कार्यान्वयन

import java.nio.file.*;import java.io.*;
public class Main {
  public static void main(String[] args) {
    Path log = Paths.get("app.log");
    try (BufferedReader br = Files.newBufferedReader(log)) {
      String line;
      while ((line = br.readLine()) != null) {
        System.out.println(line);
      }
    } catch (IOException e) {
      System.out.println("Error: " + e.getMessage());
    }
  }
}

import java.nio.file.*;import java.io.*;
public class Main {
  public static void main(String[] args) {
    Path log = Paths.get("app.log");
    int errors = 0;
    try (BufferedReader br = Files.newBufferedReader(log)) {
      String line;
      while ((line = br.readLine()) != null) {
        if (line.contains("ERROR")) {
          errors++;
        }
      }
      System.out.println("Total errors: " + errors);
    } catch (IOException e) {
      System.out.println("Error: " + e.getMessage());
    }
  }
}

import java.nio.file.*;import java.io.*;
public class Main {
  public static void main(String[] args) {
    Path log = Paths.get("app.log");
    int errors = 0, warnings = 0;
    try (BufferedReader br = Files.newBufferedReader(log)) {
      String line;
      while ((line = br.readLine()) != null) {
        if (line.contains("ERROR")) errors++;
        if (line.contains("WARN")) warnings++;
      }
      System.out.println("Errors: " + errors);
      System.out.println("Warnings: " + warnings);
    } catch (IOException e) {
      System.out.println("Error: " + e.getMessage());
    }
  }
}