英文:
Converting a console interface to GUI in java
问题
Here's the translation of the code you provided:
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
public class G extends javax.swing.JFrame {
G() {
JFrame f = new JFrame("Parking System");
// ... (Other GUI components)
JButton b = new JButton("Confirm");
// ... (Other GUI components)
JButton b1 = new JButton("Back");
// ... (Other GUI components)
b.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
int selectedOption = Integer.parseInt(textfield3.getText());
if (selectedOption == 1) {
// Call the getSlots method of the CarPark class
// Display the output in the GUI window
} else if (selectedOption == 2) {
// Call the parking method of the CarPark class
// Execute the code inside the method and display output
}
// ... (Other cases for different options)
}
});
// ... (Other GUI components)
}
public static void main(String[] args) {
new G();
}
}
Please note that you'll need to complete the code in the ActionListener to call the appropriate methods from the CarPark class and display the output in the GUI window. Additionally, you'll need to establish a connection between the G class and the CarPark class so that they can communicate and interact. This could be done through composition or other design patterns depending on the complexity of your application.
英文:
I am trying to change a console-based interface for a parking system to a GUI based one. I am using Swing and I have created a GUI class G that will act as the main menu of the new system. This is what I have so far:
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import java.awt.GraphicsConfiguration;
public class G extends javax.swing.JFrame {
G(){
JFrame f=new JFrame("Parking System");
//submit button
JButton b=new JButton("Confirm");
b.setBounds(600,500,100, 40);
JButton b1 = new JButton("Back");
//enter name label
JLabel label = new JLabel();
label.setText("Please enter number of slots for staff:");
label.setBounds(10, 10, 400, 100);
JTextField textfield1= new JTextField();
textfield1.setBounds(280, 50, 50, 20);
textfield1.setHorizontalAlignment(JTextField.CENTER);
//empty label which will show event after button clicked
JLabel label1 = new JLabel();
label1.setText("Please enter number of slots for visitor:");
label1.setBounds(10, 210, 400, 100);
JTextField textfield2 = new JTextField();
textfield2.setBounds(280, 250, 50, 20);
textfield2.setHorizontalAlignment(JTextField.CENTER);
JLabel label3 = new JLabel();
JLabel label2 = new JLabel();
JLabel label4= new JLabel();
label4.setText("The slots for visitor have been created");
JLabel menu = new JLabel();
JLabel lab1= new JLabel();
JLabel lab2 = new JLabel();
JLabel lab3 = new JLabel();
JLabel lab4 = new JLabel();
JLabel lab5 = new JLabel();
JLabel lab6 = new JLabel();
JLabel lab7 = new JLabel();
JLabel lab8 = new JLabel();
JButton in = new JButton();
JTextField textfield3 = new JTextField();
textfield3.setHorizontalAlignment(JTextField.CENTER);
//textfield to enter name
//add to frame
f.add(label);
f.add(textfield1);
f.add(label1);
f.add(label2);
f.add(label3);
f.add(textfield2);
f.add(label2);
f.add(menu);
f.add(lab1);
f.add(lab2);
f.add(lab3);
f.add(lab4);
f.add(lab5);
f.add(lab6);
f.add(lab7);
f.add(lab8);
f.add(in);
f.add(textfield3);
f.add(b);
f.add(b1);
f.setSize(800,600);
f.setLayout(null);
f.setVisible(true);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//action listener
b.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
label.setText(textfield1.getText());
textfield1.setBounds(280, 50, 0, 0);
label1.setText("slots for staff are created successfully");
label1.setBounds(30, 10, 400, 100);
label3.setText(textfield2.getText());
label3.setBounds(10, 30,50,100);
textfield2.setBounds(280,50,0,0);
label2.setText("slots for visitors are created successfully");
label2.setBounds(30, 30, 400,100);
menu.setBounds(10, 60, 400,100);
menu.setText("Main Menu");
lab1.setText("1: List all car slots");
lab1.setBounds(10, 80, 400, 100);
lab2.setText("2: Park a car");
lab2.setBounds(10, 120, 400, 100);
lab3.setText("3: Find a car");
lab3.setBounds(10, 160, 400, 100);
lab4.setText("4: Remove a car");
lab4.setBounds(10, 200, 400, 100);
lab5.setText("5: Add a car");
lab5.setBounds(10, 240, 400, 100);
lab6.setText("6: Delete a car slot");
lab6.setBounds(10, 280, 400, 100);
lab7.setText("7: Exit");
lab7.setBounds(10, 320, 400, 100);
lab8.setText("Please select an option from (1-7)");
lab8.setBounds(10, 360,400,100);
textfield3.setBounds(240, 402, 30, 20);
b1.setBounds(100,500,100,40);
}
});
}
public static void main(String[] args) {
new G();
}
}
From the initial console-based interface, I have the CarPark class which is responsible for maintaining a list of available parking slots. This is a part of the CarPark class
import java.util.*;
public class CarPark {
private Map<String, String> staffParking = new HashMap<String, String>();
private Map<String, String> visitorParking = new HashMap<String, String>();
private static int s_slots;
private static int v_slots;
private static int nextStaffSlot = 1;
private static int nextVisitorSlot = 1;
private List<ParkingSlot> slotInfos = new ArrayList<ParkingSlot>();
CarPark( int v_slot, int s_slot) {
v_slots = v_slot;
s_slots = s_slot;
int number = 1;
for (int i=0; i<v_slots; i++) {
String slot = "V" + String.format("%03d", number++);
visitorParking.put(slot, "not occupied");
}
number = 1;
for (int j = 0; j<s_slots; j++) {
String slot = "S" + String.format("%03d", number++);
staffParking.put(slot, "not occupied");
}
}
public void getSlots() {
for (Map.Entry<String, String> id : staffParking.entrySet()) {
System.out.print("SlotID is: "+id.getKey() + ", is for staff, ");
System.out.println("and is "+id.getValue());
}
for (Map.Entry<String, String> id : visitorParking.entrySet()) {
System.out.print("SlotID is: "+id.getKey() + ", is for visitor, ");
System.out.println("and is "+id.getValue());
}
}
private boolean validRego(String carNum) { //validate car registration
if (!Character.isUpperCase(carNum.charAt(0))) {
return false;
}
for(int i=1;i<carNum.length();i++) { //use ascii values to check if valid
if(!(carNum.charAt(i)>47 && carNum.charAt(i)<58)) {
return false;
}
else if ((carNum.length()>6) || (carNum.length()<6) ){
return false;}
}
return true;
}
public void parking() { //enter parking info
System.out.println("Enter S for staff parking or V for visitor parking ");
Scanner in = new Scanner(System.in);
char slotType = in.next().charAt(0);
ParkingSlot slotInfo;
if(slotType == 'V') { //for visitor
if(nextVisitorSlot<=v_slots) {
System.out.println("Please enter slot number:");
String slot_num = in.next();
if(!(visitorParking.containsKey(slot_num))) {
System.out.println("Enter valid slot number!");
}
else {
System.out.println("Please enter car registration number:");
String c_number = in.next();
if(validRego(c_number)) {
System.out.println("Enter owner's name: ");
String owner = in.next();
if(visitorParking.containsKey(slot_num)) {
if(visitorParking.get(slot_num) != "occupied") {
nextVisitorSlot++;
visitorParking.put(slot_num,"occupied");
slotInfo = new VisitorParkingSlot(c_number,owner,slot_num);
slotInfos.add(slotInfo);
System.out.println("Car successfully added!");
}
else {
System.out.println("The slot is already occupied");
}
}
}else {
System.out.println("Enter valid car registration number.");
}
}
}
else {
System.out.println("All Visitor parking slots are occupied.");
}
}
else if(slotType == 'S') { //for staff
if(nextStaffSlot<=s_slots) {
System.out.println("Enter the slot number:");
String slot_num = in.next();
if(!(staffParking.containsKey(slot_num))) {
System.out.println("Enter valid slot number!");
}
else {
System.out.println("Enter the car number:");
String c_number = in.next();
if(validRego(c_number)) {
System.out.println("Enter owner's name");
String owner = in.next();
if(staffParking.containsKey(slot_num)) {
if(staffParking.get(slot_num)!="occupied") {
nextStaffSlot++;
staffParking.put(slot_num,"occupied");
slotInfo = new StaffParkingSlot(c_number,owner,slot_num);
slotInfos.add(slotInfo);
System.out.println("Car successfully added!");
}else {
System.out.println("The slot is already occupied");
}
}
}else {
System.out.println("Enter valid car registration number.");
}
}
}
else {
System.out.println("All Staff parking slots are occupied.");
}
}
else {
System.out.println("Parking slots must start with S or V!");
}
}
}
My question is how can I link the GUI class G with the CarPark class so that if the user for example enters 1 into textfield3, the method getSlots is called or if the user enters 2, the method parking is called and the code inside the methods is executed and the output inside the methods is displayed in the GUI window when the confirm button is clicked. I am new to GUI so I have been looking up tutorials so far but I haven't found anything to help me with this issue. Any help would be appreciated!
答案1
得分: 1
问题非常广泛。我会尝试概述一个大致的路线图。
首先要做的是将UI与数据分离。为此，添加一个类，其唯一目的是保存UI所需的所有数据（和一些逻辑）。
这种类通常被称为模型类。我们称其为 CarParkModel。
为了演示这个想法，考虑一个非常基本的 CarPark，它只创建一些停车位并显示空闲车位的数量：
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
public class CarPark {
private final CarParkModel model;
CarPark() {
model = new CarParkModel();
Scanner in = new Scanner(System.in);
int parkingSlot = 0;
while(true){
System.out.println("Please enter valid number of parking slots <1-5>: ");
parkingSlot = in.nextInt();
if(parkingSlot>0 && parkingSlot<6) {
break;
}
}
for (int i=0; i<parkingSlot; i++) {
model.addStaffParking(true);
}
}
public int freeParkings() {
return model.freeParkings();
}
public static void main(String[] args) {
CarPark cp = new CarPark();
System.out.println("number of free slots is " + cp.freeParkings());
}
}
class CarParkModel{
private final List<String> parking = new ArrayList<>();
private final static String OCCUPIED = "occupied", FREE = "free";
void addStaffParking(boolean isFree){
if(isFree){
parking.add(FREE);
}else{
parking.add(OCCUPIED);
}
}
int freeParkings(){
int numberOfFreeParkings = 0;
for(String s : parking){
if(s.equals(FREE)) {
numberOfFreeParkings++;
}
}
return numberOfFreeParkings;
}
}
下一步是创建GUI，使用完全相同的模型。这就是为什么我们将数据（模型）与视图（UI）分开的原因。
在构建 swing GUI 时，不要设置边界。使用布局管理器。
英文:
The question is quiet broad. I'll try to outline a rough roadmap.<br/>
The first thing to do is to sperate UI from data. To do that add a class that its sole purpose it to hold all the data (and some logic) that is required by the UI. <br/>
Such class is typically referred to as model class. Let's call it CarParkModel.<br/>
To demonstrate the idea consider a very basic CarPark that only creates a number of parking slots and shows the number of free slots:
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
public class CarPark {
private final CarParkModel model;
CarPark() {
model = new CarParkModel();
Scanner in = new Scanner(System.in);
int parkingSlot = 0;
while(true){
System.out.println("Please enter valid number of parking slots <1-5>: ");
parkingSlot = in.nextInt();
if(parkingSlot>0 && parkingSlot<6) {
break;
}
}
for (int i=0; i<parkingSlot; i++) {
model.addStaffParking(true);
}
}
public int freeParkings() {
return model.freeParkings();
}
public static void main(String[] args) {
CarPark cp = new CarPark();
System.out.println("number of free slots is " + cp.freeParkings());
}
}
class CarParkModel{
private final List<String> parking = new ArrayList<>();
private final static String OCCUPIED = "occupied", FREE = "free";
void addStaffParking(boolean isFree){
if(isFree){
parking.add(FREE);
}else{
parking.add(OCCUPIED);
}
}
int freeParkings(){
int numberOfFreeParkings = 0;
for(String s : parking){
if(s.equals(FREE)) {
numberOfFreeParkings++;
}
}
return numberOfFreeParkings;
}
}
Next step would be creating a GUI, using the very same model. This is why we separate the data (model) from the view (UI).
<br/>When you build swing gui, do not set bounds. Use layout managers .
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