Beginner Quizzes – Java Classes And Objects

The following Java exercise(s) are designed for beginner level programmers. If the level is too hard, then I recommend reading my article about this topic, which offers a theoretical explanation including more exercises. Read More: Java Classes And Objects.

Article: Java classes and objects
Quizzes: Beginner  Intermediate  Advanced 

classes-and-objects-green

 

Quiz 1: Creating worker objects

What happens when the following program is compiled and run?

class Worker {

	String name;
	int age;
	double wage;

	Worker(String name, int age, double wage) {
		this.name = name;
		this.age = age;
	}
	public static void main(String[] args){
		Worker mc = new Worker("Peter",25,235.0);
		Worker mc2 = new Worker("Alan",64,434.0);
		Worker mc3 = new Worker("Emily",36,320.0);
		System.out.print(mc3.age + ", " + mc2.wage + ", " + mc2.name);
	}
}

Select the correct answer.



Please, leave your questions, feedback and suggestions in the comments below! If you need more explanation by any of the answers, just let me know to update it for you!

Quiz 2: Object instantiation

What happens when the following program is compiled and run?

public class MyClass {

    int m = 2;
    int n = 3;
    String s = "b";

    MyClass(int m, int n, String s) {
        this.n = n;
        this.s = s;
        System.out.print("-"+m+"-"+n+"-"+s);
    }
    void method(int m, int n, String s) {
        this.m = m;
        this.n = n;
        this.s = s;
    }
    public static void main(String[] args) {
        MyClass mc = new MyClass(4, 6, "h");
        mc.method(7, 9, "w");
    }
}

Select the correct answer.



Please, leave your questions, feedback and suggestions in the comments below! If you need more explanation by any of the answers, just let me know to update it for you!

Megisoft.com offers a practical method to learn and improve your Java skills. It avoids unnecessary long boring theoretical explanations, but it uses many exercises and quizzes. The author of Megisoft is Sar Maroof who has more than a decade of experience with web development mainly with Java, MySql, HTML and more..
Article: Java classes and objects
Quizzes: Beginner  Intermediate  Advanced 

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