Advanced quizzes – Java arrays

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 Arrays

Quiz 1: A multi dimensional array

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

public class Seat {

	private int row;
	private int col;
	private String status; // f=free, o=occupied, r=registered
	Seat[][] hall = new Seat[3 + 1][2 + 1];

	Seat(int row, int col) {
		this.row = row;
		this.col = col;
		this.status = "f";
	}
	public void initializeHall(){
		for(int row = 1; row <= 3; row ++ ) {
			for(int col = 1; col <= 2; col ++ ) {
				hall[row][col] = new Seat(row,col);
				if(col > 1) {
					hall[row][col].status = "o";
				}
				if(row == 2) {
					hall[row][col].status = "r";
				}
			}
		}
	}
	public static void main(String[] args){
		Seat seat = new Seat(0,0);
		seat.initializeHall();
		for(int row = 1; row <= 3; row ++ ) {
			for(int col = 1; col <= 2; col ++ ) {
				System.out.print("-" + seat.hall[row][col].status);
			}
		}
	}
}

Select the correct answer.

a. This code is illegal at compile time.

b. This code is illegal at run time.

c. This code writes “-f-o-r-o-f-o” to the standard output.

d. This code writes “-f-o-r-o-f-o-f-o” to the standard output.

e. This code writes “-f-o-r-r-f-o” to the standard output.

f. This code writes “-f-o-o-r-o-o-f-o-o-f-o-o” to the standard output.

g. This code writes “-f-o-r-o-o-o” to the standard output.

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

i. This code writes nothing to the standard output.

Article: Java arrays 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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