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1Z0-811 Java Basics and Syntax Practice Question
Arrange the steps to use the Scanner class to read user input in Java in the correct order.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
1. Import java.util.Scanner; 2. Create Scanner object: Scanner sc = new Scanner(System.in); 3. Prompt user: System.out.print("Enter value: "); 4. Read input: String input = sc.nextLine(); 5. Close scanner: sc.close();
First import Scanner, then create an instance, prompt user, read input, and finally close the scanner.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
1. Import java.util.Scanner; 2. Create Scanner object: Scanner sc = new Scanner(System.in); 3. Prompt user: System.out.print("Enter value: "); 4. Read input: String input = sc.nextLine(); 5. Close scanner: sc.close();
Why this is correct
This order follows the required sequence: import first to make the class available, then instantiate the Scanner with System.in, prompt the user, read the input, and finally close the scanner to release resources. It ensures the Scanner is ready and used correctly.
- ✗
1. Create Scanner object: Scanner sc = new Scanner(System.in); 2. Import java.util.Scanner; 3. Prompt user: System.out.print("Enter value: "); 4. Read input: String input = sc.nextLine(); 5. Close scanner: sc.close();
Why it's wrong here
This order is wrong because the import statement must come before any usage of the Scanner class. Without importing, the compiler will not recognize Scanner, causing a compilation error.
- ✗
1. Import java.util.Scanner; 2. Prompt user: System.out.print("Enter value: "); 3. Create Scanner object: Scanner sc = new Scanner(System.in); 4. Read input: String input = sc.nextLine(); 5. Close scanner: sc.close();
Why it's wrong here
Although the import is correct, prompting the user before creating the Scanner object is illogical because you cannot read input without the Scanner. The prompt can be placed after creation, but it's more natural to prompt after having the Scanner ready. More importantly, the creation must precede the read operation.
- ✗
1. Import java.util.Scanner; 2. Create Scanner object: Scanner sc = new Scanner(System.in); 3. Read input: String input = sc.nextLine(); 4. Close scanner: sc.close(); 5. Prompt user: System.out.print("Enter value: ");
Why it's wrong here
This order is incorrect because the prompt should appear before reading input, not after. If you prompt after reading, the user won't see the prompt, and the program may appear to hang or behave unexpectedly. Also, closing before prompting makes no sense.
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