Quiz 1

int x=5, y=20;

x+=32;

y/=4;

System.out.println("x="+x+", y="+y);

• x=32, y=4

• x=9, y=52

• x=37, y=5

• x=160, y=80

Every Java application program must have

• a class named MAIN

• a method named main

• comments

• integer variables

To print "Hello, world" on the moniter, use the following Java statement

• SystemOutPrintln("Hello, world");

• System.out.println{"Hello, world"}

• System.out.println("Hello, world");

• Print "Hello, world"

Predict the output?

final double x=99.0;

x=54.3;

System.out.println("x="+x);

• x=54.3

• x=99

• x=153.3

• Nothing, this is an error

Which of the following is a valid Java statement?

• String str='John Doe';

• string str="John Doe";

• string str='John Doe';

• String str="John Doe";

Which of the following does not describe a valid comments in Java?

• Single line comments, two forward slashes - //

• Multi-line comments, start with /* and end with */

• Multi-line comments, start with / and end with /

• Documentation comments, starting with /** and ending with */

Which of the following statements correctly creates a Scanner object for keyboard input?

• Scanner kbd = new Scanner(System.keyboard);

• Scanner keyboard = new Scanner(System.in);

• Scanner keyboard(System.in);

• Keyboard scanner =new Keyboard(System.in);

Which Scanner class method reads as int?

• readInt()

• nextInt()

• getInt()

• read_int()

Which Scanner class method reads a String?

• readString()

• getString()

• nextString()

• nextLine()

Which one of the following would you use to convert a string to a double?

• Byte.parseByte()

• Integer.parseInt()

• Long.parseLong()

• Double.parseDouble()