Java to read csv file

This example show how to read csv file using Java.

Prepare:
- Create a spreadsheet:

- Export as csv file:

- The exported csv file in text format:

Using java to read the csv file and print the content:

package javareadcsv;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * @web http://java-buddy.blogspot.com/
 */
public class JavaReadCSV {
    
    static String CsvFile = "/home/buddy/test/test.csv";
    static String FieldDelimiter = ",";

    public static void main(String[] args) throws IOException {
        BufferedReader br;
        
        try {
            br = new BufferedReader(new FileReader(CsvFile));
            
            String line;
            while ((line = br.readLine()) != null) {
                String[] fields = line.split(FieldDelimiter, -1);
                System.out.print(fields.length + "-");
                for(String s : fields){
                    System.out.print(s);
                    System.out.print(":");
                }
                System.out.println();
            }
            
        } catch (FileNotFoundException ex) {
            Logger.getLogger(JavaReadCSV.class.getName())
                    .log(Level.SEVERE, null, ex);
        }
        
    }
    
}

To display the content with JavaFX TableView, read next post.

Java example using Supplier to get input from Scanner

Java example using java.util.function.Supplier to get input from java.util.Scanner.

JavaSupplier.java

package javasupplier;

import java.util.Scanner;
import java.util.function.Supplier;
import java.util.stream.Stream;

public class JavaSupplier {

    public static void main(String[] args) {
        Supplier<String> msg  = ()-> "http://java-buddy.blogspot.com/";
        System.out.println(msg.get());
        System.out.println();
        
        Scanner scanner = new Scanner(System.in);
        Supplier<String> scannerNext = () -> scanner.next();
        System.out.println("Enter something, 'q' to quit");
        
        Stream.generate(scannerNext)
                .map(s -> {
                    System.out.println(s);
                    return s;
                })
                .allMatch(s -> !"q".equals(s));
    }
    
}

Get my MAC address using NetworkInterface

Java example to get MAC address using NetworkInterface:

package javamyip;

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Collections;
import java.util.Enumeration;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * @web http://java-buddy.blogspot.com/
 */
public class JavaMyIP {

    public static void main(String[] args) {
        displayMyIP();
    }
    
    static void displayMyIP(){
        Enumeration<NetworkInterface> nets;
        try {
            nets = NetworkInterface.getNetworkInterfaces();
            for (NetworkInterface netint : Collections.list(nets)){
                System.out.printf(netint.getDisplayName() +"\n");
                Enumeration<InetAddress> inetAddresses = netint.getInetAddresses();
                for (InetAddress inetAddress : Collections.list(inetAddresses)) {
                    System.out.printf("InetAddress: %s\n", inetAddress);
                }
                
                byte[] mac = netint.getHardwareAddress();
                if(mac != null){
                    StringBuilder macAddr = new StringBuilder();
                    for (int i = 0; i < mac.length; i++) {
                        macAddr.append(String.format("%02X%s", mac[i], (i < mac.length - 1) ? ":" : "")); 
                    }
                    System.out.printf("Hardware address (MAC): [%s]\n", macAddr.toString());
                }
                
                System.out.printf("\n");
            }
        } catch (SocketException ex) {
            Logger.getLogger(JavaMyIP.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
}