🚀 Programming Example

Understanding the problem without this keyword, this keyword to refer current class instance variable.

👁 1,171 Views

💻 Practical Program

📘 Step Learning

Learn this program step-by-step with algorithm, source code, output and detailed explanation.

💻 Program Code

//Understanding the problem without this keyword
class StudentClass {

    int rollno;
    String name;
    float age;

    StudentClass(int rollno, String name, float age) {
        rollno = rollno;
        name = name;
        age = age;
    }

    void display() {
        System.out.println(rollno + " " + name + " " + age);
    }
}

class MainStudentClass {

    public static void main(String args[]) {
        StudentClass s1 = new StudentClass(1, "Rahim", 21.0f);
        StudentClass s2 = new StudentClass(2, "Ram", 21.5f);
        s1.display();
        s2.display();
    }
}
/* The this keyword can be used to refer current class instance
variable. If there is ambiguity between the instance variables
and parameters, this keyword resolves the problem of ambiguity. */

🖥 Program Output

0 null 0.0
0 null 0.0
Press any key to continue . . .

🎯 How to learn from this example

First understand the algorithm carefully. Then study the program line-by-line and compare it with the output. Finally, review the explanation section to strengthen your logic and programming understanding.

🔥 Practice suggestion

Rewrite the program without looking at the code. Modify values, conditions or logic and run it again. This helps improve confidence and strengthens coding skills much faster.

⚡ Quick Practice Flow

Follow this learning sequence for better understanding.

Read the topic carefully
Understand the algorithm
Study the code line-by-line
Check the output result
Practice by modifying logic