Chapters 2-4 Test: Scanner and Methods
What is the output by the code below? System.out.print(12.7%3);
.7
What is the output by the code below? System.out.print(3/4);
0
What is the output by the code below? int x = 15; x = x % 5; System.out.print(x);
0
How many constructors are there in class It? public class It { private int myX; public It( ) { myX = 99; } public int getX( ) { return myX; } public String toString( ) { return "" + getX( ); } }
1
How many instance variables are there in class It? public class It { private int myX; public It( ) { myX = 99; } public String toString( ) { return "" + myX; } }
1
What is the output by the code below? System.out.print(4%3);
1
What is the output by the code below? System.out.print( (double)2/2);
1.0
What is the output by the code below? double x = 4/3 System.out.print(x);
1.0
What is the output by the code shown below? double x = 9.0; x = x+2; System.out.print(x);
11.0
What is the output? System.out.print(3 + 3 * 3);
12
What is the output by the code shown below? int x = 9; x = x + 3 * 2; System.out.print(x);
15
What is the output by the code below? int x = 20; x = x*2; System.out.print(x);
40
What is the output by the code below? char x = 'A'; System.out.print(x+3);
68
What is the output by the code below? int x = 7; x++; System.out.print(x);
8
Which of the following would correctly define and instantiate a Scanner?
Scanner kb = new Scanner(in);
Given the following statement, var must be defined as which of the following types? var = keyboard.nextLine( );
String
What is a method?
a tool that helps organize a program
Which of the following Scanner methods can be used to read in the value 45?
all of these
Given the following statement, var must be defined as which of the following types? var = keyboard.nextInt( );
int
Which of the following is a 32 bit data type?
int
Which of the following Scanner methods can be used to read in a String?
next( )
Which of the following Scanner methods can be used to read in a double?
nextDouble( )
Which of the following Scanner methods can be used to read in the value 52.245?
nextDouble( )
Which of the following Scanner methods can be used to read in the value comp sci is best?
nextLine( )
What is the output by the code below? public class CS { public void one( ) { System.out.print("one"); } } //code in the main of another class CS test = new CS( ); test.one( );
one
What is the output by the code below? public class CS { public void one( ) { System.out.print("one"); } } //code in the main of another class CS test = new CS( ); test.one( ); test.one( );
oneone
What is the output by the code below? public class CS { public void one( ) { System.out.print("one"); } public void two( ) { System.out.print("two"); } } //code in the main of another class CS test = new CS( ); test.one( ); test.two( ); test.one( );
onetwoone
What is the output by the code below? public class CS { public void one( ) { System.out.print("one"); } public void two( ) { System.out.print("two"); one( ); } } //code in the main of another class CS test = new CS( ); test.one( ); test.two( ); test.one( );
onetwooneone
Which of the following Graphics methods can be used to draw a filled Circle?
fillOval( )
Which of the following Graphics methods can be used to draw a filled Rectangle?
fillRect( )
What is the output by the code below? System.out.println(Math.round(5/2));
2
What is the output by the code below? int x = 8; x = x%3; System.out.print(x);
2
How many methods are there in class It? public class It { private int myX; public It( ) { myX = 99; } public int getX( ) { return myX; } public String toString( ) { return "" + getX( ); } }
2
What is the output by the code below? int x = 9; int y = 8; int z = x+y; double a = z; System.out.print(a);
17.0
How many accessor methods are there in class It? public class It { private int myX; public It( ) { myX = 99; } public int getX( ) { return myX; } public String toString( ) { return "" + getX( ); } }
2
What is the output by the code below? System.out.println(Math.pow(3,3));
27.0
What is the output by the code below? System.out.println(Math.round(8.6));
9
What is the output by the code below? System.out.println(Math.sqrt(81));
9.0
When writing a method, you must always have an open and close what?
A and B only
Which of the following Scanner methods can be used to read in the value compsciisbest?
A and B only next( ) and nextDouble( )