Intermediate quizzes – Java constructors

The following Java exercise(s) are designed for intermediate level programmers. If the level is too hard, then I recommend to select an easier one or you might consider reading my article about this topic, which offers a theoretical explanation including more exercises. Read More: Java Constructors

Quiz 1: Using constructors and the keyword “this” in Java.

What is written to the standard output as the result of executing the following code?

public class MyClass {

	int x = 3;
	int y = 5;

	MyClass() {
		x += 1;
		System.out.print("-x" + x);
	}
	MyClass(int i) {
		this();
		this.y = i;
		x += y;
		System.out.print("-x" + x);
	}
	MyClass(int i, int i2) {
		this(3);
		this.x -= 4;
		System.out.print("-x" + x);
	}
	public static void main(String[] args){
		MyClass mc1 = new MyClass(4,3);
	}
}

Select the correct answer.

a. This code is illegal at compile time.

b. This code is illegal at run time.

c. This code writes “-x3-x7-x3” to the standard output.

d. This code writes “-x4-x7-x3” to the standard output.

e. This code writes “-x4-x8-x4” to the standard output.

f. This code writes “-x4-x7-x4” to the standard output.

g. This code writes “-x4-x7-x2” to the standard output.

h. This code writes “null” to the standard output.

i. This code writes nothing to the standard output.

Article: Java constructors Quizzes: Beginner  Intermediate  Advanced

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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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