Practice Quiz: Console Input

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1 of 9

Question1
Which of the following is a method signature?
- a. return answer;
- b. if (value >= limit)
- c. public static void main(String[] args)
- d. String.length()
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2 of 9

Question2
Select all of the following statements that are NOT true about constructors.
- a. Constructors must be invoked using the new keyword.
- b. Constructors initialize objects, which are instances of a class.
- c. Constructors cannot have parameters.
- d. Constructors are methods that have the same name as their class.
- e. All classes have a constructor.
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3 of 9

Question3
Which of the following shows an object constructor being used?
- a. MyObject.new();
- b. MyObject.construct();
- c. new MyObject();
- d. construct MyObject;
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4 of 9

Question4
After using a Scanner, what clean up step should be taken?
- a. Call the Scanner.destroy() method to completely erase the Scanner from memory.
- b. Call Scanner.stop() to make sure the Scanner stops working with computer resources.
- c. No action needs to be taken.
- d. Call the Scanner.close() method to close the stream that the Scanner is reading from.
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5 of 9

Question5
Review the code below.
```
Scanner scanner = new Scanner(System.in);
```
System.in is an argument that is passed to the Scanner constructor.

What does Scanner do with this argument?
- a. The Scanner class needs a direction (in or out). Scanner can be used from a computer to read input from connected devices, and Scanner can also be used from within devices to send scanned data out to a computer.
- b. The Scanner class needs a stream to read from.
- c. The Scanner class needs the name of a file, which it uses to save images and PDFs from a scanner.
- d. The Scanner class needs a reference (port ID) to a connected scanning device that it can control.
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6 of 9

Question6
What does the Scanner class do in Java?
- a. A Scanner is a special built-in class that checks code for errors.
- b. A Scanner can continually "scan" for a condition, such as whether or not a key is currently pressed on the keyboard.
- c. The Scanner class allows Java to control scanner devices connected to the computer.
- d. Scanner is used to read data from streams, like System.in.
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7 of 9

Question7
What is the difference between Scanner.next() and Scanner.nextLine()?
- a. Scanner.next() requires an argument, like "number" or "word," and will return the next item that matches that description. Scanner.nextLine() will return the next line (characters up to the next line break).
- b. Scanner.next() will return the next token (characters up to the next space, such as a word or number), and Scanner.nextLine() will return the next line (characters up to the next line break).
- c. Scanner.next() and Scanner.nextLine() function identically. Having both of them available is easier for programmers to work with.
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8 of 9

Question8
Which of the following is NOT a method of the Scanner class?
- a. nextLine()
- b. nextDouble()
- c. nextString()
- d. nextInt()
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9 of 9

Question9
What is System.in? Choose all that apply.
- a. The static in field of the java.lang.System class. In other words, there is only one of them per program and it is always available by the name System.in. It doesn't need to be created with the new keyword.
- b. A way to check if a device is plugged into a specific physical port on a computer.
- c. A way to see what has been typed in the console.
- d. An instance of java.io.InputStream. In other words, it is a channel that input data can pass through, which allows the input data to be worked with.
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Practice Quiz: Console Input

Practice Quiz: Console Input

Practice Quiz: Console Input

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