我的內容窗格只顯示白色，即使它上面有組件
[英]My content pane show only white even if it has components on it
問題描述
我這樣做是對自己的挑戰。 我的問題是，當我單擊按鈕時，即使JPanel中有組件，內容窗格也會顯示為普通。
我嘗試在框架上添加組件，但出現錯誤：>Cannot read field "parent" because "comp" is null.
我在JFrame和JPanel上嘗試了其他布局，但仍然沒有顯示。
這是完整的代碼：
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.DecimalFormat;
public class test implements ActionListener{
public static void main(String [] args) {
new test();
}
static JPanel mainPanel, cubePanel;
static JFrame frame;
static Container container = new Container();
static JLabel calculatorFor;
static JButton sphereButton, rightCylinderButton, rightConeButton, rectangularPrismButton, triangularPrismButton,
cubeButton, squarePyramidButton, rectangularPyramidButton, ellipsoidButton, tetrahedronButton ,backToPreviousFrameButton;
static Font font = new Font(null, Font.PLAIN, 30);
static JLabel enterValueForEdge;
static JTextField edgeTextField;
static JTextArea surfaceAreaTextArea, surfaceAreaFormulaTextArea, surfaceAreaSolutionTextArea;
static JButton calculateButton;
static double edge;
static DecimalFormat surfaceAreaDecimal;
public test(){
frame = new JFrame("Calculating for Surface Area");
calculatorFor = new JLabel("Calculator for the Surface Area of:");
calculatorFor.setSize(600, 40);
calculatorFor.setLocation(100, 50);
calculatorFor.setFont(font);
calculatorFor.setFocusable(false);
sphereButton = new JButton("Sphere ");
sphereButton.setSize(400, 40);
sphereButton.setLocation(100, 100);
sphereButton.setFont(font);
sphereButton.addActionListener(this);
sphereButton.setFocusable(false);
rightCylinderButton = new JButton("Right Cylinder");
rightCylinderButton.setSize(400, 40);
rightCylinderButton.setLocation(100, 150);
rightCylinderButton.setFont(font);
rightCylinderButton.addActionListener(this);
rightCylinderButton.setFocusable(false);
rightConeButton = new JButton("Right Cone");
rightConeButton.setSize(400, 40);
rightConeButton.setLocation(100, 200);
rightConeButton.setFont(font);
rightConeButton.addActionListener(this);
rightConeButton.setFocusable(false);
rectangularPrismButton = new JButton("Rectangular Prism");
rectangularPrismButton.setSize(400, 40);
rectangularPrismButton.setLocation(100, 250);
rectangularPrismButton.setFont(font);
rectangularPrismButton.addActionListener(this);
rectangularPrismButton.setFocusable(false);
triangularPrismButton = new JButton("Triangular Prism");
triangularPrismButton.setSize(400, 40);
triangularPrismButton.setLocation(100, 300);
triangularPrismButton.setFont(font);
triangularPrismButton.addActionListener(this);
triangularPrismButton.setFocusable(false);
cubeButton = new JButton("Cube");
cubeButton.setSize(400, 40);
cubeButton.setLocation(100, 350);
cubeButton.setFont(font);
cubeButton.addActionListener(this);
cubeButton.setFocusable(false);
squarePyramidButton = new JButton("Square Pyramid");
squarePyramidButton.setSize(400, 40);
squarePyramidButton.setLocation(100, 400);
squarePyramidButton.setFont(font);
squarePyramidButton.addActionListener(this);
squarePyramidButton.setFocusable(false);
rectangularPyramidButton = new JButton("Rectangular Pyramid");
rectangularPyramidButton.setSize(400, 40);
rectangularPyramidButton.setLocation(100, 450);
rectangularPyramidButton.setFont(font);
rectangularPyramidButton.addActionListener(this);
rectangularPyramidButton.setFocusable(false);
ellipsoidButton = new JButton("Ellipsoid");
ellipsoidButton.setSize(400, 40);
ellipsoidButton.setLocation(100, 500);
ellipsoidButton.setFont(font);
ellipsoidButton.addActionListener(this);
ellipsoidButton.setFocusable(false);
tetrahedronButton = new JButton("Tetrahedron");
tetrahedronButton.setSize(400, 40);
tetrahedronButton.setLocation(100, 550);
tetrahedronButton.setFont(font);
tetrahedronButton.addActionListener(this);
tetrahedronButton.setFocusable(false);
backToPreviousFrameButton = new JButton("Back");
backToPreviousFrameButton.setSize(100, 40);
backToPreviousFrameButton.setLocation(900, 600);
backToPreviousFrameButton.setFont(font);
backToPreviousFrameButton.addActionListener(this);
backToPreviousFrameButton.setFocusable(false);
mainPanel = new JPanel();
mainPanel.setBounds(0, 0, 1080, 720);
mainPanel.setLayout(null);
mainPanel.setBackground(Color.decode("#FAF7FC"));
mainPanel.add(calculatorFor);
mainPanel.add(sphereButton);
mainPanel.add(rightCylinderButton);
mainPanel.add(rightConeButton);
mainPanel.add(rectangularPrismButton);
mainPanel.add(triangularPrismButton);
mainPanel.add(cubeButton);
mainPanel.add(squarePyramidButton);
mainPanel.add(rectangularPyramidButton);
mainPanel.add(ellipsoidButton);
mainPanel.add(tetrahedronButton);
mainPanel.add(backToPreviousFrameButton);
frame.getContentPane().add(mainPanel);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setBackground(Color.decode("#FAF7FC"));
frame.setLayout(new BorderLayout());
frame.setSize(1080,720);
frame.setResizable(false);
frame.setVisible(true);
frame.setLocationRelativeTo(null);
}
public void cubePanel(){
enterValueForEdge = new JLabel("Enter Edge:");
enterValueForEdge.setSize(200, 40);
enterValueForEdge.setLocation(100, 50);
enterValueForEdge.setFont(font);
enterValueForEdge.setFocusable(false);
edgeTextField = new JTextField();
edgeTextField.setSize(400, 40);
edgeTextField.setLocation(300, 50);
edgeTextField.setFont(font);
calculateButton = new JButton("Calculate");
calculateButton.setSize(200, 40);
calculateButton.setLocation(100, 100);
calculateButton.setFont(font);
calculateButton.addActionListener(this);
calculateButton.setFocusable(false);
surfaceAreaFormulaTextArea = new JTextArea("SA = 6a²");
surfaceAreaFormulaTextArea.setSize(400, 40);
surfaceAreaFormulaTextArea.setLocation(100, 150);
surfaceAreaFormulaTextArea.setFont(font);
surfaceAreaFormulaTextArea.setEditable(false);
surfaceAreaTextArea = new JTextArea("SA: ");
surfaceAreaTextArea.setSize(500, 40);
surfaceAreaTextArea.setLocation(100, 200);
surfaceAreaTextArea.setFont(font);
surfaceAreaTextArea.setEditable(false);
surfaceAreaSolutionTextArea = new JTextArea();
surfaceAreaSolutionTextArea.setSize(900, 80);
surfaceAreaSolutionTextArea.setLocation(100, 250);
surfaceAreaSolutionTextArea.setFont(font);
surfaceAreaSolutionTextArea.setEditable(false);
surfaceAreaSolutionTextArea.setLineWrap(true);
backToPreviousFrameButton = new JButton("Back");
backToPreviousFrameButton.setSize(100, 40);
backToPreviousFrameButton.setLocation(900, 600);
backToPreviousFrameButton.setFont(font);
backToPreviousFrameButton.addActionListener(this);
backToPreviousFrameButton.setFocusable(false);
cubePanel = new JPanel();
cubePanel.setBounds(0, 0, 1080, 720);
cubePanel.setLayout(null);
cubePanel.setBackground(Color.decode("#FAF7FC"));
container = new Container();
cubePanel.add(enterValueForEdge);
cubePanel.add(edgeTextField);
cubePanel.add(calculateButton);
cubePanel.add(surfaceAreaFormulaTextArea);
cubePanel.add(surfaceAreaTextArea);
cubePanel.add(surfaceAreaSolutionTextArea);
cubePanel.add(backToPreviousFrameButton);
container.add(cubePanel);
container.setLayout(null);
container.setBackground(Color.decode("#FAF7FH"));
}
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource() == sphereButton){
new sphereFrame();
frame.dispose();
}
if(e.getSource() == rightCylinderButton){
new rightCylinderFrame();
frame.dispose();
}
if(e.getSource() == rightConeButton){
new rightConeFrame();
frame.dispose();
}
if(e.getSource() == rectangularPrismButton){
new rectangularPrismFrame();
frame.dispose();
}
if(e.getSource() == triangularPrismButton){
new triangularPrismFrame();
frame.dispose();
}
if(e.getSource() == cubeButton){
frame.getContentPane().removeAll();
frame.add(cubePanel);
frame.repaint();
frame.revalidate();
System.out.println("Remove");
frame.getContentPane().add(container);
}
}
2 個解決方案
解決方案1
0 已采納 2022-11-28 16:52:34
Oracle 有一個有用的教程，使用 Swing 創建 GUI 。 跳過學習 Swing 和 NetBeans IDE 部分。 請特別注意在容器內布置組件部分。
這是我創建的 GUI。
按“Cube”按鈕調出立方計算頁面。
所有 Swing 應用程序都必須以調用SwingUtilities invokeLater方法開始。 此方法確保 Swing 組件在Event Dispatch Thread上創建和執行。
JFrame有一個默認的BorderLayout並包含主要的JPanel 。 主JPanel使用CardLayout來顯示各種計算JPanels 。 使用CardLayout比管理多個JFrames更容易，並且提供更好的用戶體驗。
我在各種JPanels上使用 Swing 布局管理器到 position Swing 組件。
起始JPanel由兩個從屬JPanels組成。 標題JPanel使用FlowLayout來顯示標題。 按鈕JPanel使用GridLayout來顯示各種計算JButtons 。 您可以通過嵌套多個簡單的JPanels JPanels
立方體計算JPanel是您的代碼中唯一的一個，因此它也是我創建的唯一一個。 我把它變成了一個方法，但是你可以為每個計算創建一個單獨的 class。 多維數據集計算JPanel使用GridBagLayout創建類似表單的JPanel 。 我使用 lambda 表達式為每個JButtons創建ActionListener ，因為它們非常簡單。
我將啟動JPanel按鈕ActionListener設為單獨的 class 只是為了讓代碼遠離創建JButtons的for循環。
這是完整的可運行代碼。
import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
public class CardLayoutGUI implements Runnable {
public static void main(String[] args) {
SwingUtilities.invokeLater(new CardLayoutGUI());
}
private CardLayout cardLayout;
private JTextField edgeTextField, surfaceAreaSolutionTextField;
private JPanel mainPanel;
@Override
public void run() {
JFrame frame = new JFrame("Calculating for Surface Area");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.mainPanel = createMainPanel();
frame.add(mainPanel, BorderLayout.CENTER);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
private JPanel createMainPanel() {
cardLayout = new CardLayout();
JPanel panel = new JPanel(cardLayout);
panel.setBorder(BorderFactory.createEmptyBorder(0, 5, 5, 5));
panel.add(createStartPanel(), "Start");
panel.add(createCubeCalculationPanel(), "Cube");
return panel;
}
private JPanel createStartPanel() {
JPanel panel = new JPanel(new BorderLayout());
panel.setBorder(BorderFactory.createEmptyBorder(0, 5, 5, 5));
panel.add(createTitlePanel(), BorderLayout.NORTH);
panel.add(createButtonPanel(), BorderLayout.CENTER);
return panel;
}
private JPanel createTitlePanel() {
JPanel panel = new JPanel(new FlowLayout());
panel.setBorder(BorderFactory.createEmptyBorder(0, 5, 5, 5));
Font font = new Font(Font.DIALOG, Font.PLAIN, 36);
JLabel label = new JLabel("Calculator for the Surface Area of:");
label.setFont(font);
panel.add(label);
return panel;
}
private JPanel createButtonPanel() {
String[] text = { "Sphere", "Right Cylinder", "Right Cone",
"Rectangular Prism", "Triangular Prism", "Cube",
"Square Pyramid", "Rectangular Pyramid", "Ellipsoid",
"Tetrahedron" };
JPanel panel = new JPanel(new GridLayout(0, 3, 5, 5));
panel.setBorder(BorderFactory.createEmptyBorder(0, 5, 5, 5));
Font font = new Font(null, Font.PLAIN, 24);
ButtonListener listener = new ButtonListener();
for (String s : text) {
JButton button = new JButton(s);
button.addActionListener(listener);
button.setFont(font);
panel.add(button);
}
return panel;
}
private JPanel createCubeCalculationPanel() {
JPanel panel = new JPanel(new GridBagLayout());
panel.setBorder(BorderFactory.createEmptyBorder(0, 5, 5, 5));
Font titleFont = new Font(null, Font.PLAIN, 32);
Font font = new Font(null, Font.PLAIN, 16);
GridBagConstraints gbc = new GridBagConstraints();
gbc.anchor = GridBagConstraints.LINE_START;
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.insets = new Insets(0, 5, 5, 5);
gbc.weighty = 1.0;
gbc.gridwidth = 2;
gbc.gridx = 0;
gbc.gridy = 0;
JLabel label = new JLabel("SA = 6a²");
label.setFont(titleFont);
panel.add(label, gbc);
gbc.gridwidth = 1;
gbc.gridy++;
label = new JLabel("Edge:");
label.setFont(font);
panel.add(label, gbc);
gbc.gridx++;
edgeTextField = new JTextField(10);
edgeTextField.setFont(font);
panel.add(edgeTextField, gbc);
gbc.gridx = 0;
gbc.gridy++;
label = new JLabel("SA:");
label.setFont(font);
panel.add(label, gbc);
gbc.gridx++;
surfaceAreaSolutionTextField = new JTextField(10);
surfaceAreaSolutionTextField.setFont(font);
surfaceAreaSolutionTextField.setEditable(false);
panel.add(surfaceAreaSolutionTextField, gbc);
gbc.gridwidth = 2;
gbc.gridx = 0;
gbc.gridy++;
JButton calculateButton = new JButton("Calculate");
calculateButton.addActionListener(event -> {
double edge = Double.valueOf(edgeTextField.getText());
double sa = 6.0 * edge * edge;
surfaceAreaSolutionTextField.setText(Double.toString(sa));
});
calculateButton.setFont(font);
panel.add(calculateButton, gbc);
gbc.gridy++;
JButton backButton = new JButton("Back");
backButton.addActionListener(event -> {
cardLayout.show(mainPanel, "Start");
});
backButton.setFont(font);
panel.add(backButton, gbc);
return panel;
}
public class ButtonListener implements ActionListener {
@Override
public void actionPerformed(ActionEvent event) {
JButton button = (JButton) event.getSource();
String text = button.getText();
cardLayout.show(mainPanel, text);
}
}
}
解決方案2
-2 2022-11-28 09:26:54
試試這個：
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.DecimalFormat;
public class Test2 implements ActionListener {
public static void main(String[] args) {
new Test2();
}
static JPanel mainPanel, cubePanel;
static JFrame frame;
static Container container = new Container();
static JLabel calculatorFor;
static JButton sphereButton, rightCylinderButton, rightConeButton, rectangularPrismButton, triangularPrismButton,
cubeButton, squarePyramidButton, rectangularPyramidButton, ellipsoidButton, tetrahedronButton, backToPreviousFrameButton;
static Font font = new Font(null, Font.PLAIN, 30);
static JLabel enterValueForEdge;
static JTextField edgeTextField;
static JTextArea surfaceAreaTextArea, surfaceAreaFormulaTextArea, surfaceAreaSolutionTextArea;
static JButton calculateButton;
static double edge;
static DecimalFormat surfaceAreaDecimal;
public Test2() {
frame = new JFrame("Calculating for Surface Area");
calculatorFor = new JLabel("Calculator for the Surface Area of:");
calculatorFor.setSize(600, 40);
calculatorFor.setLocation(100, 50);
calculatorFor.setFont(font);
calculatorFor.setFocusable(false);
sphereButton = new JButton("Sphere ");
sphereButton.setSize(400, 40);
sphereButton.setLocation(100, 100);
sphereButton.setFont(font);
sphereButton.addActionListener(this);
sphereButton.setFocusable(false);
rightCylinderButton = new JButton("Right Cylinder");
rightCylinderButton.setSize(400, 40);
rightCylinderButton.setLocation(100, 150);
rightCylinderButton.setFont(font);
rightCylinderButton.addActionListener(this);
rightCylinderButton.setFocusable(false);
rightConeButton = new JButton("Right Cone");
rightConeButton.setSize(400, 40);
rightConeButton.setLocation(100, 200);
rightConeButton.setFont(font);
rightConeButton.addActionListener(this);
rightConeButton.setFocusable(false);
rectangularPrismButton = new JButton("Rectangular Prism");
rectangularPrismButton.setSize(400, 40);
rectangularPrismButton.setLocation(100, 250);
rectangularPrismButton.setFont(font);
rectangularPrismButton.addActionListener(this);
rectangularPrismButton.setFocusable(false);
triangularPrismButton = new JButton("Triangular Prism");
triangularPrismButton.setSize(400, 40);
triangularPrismButton.setLocation(100, 300);
triangularPrismButton.setFont(font);
triangularPrismButton.addActionListener(this);
triangularPrismButton.setFocusable(false);
cubeButton = new JButton("Cube");
cubeButton.setSize(400, 40);
cubeButton.setLocation(100, 350);
cubeButton.setFont(font);
cubeButton.addActionListener(this);
cubeButton.setFocusable(false);
squarePyramidButton = new JButton("Square Pyramid");
squarePyramidButton.setSize(400, 40);
squarePyramidButton.setLocation(100, 400);
squarePyramidButton.setFont(font);
squarePyramidButton.addActionListener(this);
squarePyramidButton.setFocusable(false);
rectangularPyramidButton = new JButton("Rectangular Pyramid");
rectangularPyramidButton.setSize(400, 40);
rectangularPyramidButton.setLocation(100, 450);
rectangularPyramidButton.setFont(font);
rectangularPyramidButton.addActionListener(this);
rectangularPyramidButton.setFocusable(false);
ellipsoidButton = new JButton("Ellipsoid");
ellipsoidButton.setSize(400, 40);
ellipsoidButton.setLocation(100, 500);
ellipsoidButton.setFont(font);
ellipsoidButton.addActionListener(this);
ellipsoidButton.setFocusable(false);
tetrahedronButton = new JButton("Tetrahedron");
tetrahedronButton.setSize(400, 40);
tetrahedronButton.setLocation(100, 550);
tetrahedronButton.setFont(font);
tetrahedronButton.addActionListener(this);
tetrahedronButton.setFocusable(false);
backToPreviousFrameButton = new JButton("Back");
backToPreviousFrameButton.setSize(100, 40);
backToPreviousFrameButton.setLocation(900, 600);
backToPreviousFrameButton.setFont(font);
backToPreviousFrameButton.addActionListener(this);
backToPreviousFrameButton.setFocusable(false);
mainPanel = new JPanel();
mainPanel.setBounds(0, 0, 1080, 720);
mainPanel.setLayout(null);
mainPanel.setBackground(Color.decode("#FAF7FC"));
mainPanel.add(calculatorFor);
mainPanel.add(sphereButton);
mainPanel.add(rightCylinderButton);
mainPanel.add(rightConeButton);
mainPanel.add(rectangularPrismButton);
mainPanel.add(triangularPrismButton);
mainPanel.add(cubeButton);
mainPanel.add(squarePyramidButton);
mainPanel.add(rectangularPyramidButton);
mainPanel.add(ellipsoidButton);
mainPanel.add(tetrahedronButton);
mainPanel.add(backToPreviousFrameButton);
frame.getContentPane().add(mainPanel);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setBackground(Color.decode("#FAF7FC"));
frame.setLayout(new BorderLayout());
frame.setSize(1080, 720);
frame.setResizable(false);
frame.setVisible(true);
frame.setLocationRelativeTo(null);
}
public Container cubePanel() {
enterValueForEdge = new JLabel("Enter Edge:");
enterValueForEdge.setSize(200, 40);
enterValueForEdge.setLocation(100, 50);
enterValueForEdge.setFont(font);
enterValueForEdge.setFocusable(false);
edgeTextField = new JTextField();
edgeTextField.setSize(400, 40);
edgeTextField.setLocation(300, 50);
edgeTextField.setFont(font);
calculateButton = new JButton("Calculate");
calculateButton.setSize(200, 40);
calculateButton.setLocation(100, 100);
calculateButton.setFont(font);
calculateButton.addActionListener(this);
calculateButton.setFocusable(false);
surfaceAreaFormulaTextArea = new JTextArea("SA = 6a²");
surfaceAreaFormulaTextArea.setSize(400, 40);
surfaceAreaFormulaTextArea.setLocation(100, 150);
surfaceAreaFormulaTextArea.setFont(font);
surfaceAreaFormulaTextArea.setEditable(false);
surfaceAreaTextArea = new JTextArea("SA: ");
surfaceAreaTextArea.setSize(500, 40);
surfaceAreaTextArea.setLocation(100, 200);
surfaceAreaTextArea.setFont(font);
surfaceAreaTextArea.setEditable(false);
surfaceAreaSolutionTextArea = new JTextArea();
surfaceAreaSolutionTextArea.setSize(900, 80);
surfaceAreaSolutionTextArea.setLocation(100, 250);
surfaceAreaSolutionTextArea.setFont(font);
surfaceAreaSolutionTextArea.setEditable(false);
surfaceAreaSolutionTextArea.setLineWrap(true);
backToPreviousFrameButton = new JButton("Back");
backToPreviousFrameButton.setSize(100, 40);
backToPreviousFrameButton.setLocation(900, 600);
backToPreviousFrameButton.setFont(font);
backToPreviousFrameButton.addActionListener(this);
backToPreviousFrameButton.setFocusable(false);
cubePanel = new JPanel();
cubePanel.setBounds(0, 0, 1080, 720);
cubePanel.setLayout(null);
cubePanel.setBackground(Color.decode("#FAF7FC"));
container = new Container();
cubePanel.add(enterValueForEdge);
cubePanel.add(edgeTextField);
cubePanel.add(calculateButton);
cubePanel.add(surfaceAreaFormulaTextArea);
cubePanel.add(surfaceAreaTextArea);
cubePanel.add(surfaceAreaSolutionTextArea);
cubePanel.add(backToPreviousFrameButton);
container.add(cubePanel);
container.setLayout(null);
container.setBackground(Color.getColor("#FAF7FH"));
return container;
}
@Override
public void actionPerformed(ActionEvent e) {
if (e.getSource() == sphereButton) {
new sphereFrame();
frame.dispose();
}
if (e.getSource() == rightCylinderButton) {
new rightCylinderFrame();
frame.dispose();
}
if (e.getSource() == rightConeButton) {
new rightConeFrame();
frame.dispose();
}
if (e.getSource() == rectangularPrismButton) {
new rectangularPrismFrame();
frame.dispose();
}
if (e.getSource() == triangularPrismButton) {
//new triangularPrismFrame();
frame.dispose();
}
if (e.getSource() == cubeButton) {
frame.getContentPane().removeAll();
frame.add(cubePanel());
frame.repaint();
frame.revalidate();
System.out.println("Remove");
frame.getContentPane().add(container);
}
}
}
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