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Classes Basics Quiz
By Mickey Arnold
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Last updated almost 2 years ago
10 questions
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Question 1
1.
How many instance variables are there in class It?
public class It
{
private int val;
}
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Question 2
2.
How many methods are there in class It?
public class It
{
private int val;
public It()
{
val = 7;
}
public int getIt()
{
return val;
}
}
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Question 3
3.
How many constructors are there in class It?
public class It
{
private int val;
public It()
{
val = 7;
}
public int getIt()
{
return val;
}
}
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1
2
3
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Question 4
4.
How many accessor methods are there in class It?
public class It
{
private int val;
public It()
{
val = 7;
}
public int getIt()
{
return val;
}
}
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1
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3
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Question 5
5.
What is output by the code below?
public class Check
{
private int one, two, total;
public void setNums(int n1, int n2)
{
one = n1;
two = n2;
}
public void add()
{
total = one + two;
}
public int getTotal()
{
return total;
}
}
//code in the main of another class
Check test = new Check();
test.setNums(3,-6);
test.add();
out.println(test.getTotal());
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3
-3
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Question 6
6.
How many modifier / mutator methods are there in class Check?
public class Check
{
private int one, two, total;
public void setNums(int n1, int n2)
{
one = n1;
two = n2;
}
public void add()
{
total = one + two;
}
public int getTotal()
{
return total;
}
}
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4
3
1
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Question 7
7.
How many instance variables are there in class Check?
public class Check
{
private int one, two, total;
public void setNums(int n1, int n2)
{
one = n1;
two = n2;
}
public void add()
{
total = one + two;
}
public int getTotal()
{
return total;
}
}
0
4
3
1
2
Question 8
8.
How many constructors are there in class Check?
public class Check
{
private int one, two, total;
public void setNums(int n1, int n2)
{
one = n1;
two = n2;
}
public void add()
{
total = one + two;
}
public int getTotal()
{
return total;
}
}
0
4
3
1
2
Question 9
9.
Consider the class and client code below.
public class Aplus
{
public double go( double a )
{
return a * 3;
}
public double fun( double b )
{
return b * 2;
}
}
//client code in another class
Aplus x = new Aplus();
System.out.println( x.go(2) );
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6.0
8.0
12.0
Question 10
10.
Consider the class and client code below.
public class Aplus
{
public double go( double a )
{
return a * 3;
}
public double fun( double b )
{
return b * 2;
}
}
//client code in another class
Aplus x = new Aplus();
System.out.println( x.fun(6) );
9.0
3.0
6.0
8.0
12.0