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.

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.


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!
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Sar Maroof is the author of two Java books namely, Java quizmaster for beginners and A guide to build a Java application.
Experience with developing web applications since 2001
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Applied Science in Physics HBO Amsterdam
As well as Bachellor Science in Physics.
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