QUESTION 1 This and the next two questions are based on the following program: I

Question

QUESTION 1

This and the next two questions are based on the following program:

In the main method after the program has evaluated all statements before the comment, what is the value of x.length? _________

QUESTION 2

What is the value of r1?

null

0

2

3

QUESTION 3

What is the value of r2? _____

QUESTION 4

A UML class diagram has the following description about a member of the class:

+ getHeaderField(name:String):String

Which of the following is a correct declaration of the member in Java?

public String getHeaderField;

public String getHeaderField(String)

getHeaderField

public static String getHeaderField( name)

QUESTION 5

Note: all answers are case sensitive.

Inside a class, the declaration of a constructor looks like the following:

public JButton(String text)

1. From the constructor, you infer that the name of the class containing the constructor must be _______ .

2. Fill in the blanks so that the statement will instantiate a JButton object and assigns it to variable of JButton type:

JButton btn= _______ ("OK");

3. Fill in the blanks to complete the description of the constructor in the corresponding UML class diagram:

+<<constructor>>______( _____ : ______)

QUESTION 6

Are the methods in the following code correctly overloaded?

a. True

b. False

QUESTION 7

Assume the following class has been implemented:

In another class, you want to use the log method in Tool class. Which statement uses the method correctly?

double x

double x = log(2,8);

double x = Tool.log(2,8);

double X

QUESTION 8

Fill in the blanks to complete the following program.

QUESTION 9

Does the following code involve illegal duplication variable declarations?

a. True

b. False

null

0

2

3

Explanation / Answer

Question 1: 3
Question 2: 0
Question 3: 3
Question 4: b. public String getHeaderField(String)
Question 5:
1. JButton
2. JButton btn = new JButton("OK");
3. JButton(text: name)
Question 6:
a. True
Question 7: c. double x = Tool.log(2,8);
Question 8:
public class Car{
private String model;
private int year;

public Car(String model, int year) { //2-argument constructor
this.model = model;
this.year = year;
}

public Car(String model) {
Car(model, 2017); //call the 2-argument constructor
}
//getters and setters omitted for brevity.
}
Question 9:
b. False

**Comment for any further queries. Upvote if the answer is satisfactory.

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