This is my code
import javax.swing.*;
import java.awt.*;
import java.awt.Graphics;
public class Test extends JFrame{
private JButton by;
private JButton bn;
JLabel startQuestion;
public Test() {
JPanel p = new JPanel();
by = new JButton("Yes");
bn = new JButton("No");
startQuestion = new JLabel("Would you like to start?");
p.setLayout(null);
by.setBounds(180, 250, 70, 45);
bn.setBounds(250, 250, 70, 45);
startQuestion.setLocation(195, 240);
p.add(by);
p.add(bn);
add(startQuestion);
add(p);
setDefaultCloseOperation(3);
setSize(500, 500);
setVisible(true);
}
public static void main(String...args) {
new Test();
}
}
There are no syntax errors, however my Jlabel is not added (the buttons work fine). I do not want to change the layout from null, as I want to be able to define the positions of the buttons and labels. Does anyone know why this isn't working?
This question is similar to JLabel won't show with JPanel.setLayout(null). Why?
To answer it here, add a line like this:
startQuestion.setBounds(150, 150, 200, 20);
import javax.swing.*;
import java.awt.*;
import java.awt.Graphics;
public class Test extends JFrame{
private JButton by;
private JButton bn;
JLabel startQuestion;
public Test() {
JPanel p = new JPanel();
by = new JButton("Yes");
bn = new JButton("No");
startQuestion = new JLabel("Would you like to start?");
//p.setLayout(null);
by.setBounds(180, 250, 70, 45);
bn.setBounds(250, 250, 70, 45);
startQuestion.setLocation(195, 240);
p.add(by);
p.add(bn);
add(startQuestion);
add(p);
setDefaultCloseOperation(3);
setSize(500, 500);
setVisible(true);
}
public static void main(String...args) {
new Test();
}
}
Note:
you need to comment setlayout(null);
Related
I've been making an app with java swing and JavaFX and didn't run into a problem until now. Whenever I set the guis visibility to true, the GUI becomes very small, when it should be 1150 px wide, 900 px tall. Does anyone get any ideas?
Main Gui code:
import javax.swing.*;
import java.awt.*;
public class mainGui extends JFrame{
public static JFrame mainScreen = new JFrame("Tamo");
public mainGui() {
JPanel topPanel = new JPanel();
mainScreen.setSize(1150, 900);
mainScreen.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mainScreen.setResizable(false);
mainScreen.setLayout(new BorderLayout());
topPanel.setBackground(new Color(226, 230, 204));
topPanel.setPreferredSize(new Dimension(1150, 100));
mainScreen.add(topPanel, BorderLayout.NORTH);
ImageIcon icon = new ImageIcon("C:\\Users\\uname\\Desktop\\TamoDienynas\\pngs\\tamo.png");
mainScreen.setIconImage(icon.getImage());
mainScreen.setVisible(false);
}
public static void main(String[] args) {
new mainGui();
}
}
Class which make's the gui visible:
import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import static me.rockorbonk.tamodienynas.GUI.mainGui.mainScreen;
public class loginGui extends JFrame implements ActionListener {
private static JFrame frame;
private static JLabel userLabel;
private static JLabel passwordLabel;
private static JLabel success;
private static JButton login;
private static JTextField userText;
private static JPasswordField passwordText;
loginGui() {
frame = new JFrame();
JPanel panel = new JPanel();
frame.setSize(350, 200);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setResizable(false);
frame.add(panel);
panel.setLayout(null);
userLabel = new JLabel("User");
userLabel.setBounds(10, 20, 80, 25);
panel.add(userLabel);
userText = new JTextField();
userText.setBounds(100, 20, 165, 25);
panel.add(userText);
passwordLabel = new JLabel("Password");
passwordLabel.setBounds(10, 50, 80, 25);
panel.add(passwordLabel);
passwordText = new JPasswordField();
passwordText.setBounds(100, 50, 165, 25);
panel.add(passwordText);
login = new JButton("Login");
login.setBounds(10, 80, 80, 25);
login.addActionListener(this);
panel.add(login);
success = new JLabel("");
success.setBounds(10, 110, 300, 25);
panel.add(success);
ImageIcon icon = new ImageIcon("C:\\Users\\uname\\Desktop\\TamoDienynas\\pngs\\tamo.png");
frame.setIconImage(icon.getImage());
frame.setVisible(true);
}
#Override
public void actionPerformed(ActionEvent ae) {
String uname = userText.getText();
String pwd = passwordText.getText();
if(uname.equals("rokasbruz") && pwd.equals("Rokas123")) {
success.setText("Sekmingai prisijungėte!");
ActionListener l = evt -> {
userLabel.setVisible(false);
passwordLabel.setVisible(false);
userText.setVisible(false);
passwordText.setVisible(false);
login.setVisible(false);
success.setVisible(false);
frame.setVisible(false);
mainScreen.setVisible(true);
mainScreen.pack();
};
Timer timer = new Timer(2000, l);
timer.setRepeats(false);
timer.start();
}
else{
success.setText("Slapyvardis arba slaptažodis nesutampa!");
}
}
public static void main(String[] args) {
new loginGui();
}
}
Any help would be appreciated!
P.S. I'm using IntelliJ ultimate as the IDE
-Rock
mainScreen is just a JFrame that does not contain anything. Hence when you make it visible, all you see is the title bar. In order to initialize mainScreen you need to call mainGui constructor. Nonetheless, as Andrew Thompson wrote in his comment, your style of coding a Swing application is very unusual. Consider using a dialog as your login window.
Here is your code that displays mainScreen as I believe you intended. I only changed the ActionListener, in class loginGui, that displays mainGui. I added one line which is indicated with the comment ADDED THIS LINE
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.Timer;
import static me.rockorbonk.tamodienynas.GUI.mainGui.mainScreen;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class loginGui extends JFrame implements ActionListener {
private static JFrame frame;
private static JLabel userLabel;
private static JLabel passwordLabel;
private static JLabel success;
private static JButton login;
private static JTextField userText;
private static JPasswordField passwordText;
loginGui() {
frame = new JFrame();
JPanel panel = new JPanel();
frame.setSize(350, 200);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setResizable(false);
frame.add(panel);
panel.setLayout(null);
userLabel = new JLabel("User");
userLabel.setBounds(10, 20, 80, 25);
panel.add(userLabel);
userText = new JTextField();
userText.setBounds(100, 20, 165, 25);
panel.add(userText);
passwordLabel = new JLabel("Password");
passwordLabel.setBounds(10, 50, 80, 25);
panel.add(passwordLabel);
passwordText = new JPasswordField();
passwordText.setBounds(100, 50, 165, 25);
panel.add(passwordText);
login = new JButton("Login");
login.setBounds(10, 80, 80, 25);
login.addActionListener(this);
panel.add(login);
success = new JLabel("");
success.setBounds(10, 110, 300, 25);
panel.add(success);
ImageIcon icon = new ImageIcon("C:\\Users\\uname\\Desktop\\TamoDienynas\\pngs\\tamo.png");
frame.setIconImage(icon.getImage());
frame.setVisible(true);
}
#Override
public void actionPerformed(ActionEvent ae) {
String uname = userText.getText();
String pwd = passwordText.getText();
if (uname.equals("rokasbruz") && pwd.equals("Rokas123")) {
success.setText("Sekmingai prisijungėte!");
ActionListener l = evt -> {
userLabel.setVisible(false);
passwordLabel.setVisible(false);
userText.setVisible(false);
passwordText.setVisible(false);
login.setVisible(false);
success.setVisible(false);
frame.setVisible(false);
new mainGui(); // ADDED THIS LINE
mainScreen.setVisible(true);
mainScreen.pack();
};
Timer timer = new Timer(2000, l);
timer.setRepeats(false);
timer.start();
}
else {
success.setText("Slapyvardis arba slaptažodis nesutampa!");
}
}
public static void main(String[] args) {
new loginGui();
}
}
Here is how it appears (after logging in).
I'm new in Java learning, I was asked to develop a GUI application that simulates four cars racing, You can set the speed for each car. and the following is my code, it can run but can't display the picture. I don't know much about where should I position my picture (In JPanel or JFrame). could someone give me some help to finish the project?
Thanks in advance.
import JavaFX.scene.canvas.GraphicsContext;
import JavaFX.scene.image.ImageView;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.*;
public class Main {
static class program extends JFrame {
//create two JPanel objects.
JPanel topRow = new JPanel();
JPanel lowRow = new JPanel() {
public void paint(Graphics graphics) {
//draw a graph
graphics.drawRect(5, 25, 490, 240);
graphics.drawLine(5, 85, 495, 85);
graphics.drawLine(5, 145, 495, 145);
graphics.drawLine(5, 205, 495, 205);
}
};
private JTextField carped_a = new JTextField();
String s1 = carped_a.getText();//there I want to change this to the //car's speed
private JTextField carped_b = new JTextField();
String s2 = carped_b.getText();
private JTextField carped_c = new JTextField();
String s3 = carped_c.getText();
private JTextField carped_d = new JTextField();
String s4 = carped_d.getText();
program() {
super("program");
setLookAndFeel();
setResizable(false);
setSize(515, 330);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
BorderLayout layout = new BorderLayout();
setLayout(layout);
topRow.setBounds(5, 5, 490, 40);
GridLayout grid = new GridLayout(1, 4, 20, 10);
topRow.setLayout(grid);
JLabel carLabel_a = new JLabel("car 1: ", JLabel.RIGHT);
topRow.add(carLabel_a);
carped_a.setEditable(true);
topRow.add(carped_a);
JLabel carLabel_b = new JLabel("car 2:", JLabel.RIGHT);
topRow.add(carLabel_b);
carped_b.setEditable(true);
topRow.add(carped_b);
JLabel carLabel_c = new JLabel("car 3:", JLabel.RIGHT);
topRow.add(carLabel_c);
carped_c.setEditable(true);
topRow.add(carped_c);
JLabel carLabel_d = new JLabel("car 4:", JLabel.RIGHT);
topRow.add(carLabel_d);
carped_d.setEditable(true);
topRow.add(carped_d);
add(topRow, BorderLayout.NORTH);
add(lowRow, BorderLayout.CENTER);
}
private void setLookAndFeel() {
try {
UIManager.setLookAndFeel(
"com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
} catch (Exception exc) {
// ignore error
}
}
}
static class Car extends JPanel{
JLabel carLabel =new JLabel();
Car(int a, int b) {
carLabel.setBounds(a,b,50,40);
this.add(carLabel);
ImageIcon img=new ImageIcon("car.jpg");
carLabel.setIcon(img);
carLabel.setText(null);
}
}
public static void main(String[] args) {
program program1= new program();
Car car1= new Car(5,45);
}
}
I'm using IntelliJ IDEA.
First of all, you create a Car panel but you never add it to the frame:
public static void main(String[] args) {
program program1 = new program();
Car car1 = new Car(5, 45);
program1.add(car1);
}
Secondly, the image won't shown because it is not in the correct path. When you say new JLabel("myimage.png");, it is expected to have the image into project's main directory. However, this way your application will not be portable (actually it will but you will have to take the whole project with it). In order to make it independent and portable read this question.
I'm trying to create a login form and I have some problems at getting the showPassword checkBox work. When showPassword is selected I want the content of the JPasswordField, passwordField, to be visible and when showPassword is not selected I want it to be "hide". I don't understant why my code doesn't work. I write the code this way because I want to implement it in the future as a Model View Controller. I'd prefer not to change any attribute from private in public if possible. Any ideas why this doesn't work? Thanks!
package project3;
import javax.swing.JFrame;
import java.awt.Container;
import java.awt.Font;
import java.awt.event.ActionListener;
import javax.swing.*;
#SuppressWarnings("serial")
public class LogInWindow extends JFrame {
private Container container = getContentPane();
private JLabel titleLabel = new JLabel("WarehouseApp");
private JLabel userLabel = new JLabel("USERNAME");
private JLabel passwordLabel = new JLabel("PASSWORD");
private JTextField userTextField = new JTextField();
private JPasswordField passwordField = new JPasswordField();
private JButton loginButton = new JButton("LOGIN");
private JCheckBox showPassword = new JCheckBox("Show Password");
private JLabel logInAsLabel = new JLabel("LOGIN AS");
private JComboBox<String> logInAsComboBox = new JComboBox<String>();
public LogInWindow() {
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setBounds(10, 10, 370, 370);
this.setName("Login Form");
this.setResizable(false);
this.setLocationRelativeTo(null);
container.setLayout(null);
titleLabel.setBounds(80, -10, 200, 100);
userLabel.setBounds(50, 80, 100, 30);
userTextField.setBounds(150, 80, 150, 30);
passwordLabel.setBounds(50, 130, 100, 30);
passwordField.setBounds(150, 130, 150, 30);
logInAsLabel.setBounds(50, 180, 100, 30);
logInAsComboBox.setBounds(150, 180, 150, 30);
showPassword.setBounds(150, 220, 150, 30);
loginButton.setBounds(150, 260, 100, 30);
Font font = new Font("Times New Roman", Font.BOLD, 30);
titleLabel.setFont(font);
logInAsComboBox.addItem("ADMIN");
logInAsComboBox.addItem("CLIENT");
logInAsComboBox.setSelectedIndex(-1);
container.add(titleLabel);
container.add(userLabel);
container.add(passwordLabel);
container.add(userTextField);
container.add(passwordField);
container.add(logInAsLabel);
container.add(logInAsComboBox);
container.add(showPassword);
container.add(loginButton);
}
public void showPasswordWhenClicked(ActionListener listenForPassword) {
showPassword.addActionListener(listenForPassword);
}
public boolean getPasswordStatus() {
if (showPassword.isSelected()==true)
return true;
return false;
}
public void setPasswordVisible() {
passwordField.setEchoChar((char) 0);
}
public void setPasswordInvisible() {
passwordField.setEchoChar('*');
}
}
package project3;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class Controller {
private LogInWindow theView;
public Controller(LogInWindow theView) {
this.theView = theView;
this.theView.showPasswordWhenClicked(new showPasswordListener());
}
public class showPasswordListener implements ActionListener {
public void actionPerformed(ActionEvent arg0) {
if (theView.getPasswordStatus()==true) {
theView.setPasswordVisible();
} else {
theView.setPasswordInvisible();
}
}
}
public static void main(String[] args) {
LogInWindow logIn = new LogInWindow();
logIn.setVisible(true);
}
}
Your code does not create an instance of Controller, so that class’s constructor is never called. Therefore, showPasswordWhenClicked is never called.
Try adding this line to your main method:
new Controller(logIn);
I am currently designing a login screen, but I ran into a strange issue. I already designed my GUI with the help of swing, and it was time to make functional buttons. I wanted to test my login button and if it would take me to the frame I want, but it is unable to. I can set a JOptionPane.showMessageDialog for example, which works just fine, but I am unable to open another frame from the button. I tried with New JFrameName().setVisible(true), and also JFrameName test = new JFrameName(); test.setVisible(true);, but the methods show up in red. Here is my code.
package com.edu4java.swing.tutrial3;
import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class LoginView {
public static void main(String[] args) {
JFrame frame = new JFrame("Bus Tour Booking System");
frame.setSize(300, 200);
frame.setResizable(false);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel();
frame.add(panel);
placeComponents(panel);
frame.setVisible(true);
}
private static void placeComponents(JPanel panel) {
panel.setLayout(null);
JLabel titleLabel = new JLabel("Bus Tour Booking System");
titleLabel.setBounds(70,15,150,25);
panel.add(titleLabel);
JLabel userLabel = new JLabel("Username: ");
userLabel.setBounds(30, 50, 80, 25);
panel.add(userLabel);
JTextField userText = new JTextField(20);
userText.setBounds(120, 50, 130, 25);
panel.add(userText);
JLabel passwordLabel = new JLabel("Password: ");
passwordLabel.setBounds(30, 80, 80, 25);
panel.add(passwordLabel);
JPasswordField passwordText = new JPasswordField(20);
passwordText.setBounds(120, 80, 130, 25);
panel.add(passwordText);
JButton loginButton = new JButton("login");
loginButton.setBounds(100, 125, 80, 25);
panel.add(loginButton);
ActionListener myButtonListener = new MyButtonListener();
loginButton.addActionListener(myButtonListener);
}
private static class MyButtonListener implements ActionListener {
#Override
public void actionPerformed(ActionEvent e) {
//can't access a new frame from here :(
}
}
}
I would be very grateful if someone could help me out, I read a lot on Stackoverflow and Reddit, but just can't find the solution. I am also new to Java, so that doesn't help a lot either :D. Thanks in advance!
P.S. As far as the actual functionality for the login screen, I am going to do that in a later stage.
This is your login class. I put the JFrame frame in the global scope, so you can manipulate it from the ButtonListener method. I also created a SomeFrame class, just to demonstrate the new JFrame that would be created when you click the button. When an action is performed(the button is clicked) a new object of SomeFrame is created. Since SomeFrame extends JFrame we can use the method setVisible() to a SomeFrame object. The SomeFrame frame appears and the LoginView is no longer visible.
import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class LoginView {
public static JFrame frame = new JFrame("Bus Tour Booking System");
public static void main(String[] args) {
frame.setSize(300, 200);
frame.setResizable(false);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel();
frame.add(panel);
placeComponents(panel);
frame.setVisible(true);
}
private static void placeComponents(JPanel panel) {
panel.setLayout(null);
JLabel titleLabel = new JLabel("Bus Tour Booking System");
titleLabel.setBounds(70,15,150,25);
panel.add(titleLabel);
JLabel userLabel = new JLabel("Username: ");
userLabel.setBounds(30, 50, 80, 25);
panel.add(userLabel);
JTextField userText = new JTextField(20);
userText.setBounds(120, 50, 130, 25);
panel.add(userText);
JLabel passwordLabel = new JLabel("Password: ");
passwordLabel.setBounds(30, 80, 80, 25);
panel.add(passwordLabel);
JPasswordField passwordText = new JPasswordField(20);
passwordText.setBounds(120, 80, 130, 25);
panel.add(passwordText);
JButton loginButton = new JButton("login");
loginButton.setBounds(100, 125, 80, 25);
panel.add(loginButton);
ActionListener myButtonListener = new MyButtonListener();
loginButton.addActionListener(myButtonListener);
}
private static class MyButtonListener implements ActionListener {
#Override
public void actionPerformed(ActionEvent e) {
SomeFrame newFrame = new SomeFrame();
newFrame.setVisible(true);
frame.setVisible(false);
}
}
}
This is the SomeFrame class.
import javax.swing.JFrame;
import javax.swing.JPanel;
public class SomeFrame extends JFrame {
public SomeFrame(){
super("something");
this.setSize(300, 200);
this.setResizable(false);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel();
this.add(panel);
this.setVisible(true);
}
}
I've got 2 errors:
C:\Users\anderson\Documents\FlopstoGFlopsConverter1.java:80: error: cannot find symbol
long flops = Long.parseLong(this.textField1.getText());
^
symbol: variable textField1
C:\Users\anderson\Documents\FlopstoGFlopsConverter1.java:85: error: cannot find symbol
this.textField2.setText(String.valueOf(gFlops));
^
symbol: variable textField2
2 errors
it's just so difficult to learn.
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.JTextField;
public class FlopstoGFlopsConverter1 extends JFrame implements ActionListener {
private static final long serialVersionUID = 1L;
FlopstoGFlopsConverter1() {
setSize(500, 350);
setVisible(true);
JButton button1 = new JButton("Convert!");
button1.addActionListener(this);
JPanel panel = new JPanel();
panel.add(button1);
panel.setLayout(null);
this.add(panel);
button1.setBounds(190, 230, 100, 30);
JLabel label1 = new JLabel("Enter Flops");
panel.add(label1);
this.add(panel);
label1.setBounds(89, 52, 150, 50);
JTextField textArea1 = new JTextField(20);
JPanel p = new JPanel();
panel.add(textArea1);
this.add(panel);
textArea1.setBounds(160, 69, 160, 20);
JTextField textArea2 = new JTextField(20);
panel.add(textArea2);
this.add(panel);
textArea2.setBounds(159, 155, 160, 20);
JLabel label2 = new JLabel("Gigaflops ");
panel.add(label2);
this.add(panel);
label2.setBounds(91, 150, 200, 30);
}
public static void main(String[]args) {
new FlopstoGFlopsConverter1();
}
public void actionPerformed(ActionEvent e) {
System.out.println("");
try {
long flops = Long.parseLong(this.textField1.getText());
double gFlops = flops/1000000000;
this.textField2.setText(String.valueOf(gFlops));
} catch(Exception exception) {
}
}
}
You need to declare textArea1 and textArea2 as instance variables and use those in actionPerformed() method.
Currently, there are no textField1 and textField2 declared, instead textArea1 and textArea2, but even these are in the local scope of the constructor.
JTextField textArea1 = null; // Outside the constructor, inside the class
JTextField textArea2 = null; // Outside the constructor, inside the class
...
...
// Inside actionPerformed method
long flops = Long.parseLong(this.textArea1.getText()); // use textArea1
...
this.textArea2.setText(String.valueOf(gFlops));
As it says you do not have any declaration of textField1 and textField2. Declare them first. If you meant to use textArea1 and textArea2, declare them as instance variables after the class declaration so you can use them. Your class would look like this:
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.JTextField;
public class FlopstoGFlopsConverter1 extends JFrame implements ActionListener {
private static final long serialVersionUID = 1L;
private JTextField textArea1;
private JTextField textArea2;
FlopstoGFlopsConverter1() {
setSize(500, 350);
setVisible(true);
JButton button1 = new JButton("Convert!");
button1.addActionListener(this);
JPanel panel = new JPanel();
panel.add(button1);
panel.setLayout(null);
this.add(panel);
button1.setBounds(190, 230, 100, 30);
JLabel label1 = new JLabel("Enter Flops");
panel.add(label1);
this.add(panel);
label1.setBounds(89, 52, 150, 50);
textArea1 = new JTextField(20);
JPanel p = new JPanel();
panel.add(textArea1);
this.add(panel);
textArea1.setBounds(160, 69, 160, 20);
textArea2 = new JTextField(20);
panel.add(textArea2);
this.add(panel);
textArea2.setBounds(159, 155, 160, 20);
JLabel label2 = new JLabel("Gigaflops ");
panel.add(label2);
this.add(panel);
label2.setBounds(91, 150, 200, 30);
}
public static void main(String[]args) {
new FlopstoGFlopsConverter1();
}
public void actionPerformed(ActionEvent e) {
System.out.println("");
try {
long flops = Long.parseLong(this.textArea1.getText());
double gFlops = flops/1000000000;
this.textArea2.setText(String.valueOf(gFlops));
} catch(Exception exception) {
}
}
}