I cant figure out how to save my guis input so when I close it and reopen it the

Question

I cant figure out how to save my guis input so when I close it and reopen it the information I changed or added is in the gui thanks for the help.

  import javax.swing.*;

import java.awt.event.ActionListener;

import java.awt.event.ActionEvent;

import java.util.ArrayList;

public class PartManager implements ActionListener{

JFrame window = new JFrame();

Inventory partsList;

JButton delete = new JButton("Delete");

JButton add = new JButton("Add");

JList displaybox;

DefaultListModel listnum;

String[] list;

JButton edit = new JButton("Edit");

public PartManager(){

partsList = new Inventory();

Parts t1 = new Parts("POS");

Parts t2 = new Parts("POS 2");

Parts t3 = new Parts("POS 3");

partsList.add(t1);

partsList.add(t2);

partsList.add(t3);

window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

window.setSize(500,400);

window.setTitle("Parts");

window.setLayout(null);

listnum = new DefaultListModel();

list = new String[partsList.getSize()];

for (int n = 0; n < partsList.getSize() ; n++){

Parts c = partsList.getPart(n);

list[n] = c.getName();

listnum.addElement(list[n]);

}

displaybox = new JList(listnum);

JScrollPane displayscroll = new JScrollPane(displaybox);

displayscroll.setLocation(10,50);

displayscroll.setSize(200, 100);

window.add(displayscroll);

delete.setSize(100,25);

delete.setLocation(225,80);

delete.addActionListener(this);

window.add(delete);

add.setSize(100,25);

add.setLocation(225,110);

add.addActionListener(this);

window.add(add);

edit.setSize(100,25);

edit.setLocation(225,50);

edit.addActionListener(this);

window.add(edit);

window.setVisible(true);

}

public static void main(String[] args){

PartManager temp = new PartManager();

}

public void addToList(Parts tempPart){

partsList.add(tempPart);

listnum.addElement(tempPart.getName());

}

public void removeFromList(Parts p, int n){

partsList.remove(p);

listnum.remove(n);

displaybox.setSelectedIndex(n);

displaybox.ensureIndexIsVisible(n);

}

public void resetDisplayBox(Parts tempPart, int index){

listnum.setElementAt(tempPart.getName(), index);

displaybox.setSelectedIndex(index);

displaybox.ensureIndexIsVisible(index);

}

public void actionPerformed(ActionEvent e) {

int index = displaybox.getSelectedIndex();

if(e.getSource() == add){

Parts newPart = new Parts("");

index = listnum.getSize();

PartEditor tempWindow = new PartEditor(true, newPart, this, index);

}

else if (e.getSource() == edit){

if(index>=0){

Parts f = partsList.getPart(index);

PartEditor editwindow = new PartEditor(false,f, this, index);

}

}else if(e.getSource()==delete){

if(index>=0){

Parts f = partsList.getPart(index);

this.removeFromList(f, index);

}

}

}

}

import java.util.ArrayList;

public class Inventory {

ArrayList<Parts> partList = new ArrayList<Parts>();

public void add(Parts p){

partList.add(p);

}

public void remove(Parts p){

partList.remove(p);

}

public int getSize(){

return partList.size();

}

public Parts getPart(int i){

return partList.get(i);

}

public boolean doesContain(Parts p){

boolean temp = partList.contains(p);

return temp;

}

}

public class Parts {

public String name;

public Parts(String temp){

name=temp;

}

public String getName(){

return name;

}

public void setName(String newName){

name=newName;

}

}

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JDialog;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JTextField;

public class PartEditor implements ActionListener {

private JTextField name;

private Parts part;

private boolean isNew;

JFrame editorWindow;

private int index;

PartManager mainWindow;

public PartEditor(boolean isNewTemp, Parts part, PartManager temp, int tempIndex){

this.part = part;

this.mainWindow = temp;

isNew=isNewTemp;

index=tempIndex;

JDialog hi = new JDialog(editorWindow, "Hi", true);

editorWindow = new JFrame();

editorWindow.setSize(300,500);

editorWindow.setTitle("Contact Editor");

editorWindow.setLayout(null);

JLabel fnlabel = new JLabel("First Name");

fnlabel.setSize(150, 10);

fnlabel.setLocation(10,15);

editorWindow.add(fnlabel);

name = new JTextField();

name.setText(part.getName());

name.setSize(150, 25);

name.setLocation(100, 295);

editorWindow.add(name);

JButton apply = new JButton("Apply!");

apply.setSize(150, 25);

apply.setLocation(50,425);

apply.addActionListener(this);

editorWindow.add(apply);

editorWindow.setVisible(true);

}

@Override

public void actionPerformed(ActionEvent e) {

part.setName(name.getText());

if(isNew==true){

mainWindow.addToList(part);

}else {

mainWindow.resetDisplayBox(part, index);

}

editorWindow.dispose();

}

}

Explanation / Answer

Have made necessary changes to PartManager.java, please rate :) :

import javax.swing.*;

import java.awt.event.ActionListener;

import java.awt.event.ActionEvent;

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.File;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

import java.util.ArrayList;

import java.util.HashMap;

public class PartManager implements ActionListener{

JFrame window = new JFrame();

Inventory partsList;

JButton delete = new JButton("Delete");

JButton add = new JButton("Add");

JButton save= new JButton("Save");

JList displaybox;

DefaultListModel listnum;

String[] list;

JButton edit = new JButton("Edit");

String path="e:/list.txt";

public PartManager(){

partsList = new Inventory();

try {

ArrayList<String> ar=readFile(path);

for(String e:ar)

{

Parts t = new Parts(e);

partsList.add(t);

}

} catch (IOException e)

{

System.out.println("File not found, creating one.....");

}

window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

window.setSize(500,400);

window.setTitle("Parts");

window.setLayout(null);

listnum = new DefaultListModel();

list = new String[partsList.getSize()];

for (int n = 0; n < partsList.getSize() ; n++){

Parts c = partsList.getPart(n);

list[n] = c.getName();

listnum.addElement(list[n]);

}

displaybox = new JList(listnum);

JScrollPane displayscroll = new JScrollPane(displaybox);

displayscroll.setLocation(10,50);

displayscroll.setSize(200, 100);

window.add(displayscroll);

delete.setSize(100,25);

delete.setLocation(225,80);

delete.addActionListener(this);

window.add(delete);

add.setSize(100,25);

add.setLocation(225,110);

add.addActionListener(this);

window.add(add);

edit.setSize(100,25);

edit.setLocation(225,50);

edit.addActionListener(this);

window.add(edit);

save.setSize(100,25);

save.setLocation(225,150);

save.addActionListener(this);

window.add(save);

window.setVisible(true);

}

public ArrayList<String> readFile(String path) throws IOException

{

BufferedReader br=new BufferedReader(new FileReader(new File(path)));

String line="";

ArrayList<String> ar=new ArrayList<String>();

while((line=br.readLine())!=null)

{

ar.add(line);

}

return ar;

}

public void writeToFile(ArrayList<Parts> partList, String path) throws IOException

{

File file = new File(path);

if (file.exists())

{

file.delete();

file.createNewFile();

}

FileWriter fw = new FileWriter(file.getAbsoluteFile());

BufferedWriter bw = new BufferedWriter(fw);

for(Parts e:partList)

{

bw.write(e.getName());

bw.newLine();

}

bw.close();

}

public static void main(String[] args){

PartManager temp = new PartManager();

}

public void addToList(Parts tempPart){

partsList.add(tempPart);

listnum.addElement(tempPart.getName());

}

public void removeFromList(Parts p, int n){

partsList.remove(p);

listnum.remove(n);

displaybox.setSelectedIndex(n);

displaybox.ensureIndexIsVisible(n);

}

public void resetDisplayBox(Parts tempPart, int index){

listnum.setElementAt(tempPart.getName(), index);

displaybox.setSelectedIndex(index);

displaybox.ensureIndexIsVisible(index);

}

public void actionPerformed(ActionEvent e) {

int index = displaybox.getSelectedIndex();

if(e.getSource() == add){

Parts newPart = new Parts("");

index = listnum.getSize();

PartEditor tempWindow = new PartEditor(true, newPart, this, index);

}

else if (e.getSource() == edit){

if(index>=0){

Parts f = partsList.getPart(index);

PartEditor editwindow = new PartEditor(false,f, this, index);

}

}else if(e.getSource()==delete){

if(index>=0){

Parts f = partsList.getPart(index);

this.removeFromList(f, index);

}

}

else if(e.getSource()==save)

{

try {

writeToFile(partsList.partList, path);

} catch (IOException e1) {

// TODO Auto-generated catch block

e1.printStackTrace();

}

}

}

}

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