asked on

Print array of objects

Hello

I am trying to print out the values of my array of objects. Been at it a couple of hours and I've decided to ask for help

public class DataBase1 {

int id;
String firstName;
String lastName;
String skill;
Boolean bool;

DataBase1(int id2, String name1, String name2, String skill2, boolean b){ //constructor
int id = id2;
firstName = name1;
lastName = name2;
skill = skill2;
bool = b;
}
public String toString(int id, String firstName, String lastName, String skill, boolean b){
return toString();
}
}
----------------------------------------------------------------------------------------------------------------------
public class Server {

public static void main(String[] args) {

int size = 5;
DataBase1 staff[] = new DataBase1[size];
staff[0] = new DataBase1(1, "John", "Doe", "Java", true);
staff[1] = new DataBase1(2, "John", "Doe", "Java", true);
staff[2] = new DataBase1(3, "John", "Doe", "Java", true);
staff[3] = new DataBase1(4, "John", "Doe", "Java", true);
staff[4] = new DataBase1(5, "John", "Doe", "Java", true);

for(int i = 0; i < staff.length; i++){
System.out.println(staff[i]);
}

System.out.println(Arrays.toString(staff));
}
}

ASKER CERTIFIED SOLUTION

krakatoa

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kevinb4940

ASKER

Hello

Thank you very much you have really helped. So i do not need to use a toString method??

kevinb4940

ASKER

Thanks again. If you have time I've been playing around with an arraylist also. How would I print this?

ArrayList<DataBase1> callDb = new ArrayList();
callDb.add(new DataBase1(1, "John Doe", "Java", true));
callDb.add(new DataBase1(2, "Jane Dee", "Php", true));
callDb.add(new DataBase1(3, "Jim Downs", "Js", true));
callDb.add(new DataBase1(4, "Jack Jones", "C#", true));
callDb.add(new DataBase1(5, "Jill Doods", "C++", false));

krakatoa

public class Server {

    public static void main(String[] args) {

        int size = 5;
        DataBase1 staff[] = new DataBase1[size];
        staff[0] = new DataBase1(1, "John", "Doe", "Java", true);
        staff[1] = new DataBase1(2, "John", "Doe", "Java", true);
        staff[2] = new DataBase1(3, "John", "Doe", "Java", true);
        staff[3] = new DataBase1(4, "John", "Doe", "Java", true);
        staff[4] = new DataBase1(5, "John", "Doe", "Java", true);
        
        
        List<DataBase1> callDb = new ArrayList<DataBase1>();
        callDb.add(new DataBase1(1, "John", "Doe", "Java", true));
        callDb.add(new DataBase1(2, "Jane", "Dee", "Php", true));
        callDb.add(new DataBase1(3, "Jim", "Downs", "Js", true));
        callDb.add(new DataBase1(4, "Jack", "Jones", "C#", true));
        callDb.add(new DataBase1(5, "Jill", "Doods", "C++", false));
        

        for(int i = 0; i < staff.length; i++){
            System.out.println(staff[i].firstName+" "+staff[i].lastName+" "+staff[i].skill+" "+staff[i].bool);
        }
        
        for(int i = 0; i < callDb.size(); i++){
            System.out.println(callDb.get(i).firstName+" "+callDb.get(i).lastName+" "+callDb.get(i).skill+" "+callDb.get(i).bool);
        }

        System.out.println(Arrays.toString(staff));
}
}

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kevinb4940

ASKER

Thank you very much

krakatoa

Are you sure you needed that? From me I mean.

kevinb4940

ASKER

Yes It was very helpful. It's part of the bigger question. Thanks. I'm doing an intense java course and I'm struggling little but Ill catch up.
Still struggling with the toString ...............getting this output on my following program

Hello , I have attached 3 classes this question, A client class and a server class and a database class. I am trying to print a quote but I keep getting hashcode output instead of the text.

Enter command: 1:get 2:add 3:delete 0:exit
1
Enter quote number to get:
3
QuoteAnswer.DataBase1@548a9f61

--------------------------------------------------------------------------------------------------------------------------------

===========Client Class ============

import java.io.IOException;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.Scanner;

public class QuoteOfTheDayClient_2 {

public static void main(String[] args) throws IOException {

Socket echoSocket = null; // holds the Socket object
Scanner fromServer = null; // input stream from remote host
PrintWriter toServer = null; // output stream to remote host
Scanner stdIn = new Scanner(System.in);
String remoteServer = "localhost"; // are you 'local'?!
//String remoteServer = "193.61.190.96"; // remote host is not 'local'!
int port;

try {
port = 4444; // 17 for localhost
echoSocket = new Socket(remoteServer, port);
fromServer = new Scanner(echoSocket.getInputStream());
toServer = new PrintWriter(echoSocket.getOutputStream(), true);
} catch (Exception e) {
System.err.println("Exception: " + e);
System.exit(1);
} // try-catch

String reply; // holds reply from remote host
int command;

System.out.println("Enter command: 1:get 2:add 3:delete 0:exit");
command = stdIn.nextInt();

while (command > 3 || command < 0) {
System.out.println("Command not recognised");
System.out.println("Please enter one of the following options: 1:get 2:add 3:delete 0:exit");
command = stdIn.nextInt();
}

while (command != 0) {

switch (command) {
case 1: {
// get quote
toServer.println(command);
System.out.println("Enter quote number to get: ");
int quoteNum = stdIn.nextInt();
toServer.println(quoteNum);

while (!(reply = fromServer.nextLine()).isEmpty()) {
System.out.println(reply); // print reply to screen

}
fromServer.nextLine(); // Consume the newline
System.out.println();
break;
}
case 2: {
// add quote

toServer.println(command);
System.out.println("Enter quote:");
stdIn.nextLine(); // flush newline
String quoteString = stdIn.nextLine();
toServer.println(quoteString);
System.out.println("quoteString entered: " + quoteString);

break;
}
case 3: {
// delete quote
toServer.println(command);
System.out.println("Enter quote number to delete: ");
int quoteDel = stdIn.nextInt();
toServer.println(quoteDel);
break;
}
default:
System.out.println("*** Command not recognised ***");
break;
}

System.out.println("Enter command: 1:get 2:add 3:delete 0:exit");
command = stdIn.nextInt();
}
toServer.println(command);
echoSocket.close();
fromServer.close();
toServer.close();
stdIn.close();
} // main
} // EchoClient

===========Server Class ======================================================

import java.io.IOException;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class QuoteOfTheDayServer_2 {

public static void main(String[] args) throws IOException {

ArrayList quotesAL = new ArrayList <>();
quotesAL.add(new DataBase1(1, "Martin L", "King", "Quote 1", true));
quotesAL.add(new DataBase1(2, "Ablert", "Enstein", "Quote 2", true));
quotesAL.add(new DataBase1(3, "William", "Shakespeare", "Quote 3", true));
quotesAL.add(new DataBase1(4, "Mahatma", "Gandi", "Quote 4", true));
quotesAL.add(new DataBase1(5, "Winston", "Churchill", "Quote 5", false));

// Wrap the standard System.in stream with a Scanner so that
Scanner stdIn = new Scanner(System.in);
Scanner fromClient = null;
PrintWriter toClient = null;

int pNum = 4444;
ServerSocket sSocket = null;
Socket cSocket = null;

try {
sSocket = new ServerSocket(pNum);
} catch (IOException e) {
System.out.println("Couldn't listen on port: " + pNum + "; " + e);
System.exit(1);
}

// Continuously wait for client; accept them; and send a quote to them.
while (true) {
try {
System.out.println("Waiting for client ....");
// Blocking 'accept' i.e. wait for a client
cSocket = sSocket.accept();
System.out.println("Client connected from: " + cSocket.getInetAddress());

// Set up the output stream for the server, i.e. a PrintWriter stream
toClient = new PrintWriter(cSocket.getOutputStream(), true);
fromClient = new Scanner(cSocket.getInputStream());

int command = fromClient.nextInt();

System.out.println("Received command: " + command + " from client at " + cSocket.getInetAddress());

while (command != 0) {
switch (command) {
case 1: // get quote
{
System.out.println("GET quote");
int quoteNum = fromClient.nextInt();
toClient.println(quotesAL.get(quoteNum - 1));
System.out.println("Pushed quote number: " + quoteNum + " to client at " + cSocket.getInetAddress());
//toClient.println(quotes[quoteNum]); // return quote
//System.out.println(quoteNum.get(i).firstName+" "+quoteNum.get(i).lastName+" "+quoteNum.get(i).skill
// +" "+quoteNum.get(i).bool);
break;
}
case 2: // add quote
{
System.out.println("ADD quote");
fromClient.nextLine(); // flush newline
String quote = fromClient.nextLine();
System.out.println("Received quote from client:" + quote);
quote = quote + "\n\n";
quotesAL.add(quote);
System.out.println("Added quote" + quote);
break;
}
case 3: // delete quote
{
System.out.println("DEL quote");
int quoteNum = fromClient.nextInt();
System.out.println("DELeting quote number: " + quoteNum);
quotesAL.get(quoteNum - 1);
quotesAL.remove(quoteNum - 1);
break;
}
default:
break;
}
command = fromClient.nextInt();
System.out.println("Received command: " + command + "from client at " + cSocket.getInetAddress());
}
// Close all streams
toClient.close();
cSocket.close();
fromClient.close();
stdIn.close();
} catch (IOException e) {
System.out.println("Accept failed: " + pNum + "; " + e);
System.exit(1);
}
}
} // main
} // QuoteOfTheDayServer_2

===========Database Class ====================================================

import java.util.Arrays;

public class DataBase1 {

int id;
String firstName;
String lastName;
String skill;
Boolean bool;

DataBase1(int id2, String name1, String name2, String skill2, boolean b){ //constructor
int id = id2;
firstName = name1;
lastName = name2;
skill = skill2;
bool = b;
}

public String toString(int id, String firstName, String lastName, String skill, boolean b){
System.out.println(" Id: " + id + "\n Name: " + firstName + " " + lastName + "\n Skill: " + skill + "\n Available: " + b);
return toString();
}

}

krakatoa

Before we go any further, I would strongly recommend you put your code into the code tags. The Big Boys often don't look at code that is just dumped in the body.