extends SecurityManager : SecurityManager « Security « Java Tutorial

1. Java Tutorial
2. Security
3. SecurityManager

import java.io.IOException;

public class MainClass {
  public static void main(String args[]) throws IOException {
    System.setSecurityManager(new MySecurityManager());
  }
}

class MySecurityManager extends SecurityManager {
  public void checkRead(String file) {
    if (!(file.endsWith(".txt")) && !(file.endsWith(".java")) && !(file.endsWith(".class"))
        && !(file.startsWith("C:\\"))) {
      throw new SecurityException("No Read Permission for : " + file);
    }
  }
}