Advanced quizzes – Java classes and objects

The following Java exercise(s) are designed for advanced level developers. 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 Classes And Objects.

Quiz 1: Objects and methods

What happens when the following program is compiled and run?

public class MyClass {

	int a = 4;
	int b = 5;
	String s = "s";

	MyClass(int a, int b, String s) {
		this.a = this.a / 2 + a;
		System.out.print("-x" + a);
		this.s = "p";
		System.out.print("-x" + this.b);
		this.b += b;
	}
	void methodA(int m, int n, String s){
		a = this.a - m;
		b = this.b - n;
		s = this.s;
		System.out.print("-x" + a + "-x" + b + "-x" + s);
	}
	void methodB(int a, String s){
		this.a = this.a + a;
		this.s = "5";
	}
	public static void main(String[] args){
		MyClass mc = new MyClass(1,4,"h");
		mc.methodB(4,"k");
		mc.methodA(5,8,"w");
	}
}

Select the correct answer.

a - This code does not compile.

b - This method writes "-x1-x5-x2-x1-x5" to the standard output.

c - This method writes "-x1-x5-x3-x3-xs" to the standard output.

d - This method writes "-x1-x5-x3-x4-xs" to the standard output.

e - This method writes "-x1-x5-x5-x8-xw" to the standard output.

f - This method writes "-x1-x5-x2-x1-xk" to the standard output.

g - This method writes "-x1-x5-x2-x1-xh" to the standard output.

h - This method writes "-x1-x5-x2-x3-x5" to the standard output.

i - This method writes nothing to the standard output.

Article: Java classes and objects 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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