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

constructors-green

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.



Sar Maroof is a professional software development teacher, gives master classes and publishes technical articles. He is also an expert software developer and worked for several big as well as small companies and later as a freelancer.
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