Beginner quizzes – Java constructors

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 Constructors

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Quiz 1: Java Constructors

What happens when you try to compile and run the following program?

public class MyConstructor {

	int x = 5;

	MyConstructor() {
		System.out.print("-x" + x);
	}
	MyConstructor(int x) {
		this();
		System.out.print("-x" + x);
	}
	public static void main(String[] args){
		MyConstructor mc1 = new MyConstructor(4);
		MyConstructor mc2 = new MyConstructor();
	}
}

Select the correct answer.


Quiz 2: Java Constructors, Student

What happens when you try to compile and run the following program?

public class Student {

	String name;
	int age;
	String phone;

	Student() {}
	Student(String name, int age, String phone) {
		this.phone = phone;
		this.name = name;
	}
	public static void main(String[] args){
		Student s1 = new Student();
		Student s2 = new Student("John",25,"029-998877");
		System.out.print(s2.name + ", " + s2.age + ", " + s2.phone);
	}
}

Select the correct answer.


Please, leave your questions, feedback and suggestions in the comments below!
SarMaroof.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.


Sar Maroof is graduated from HBO Amsterdam “higher professional education” when he already had a bachelor of science degree in Physics.
He is a SUN certified JSP as well as EJB. He has experience with Java since 2001 and worked for several big as well as small companies and later as a freelancer.
He is the author of Java quizmaster and Build a Java application in 7 days.

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