Simple JSON Handler in Java: Explanation & Practice

Problem summary

Read a simple JSON file and extract specific values.

Starter code

import java.io.*;

public class Main {
    public static void main(String[] args) {
        // Read simple JSON: {"name": "John", "age": 30}
        // Extract and print values
        // Print: Name: <name>, Age: <age>
    }
}

Expected output and test cases

• Extract values

  Name: John, Age: 30

• Different values

  Name: Alice, Age: 25

• Parse error

  Invalid JSON

Hints

1. Simple regex or string parsing
2. Find key, extract value after :
3. Remove quotes from strings

Related File I/O exercises

• Practice Config File Parser in Java
• Practice File Difference Checker in Java
• Practice CSV Parser in Java

Practice all File I/O exercises · Run this idea in the Java compiler