Term
When you instantiate an object from a class, ____ is reserved for each instance variable (field) in the class.
Answer
A. a signature
B. a field name
C. a constructor
D. memory |
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Definition
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Term
A(n) ____ constructor is one that requires no arguments.
Answer
A. class
B. explicit
C. default
D. write |
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Definition
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Term
Methods that retrieve values are called ____ methods.
Answer
A. class
B. accessor
C. static
D. mutator |
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Definition
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Term
If a class’s only constructor requires an argument, you must provide an argument for every ____ of the class that you create.
Answer
A. Object
B. parameter
C. Type
D. Method |
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Definition
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Term
Which of the following is NOT an actual parameter?
Answer
A. Constant values used in a method call
B. Variables defined in a method heading
C. Expressions used in a method call
D. Variables used in a method call |
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Definition
| D. Variables used in a method call |
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Term
Given the method heading below, which of the following would be an incorrect demonstration of method overloading?
int larger(int x, int y)
Answer
A. int larger(int x, int y, int z)
B. double larger(double x, double y)
C. int larger(int a, int b)
D. char larger(char x, char y, char z) |
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Definition
| C. int larger(int a, int b) |
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Term
Given the method heading below, which of the following does NOT demonstrate method overloading?
int larger(int x, int y)
Answer
A. int larger(int x, int y, int z)
B. int larger(char x)
C. double larger(double x, double y)
D. int max(int x, int y) |
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Definition
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Term
Based on the code below, which of the following identifiers is visible in block three?
public class ScopeRules //Line 1
{
static final double rate = 10.50;
static int z;
static double t;
public static void main(String[]args) //Line 7
{
int num;
double x, z;
char ch;
// main block...
}
public void one(int f, char g) //Line 15
{
// block one...
}
public static int w; //Line 20
public void two(int one, int i) //Line 22
{
char ch;
int a; //Line 25
//block three
{
int z = 12; //Line 29
//...
}//end block three
// block two... //Line 32
}
}
Answer
A. z (before main)
B. x (one’s formal parameter)
C. local variables of main
D. t (before main) |
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Definition
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Term
Based on the code below, which of the following identifiers is NOT visible in method two?
public class ScopeRules //Line 1
{
static final double rate = 10.50;
static int z;
static double t;
public static void main(String[]args) //Line 7
{
int num;
double x, z;
char ch;
// main block...
}
public void one(int f, char g) //Line 15
{
// block one...
}
public static int w; //Line 20
public void two(int one, int i) //Line 22
{
char ch;
int a; //Line 25
//block three
{
int z = 12; //Line 29
//...
}//end block three
// block two... //Line 32
}
}
Answer
A. w (before method two)
B. one (method name)
C. rate (before main)
D. x (variable in block three) |
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Definition
| D. x (variable in block three) |
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Term
When they have the same name, variables within ____ of a class hide instance variables.
Answer
A. fields
B. packages
C. statements
D. methods |
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Definition
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Term
Based on the code below, where is identifier z (block three’s local variable) visible?
public class ScopeRules //Line 1
{
static final double rate = 10.50;
static int z;
static double t;
public static void main(String[]args) //Line 7
{
int num;
double x, z;
char ch;
// main block...
}
public void one(int f, char g) //Line 15
{
// block one...
}
public static int w; //Line 20
public void two(int one, int i) //Line 22
{
char ch;
int a; //Line 25
//block three
{
int z = 12; //Line 29
//...
}//end block three
// block two... //Line 32
}
}
Answer
A. In block three only
B. In block three and main
C. In two and block three
D. In one and block three |
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Definition
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Term
Given the class definition below, which of the following statements would you use to declare a new reference variable of the type Illustrate and instantiate the object with a value of 9?
public class Illustrate
{
private int x;
private static int y;
public static int count;
public static int z;
public Illustrate()
{
x = 1;
}
public Illustrate(int a)
{
x = a;
}
public void print()
{
System.out.println("x = " + x + ", y = "
+ y + ", count = " + count);
}
public static void incrementY()
{
y++;
}
}
Answer
A. Illustrate.illObject(9);
B. Illustrate illObject(9);
C. Illustrate illObject = new Illustrate(9);
D. illObject = Illustrate(9); |
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Definition
| C. Illustrate illObject = new Illustrate(9); |
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Term
Which of the following class definitions is correct in Java?
// Example (i)
public class Student
{
private String name;
private double gpa;
private int id;
public void Student()
{
name = "";
gpa = 0;
id = 0;
}
public void Student(String s, double g, int i)
{
set(s, g, i);
}
public void set(String s, double g, int i)
{
name = s;
gpa = g;
id = i;
}
public void print()
{
System.out.println(name + " " + id + " " + gpa);
}
}
// Example (ii)
public class Student
{
private String name;
private double gpa;
private int id;
public Student()
{
name = "";
gpa = 0;
id = 0;
}
public Student(String s, double g, int i)
{
set(s, g, i);
}
public void set(String s, double g, int i)
{
name = s;
gpa = g;
id = i;
}
public void print()
{
System.out.println(name + " " + id + " " + gpa);
}
}
Answer
A. Only (i)
B. Only (ii)
C. Both (i) and (ii)
D. None of these |
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Definition
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Term
Based on the class definition below, which of the following statements is illegal?
public class Illustrate
{
private int x;
private static int y;
public static int count;
public static int z;
public Illustrate()
{
x = 1;
}
public Illustrate(int a)
{
x = a;
}
public void print()
{
System.out.println("x = " + x + ", y = "
+ y + ", count = " + count);
}
public static void incrementY()
{
y++;
}
}
Answer
A. Illustrate.count++;
B. Illustrate.z++;
C. Illustrate.incrementY();
D. Illustrate.x++; |
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Definition
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