Summary - Input and output

Combine Scanner, printf and BufferedReader to write an interactive menu.

Summary - Input and output

In this group you learned to read input with Scanner, produce formatted output with printf and read efficiently with BufferedReader. try-with-resources gave you a safe way to close resources.

Now you will combine everything to write a small interactive menu: read a number from the user and produce output based on the menu choice. This summary lesson has 5 steps and includes one code task.

Exercise Interactive menu

Read a number from the user with nextInt (1 or 2). Use switch to produce output based on the choice: for 1 print Seçim: 1%n with printf, for 2 print Seçim: 2%n. The user will type 1. Print the cue Seç: .

Show example solution

Scanner input = new Scanner(System.in);
System.out.print("Seç: ");
int choice = input.nextInt();
switch (choice) {
  case 1: System.out.printf("Seçim: 1%n"); break;
  case 2: System.out.printf("Seçim: 2%n"); break;
}

Test yourself

Which tool is most efficient for multi-line input?
- Scanner
- printf
- System.out
- BufferedReader
Show answer

BufferedReader — BufferedReader buffers lines, so it is faster for multi-line input.
Match each tool to its job

Scanner

Easy input
printf

Formatted output
BufferedReader

Fast reading
try-with-resources

Auto closing

Close the resource safely

try (Scanner input = new Scanner(System.____)) {
  String line = input.nextLine();
}

Show answer

try (Scanner input = new Scanner(System.in)) {
  String line = input.nextLine();
}

Next lesson: Declaring enums

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