Java samples

Environment setup

http://www.codejava.net/java-core/how-to-write-compile-and-run-a-hello-world-java-program-for-beginners

Sample 1

  • Read a file line by line
  • Split that line to find a string
  • Compare that string with the string users has inputted
  • Result
    filename.txt

    [html]
    Southern Cross Station^1^3501^Spencer Street^Melbourne
    William Street^3^3503^Collins Street^Melbourne
    Elizabeth Street^5^3505^Collins Street^Melbourne
    [/html]

    Tram.java

    [java]
    import java.util.Scanner;
    import java.io.IOException;
    import java.io.File;
    import java.io.BufferedReader;
    import java.io.FileReader;

    public class Tram {
    public static void main(String[] args) {

    // Print out ‘Enter filename’
    System.out.println("Enter filename >> ");
    Scanner scanner = new Scanner(System.in);
    String fileName = scanner.nextLine();

    // Print out ‘Enter tram tracker id’
    System.out.println("Enter tram tracker id >> ");
    String trackerId = scanner.nextLine();

    // Get folder path
    String dir = System.getProperty("user.dir");
    String filePath = dir + "\\" + fileName;
    System.out.println(filePath);

    // Check if file exist or not
    File file = new File(filePath);
    if(!file.exists() || file.isDirectory()) {
    // do something
    System.out.println("File not found");
    } else
    {
    // Read the file line by line
    try (BufferedReader br = new BufferedReader(new FileReader(filePath))) {
    String line;
    Boolean isFound = false;
    while ((line = br.readLine()) != null) {
    String[] sections = line.split("\\^");
    String trackerIdFound = sections[2];
    if (trackerId.equals(trackerIdFound)) {

    // Found trackerId
    isFound = true;
    System.out.println("Tracker id: " + trackerId);
    System.out.println("Stop number: " + sections[1]);
    System.out.println("Road: " + sections[3]);
    System.out.println("Cross Street: " + sections[0]);
    System.out.println("Suburb: " + sections[4]);

    break;
    }
    }

    if (isFound == false) {
    System.out.println("That tracker id was not found");
    }
    } catch (IOException e) {
    e.printStackTrace();
    }
    }
    }
    }

    [/java]

Be the first to comment

Leave a Reply

Your email address will not be published.


*