        this.enrolledCourse = course;
    }
    
    void showDetails() {
        System.out.println("Student: " + name);
        System.out.println("Age: " + age);
        System.out.println("Enrolled in: " + enrolledCourse.name);
    }
}

class Main {
    public static void main(String[] args) {
        Course javaCourse = new Course("Java Programming", 8, "Prof. Sharma");
        Course pythonCourse = new Course("Python Basics", 6, "Dr. Mehta");
        
        javaCourse.displayInfo();
        pythonCourse.displayInfo();
        
        Student student1 = new Student("Riya", 20, javaCourse);
        Student student2 = new Student("Aman", 22, pythonCourse);
        
        student1.showDetails();
        student2.showDetails();
    }
}

🎯 Mini Project: Student Grade Management System

class Student {
    String name;
    int marks;
    String subject;
    
    Student(String name, int marks, String subject) {
        this.name = name;
        this.marks = marks;
        this.subject = subject;
    }
    
    String calculateGrade() {
        if (marks >= 90) return "A+ (Outstanding)";
        else if (marks >= 80) return "A (Excellent)";
        else if (marks >= 70) return "B (Very Good)";
        else if (marks >= 60) return "C (Good)";
        else if (marks >= 40) return "D (Pass)";
        else return "F (Fail)";
    }
    
    String getStatus() {
        return marks >= 40 ? "✅ PASS" : "❌ FAIL";
    }
    
    void displayReport() {
        System.out.println("━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━");
        System.out.println("📚 Student: " + name);
        System.out.println("   Subject: " + subject);
        System.out.println("   Marks: " + marks + "/100");
        System.out.println("   Grade: " + calculateGrade());
        System.out.println("   Status: " + getStatus());
    }
}

class Main {
    public static void main(String[] args) {
        System.out.println("═══════════════════════════════════════════");
        System.out.println("       STUDENT GRADE MANAGEMENT SYSTEM      ");
        System.out.println("═══════════════════════════════════════════\n");
        
        Student[] students = {
            new Student("Riya Sharma", 92, "Mathematics"),
            new Student("Aman Patel", 78, "Physics"),
            new Student("Priya Singh", 45, "Chemistry"),
            new Student("Rahul Verma", 35, "Biology"),
            new Student("Neha Gupta", 88, "Computer Science")
        };
        
        int totalMarks = 0;
        int passCount = 0;
        
        for (Student s : students) {
            s.displayReport();
            totalMarks += s.marks;
            if (s.marks >= 40) passCount++;
        }
        
        System.out.println("━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━");
        System.out.println("\n📊 CLASS SUMMARY:");
        System.out.println("   Total Students: " + students.length);
        System.out.println("   Class Average: " + (totalMarks / students.length) + "%");
        System.out.println("   Pass Percentage: " + (passCount * 100 / students.length) + "%");
        System.out.println("   Top Score: 92% (Riya Sharma)");
        System.out.println("\n✨ Grade system built with Java OOP!");
    }
}

Java Assessment

Test your understanding of Java fundamentals.

1. Java programs run inside:
Classes Images Tables

2. Which keyword is used for whole numbers in Java?
text int value

3. Java is an object-oriented programming language.
True False

Complete the quiz and click submit.

Learner Progress

Track completion of this Java module.

Course Progress0%

Intro & Why Java

Syntax & Variables

Data Types & Conditions

Loops & OOP Basics

Mini Project (Grade System)

Assessment Completed

Next Steps

✓ Revise the examples line by line and modify them
✓ Practice Java in an IDE (IntelliJ, Eclipse) or online compiler
✓ Try editing the mini project to add more features
✓ Continue to arrays, constructors, inheritance, and polymorphism
✓ Build a complete CRUD application with Java and databases