Which of the following statements declares a variable? (Assume all statements ar

Question

Which of the following statements declares a variable? (Assume all statements are valid.)
/* 1 */ Oval dot = new Oval();
/* 2 */ dot.setColor(new Color(0, 0, 255));
/* 3 */ int dx = 120;
/* 4 */ dot.translate(dx, 0);
/* 5 */ dx = dx + 10;

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Question 20.05 pts

"The scope of this type of variable begins with its declaration inside a method and ends at the end of the block in which it is declared." What kind of variable is it?

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Question 30.05 pts

Which of the following statements are true?

A method may have no parameters.

A method may have one or more parameters.

A method may or may not return a value.

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Question 40.05 pts

Which of the following is the name of a reference type (object type) we have encountered this quarter?

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Question 50.05 pts

Which of the following is a method of a String object?

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Question 60.05 pts

The arguments of a method call must match the parameters of a method definition in what ways?

Mark all that are correct.

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Question 70.05 pts

What units are required when specifying an angle for the trigonometric methods (sin, cos, etc.)?

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Question 80.05 pts

If two methods within the same class have the same name, what do you have?

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Question 90.05 pts

What is the name given to a method that can be called using the name of its class, rather than an object reference, as a qualifier (for example, Math.round(...))?

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Question 100.05 pts

Which of the following is NOT true about class Scanner?

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Question 110.05 pts

Which of the following is the name of a local variable in the Strange class below?

public class Strange{

public static final int MAX = 5;

public static void unknown(){

int number = 0;

for (int i = MAX; i >= 1; i--)

number += i * i;

System.out.println(number);

}

public static void main(String[] a){

unknown();

}

}

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Question 120.05 pts

Which of the following is NOT a method of the Graphics object?

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Question 130.05 pts

Which of the following statements constructs an object?

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Question 140.05 pts

What is the correct syntax for declaring a class constant named BET_LIMIT?

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Question 150.05 pts

Which of the operators listed below has the highest precedence? (Be able to list all operators in order of precedence for the test.)

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Question 160.05 pts

Which of the following are primitive data types in Java (mark all correct answers).

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Question 170.05 pts

Which of the following is the name of a data type in Java? Mark all that apply. (Recall that every variable is declared using a data type to specify the kind of information that can be stored in the variable.)

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Question 180.05 pts

Enter the index value (a number) that identifies the first character in a String object.

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Question 190.05 pts

The abs() method in the Math class is an overloaded method. How many different versions are there?

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Question 200.05 pts

What is the proper way to instantiate a DrawingPanel object?

Explanation / Answer

(Q1)Which of the following statements declares a variable? (Assume all statements are valid.)

(Ans- )(C) 1 and 3 are correct.

(Q2)"The scope of this type of variable begins with its declaration inside a method and ends at the end of the block in which it is declared." What kind of variable is it?

(Ans- )(A) local variable

(Q3)Which of the following statements are true?

(Ans- )(D)I ,II and III are all true.

(Q4)Which of the following is the name of a reference type (object type) we have encountered this quarter?

(Ans- )(E)All of the above.

(Q5)Which of the following is a method of a String object?

(Ans-)(A)length

(Q6)The arguments of a method call must match the parameters of a method definition in what ways?

(Ans- )All are correct.

(Q7)What units are required when specifying an angle for the trigonometric methods (sin, cos, etc.)?

(Ans- )(B)radians

(Q8)If two methods within the same class have the same name, what do you have?

(Ans-)(A)overloaded method

(Q9)What is the name given to a method that can be called using the name of its class, rather than an object reference, as a qualifier (for example, Math.round(...))?

(Ans-)(C)Both of the above.

(Q10)Which of the following is NOT true about class Scanner?

(Ans- )(D)All of the Scanner methods return type String.

(Q11)Which of the following is the name of a local variable in the Strange class below?

(Ans- )(D) number.

(Q12)Which of the following is NOT a method of the Graphics object?

(Ans- )(A)getGraphics

(Q13)Which of the following statements constructs an object?

(Ans- )(E)All of the above statements construct objects.

(Q14)What is the correct syntax for declaring a class constant named BET_LIMIT?

(Ans- )(D)public static final int BET_LIMIT = 1000;

(Q15)Which of the operators listed below has the highest precedence?

(Ans- )(D)() (parentheses)

(Q16)Which of the following are primitive data types in Java (mark all correct answers).

(Ans- )(A),(C) and (D)

(Q17)Which of the following is the name of a data type in Java?

(Ans- )(A),(B) and (C)

(Q18)The abs() method in the Math class is an overloaded method. How many different versions are there?

(Ans- )(B)3

(Q19)What is the proper way to instantiate a DrawingPanel object?

(Ans- )(D)DrawingPanel dp = new DrawingPanel(500, 500);

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