JAVA PROGRAM • LEVEL 14 — FILE HANDLING & SERIALIZATION
Read a File with BufferedReader in Java
Learn read a file with bufferedreader in java with a complete, compiler-ready Java 17 example.
PROBLEM UNDERSTANDING
Input and expected output
No input required
Basics Loops Methods
COMPLETE JAVA 17 PROGRAM
Complete Java 17 implementation
import java.io.*;import java.nio.file.*;
class Main{public static void main(String[] args)throws Exception{Path path=Path.of("topics.txt");Files.writeString(path,"Basics\nLoops\nMethods\n");try(BufferedReader reader=Files.newBufferedReader(path)){String line;while((line=reader.readLine())!=null)System.out.println(line);}}}CURRENT STEP
Select Start to walk through the important lines.
SELECTED LINE
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EXPECTED OUTPUT FOR THE SAMPLE
Basics Loops Methods
PROGRAM EXPLANATION
Algorithm and explanation
- Read the sample input and convert it into the Java values required for read a file with bufferedreader in java.
- Apply BufferedReader and try-with-resources in the order shown by the program.
- Print the final result and compare it with the documented sample output.
This Java 17 example demonstrates BufferedReader and try-with-resources through a complete, executable program. The values are intentionally small so students can trace each statement, verify the output, and then modify the example safely in the online compiler.
EFFICIENCY
Time and space complexity
O(n)
O(1)
DEBUGGING CHECKLIST
Common mistakes
Keep the class name Main and the entry method signature public static void main(String[] args) when using the online compiler.
Check the loop boundary and update expression carefully to avoid skipping the final value or creating an infinite loop.
Java is case-sensitive, and every statement that requires a semicolon must end with one.