Library

Classes Basics Quiz

By Mickey Arnold
Last updated 10 months ago
10 Questions

How many instance variables are there in class It?
public class It
{
private int val;
}

How many methods are there in class It?
public class It
{
private int val;
public It()
{
val = 7;
}
public int getIt()
{
return val;
}
}

How many constructors are there in class It?
public class It
{
private int val;
public It()
{
val = 7;
}
public int getIt()
{
return val;
}
}

How many accessor methods are there in class It?
public class It
{
private int val;
public It()
{
val = 7;
}
public int getIt()
{
return val;
}
}

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());

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;
}
}

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;
}
}

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;
}
}

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) );

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) );