Java Compiler with Scanner Input

Examples included

• Run the scanner int example
• Run the scanner string example
• Run the scanner multiple example
• Run the scanner array example
• Run the buffered reader example
• Run the read until eof example

Practical tips

• After nextInt(), call sc.nextLine() to consume the leftover newline before reading text.
• For competitive programming and large inputs, prefer BufferedReader over Scanner — it's 5–10x faster.
• Each line of stdin should match what your program calls. Multiple nextInt() can read from the same line if separated by spaces.
• Use sc.hasNextInt() to safely loop until end of input.

Common questions

How do I provide input to a Java program online?

Type or paste your input into the "Custom Input (stdin)" panel below the editor before clicking Run.

Why does nextLine() skip my input?

It picks up the leftover newline from a previous nextInt(). Add an extra sc.nextLine() to consume it.

What's the difference between Scanner and BufferedReader?

Scanner is friendlier; BufferedReader is faster. For 100k+ inputs, BufferedReader is the right choice.