Question

我正在尝试使用一些按钮和文本字段的小程序。我能够使用JPanel创建窗口，但不知道如何添加按钮和文本字段

我正在使用的代码是：

public UI() {

    sprites = new HashMap();
   // spriteCache = stage.getSpriteCache();
    JFrame okno = new JFrame ("VoLTE Script");
    setBounds(0,0,SZEROKOSC,WYSOKOSC);
    JPanel panel = (JPanel)okno.getContentPane(); 
    panel.setLayout (null);
    panel.add(this);
    okno.setBounds(0,0,800,600);
    okno.setVisible(true);
    JTextField pole = new JTextField(10);
    JButton przycisk = new JButton("teasda");
    przycisk.setPreferredSize(new Dimension(300, 350));
    przycisk.setLayout(new BorderLayout());
    panel.add(przycisk);
    przycisk.setVisible(true);
    pole.setBounds (300,300,200,200); 
    pole.setLayout(null);
    pole.setVisible(true);
    panel.add(pole);

    okno.addWindowListener(new WindowAdapter(){
            public void windowClosing (WindowEvent e){
                System.exit(0);
            }
    });
    okno.setResizable(false);

    createBufferStrategy(2);
    strategia=getBufferStrategy();
    requestFocus();
   // addKeyListener(this);
   // addMouseListener(this);

    }

Answer 1

你需要正确使用布局，当使用边框布局时，你需要告诉它使用哪个边框（，BorderLayout.NORTH或其他东西），请查看oracles页面上的教程。

P.S。想想你如何命名你的领域等。命名一些东西＆＃34; przycisk＆＃34;只是给了我一个不进一步阅读代码的理由。

Answer 2

此代码来自此网站：Example of Java GUI

//Imports are listed in full to show what's being used
//could just import javax.swing.* and java.awt.* etc..
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JComboBox;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JList;
import java.awt.BorderLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class GuiApp1 {

    //Note: Typically the main method will be in a
    //separate class. As this is a simple one class
    //example it's all in the one class.
    public static void main(String[] args) {

        new GuiApp1();
    }

    public GuiApp1()
    {
        JFrame guiFrame = new JFrame();

        //make sure the program exits when the frame closes
        guiFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        guiFrame.setTitle("Example GUI");
        guiFrame.setSize(300,250);

        //This will center the JFrame in the middle of the screen
        guiFrame.setLocationRelativeTo(null);

        //Options for the JComboBox 
        String[] fruitOptions = {"Apple", "Apricot", "Banana"
                ,"Cherry", "Date", "Kiwi", "Orange", "Pear", "Strawberry"};

        //Options for the JList
        String[] vegOptions = {"Asparagus", "Beans", "Broccoli", "Cabbage"
                , "Carrot", "Celery", "Cucumber", "Leek", "Mushroom"
                , "Pepper", "Radish", "Shallot", "Spinach", "Swede"
                , "Turnip"};

        //The first JPanel contains a JLabel and JCombobox
        final JPanel comboPanel = new JPanel();
        JLabel comboLbl = new JLabel("Fruits:");
        JComboBox fruits = new JComboBox(fruitOptions);

        comboPanel.add(comboLbl);
        comboPanel.add(fruits);

        //Create the second JPanel. Add a JLabel and JList and
        //make use the JPanel is not visible.
        final JPanel listPanel = new JPanel();
        listPanel.setVisible(false);
        JLabel listLbl = new JLabel("Vegetables:");
        JList vegs = new JList(vegOptions);
        vegs.setLayoutOrientation(JList.HORIZONTAL_WRAP);

        listPanel.add(listLbl);
        listPanel.add(vegs);

        JButton vegFruitBut = new JButton( "Fruit or Veg");

        //The ActionListener class is used to handle the
        //event that happens when the user clicks the button.
        //As there is not a lot that needs to happen we can 
        //define an anonymous inner class to make the code simpler.
        vegFruitBut.addActionListener(new ActionListener()
        {
            @Override
            public void actionPerformed(ActionEvent event)
            {
               //When the fruit of veg button is pressed
               //the setVisible value of the listPanel and
               //comboPanel is switched from true to 
               //value or vice versa.
               listPanel.setVisible(!listPanel.isVisible());
               comboPanel.setVisible(!comboPanel.isVisible());

            }
        });

        //The JFrame uses the BorderLayout layout manager.
        //Put the two JPanels and JButton in different areas.
        guiFrame.add(comboPanel, BorderLayout.NORTH);
        guiFrame.add(listPanel, BorderLayout.CENTER);
        guiFrame.add(vegFruitBut,BorderLayout.SOUTH);

        //make sure the JFrame is visible
        guiFrame.setVisible(true);
    }

}

对于未来，我建议您使用 extends JFrame ，这样您只能在不初始化JFrame的情况下编写这样的gui：

public class CalculatorGUI extends JFrame {
    public CalculatorGUI() {
        setTitle("Calculator");
        setBounds(300, 300, 220, 200);
    }}

我建议你查看一些关于如何创建Java Gui或者某些教程的教程。

Answer 3

感谢您的帮助，对不起波兰语名称（已经修复）。我能够用滚动添加文本区域。貌似问题在panel.add（this）;在按钮和文本字段之前推出。根据我的理解，如果在panel.add（极点）之前设置了panel.add（this）;然后将panel.add（this）设置在前面并添加极点但未看到。

低于我的实际工作代码：

... public UI（）{

    sprites = new HashMap();
   // spriteCache = stage.getSpriteCache();
    JFrame okno = new JFrame ("VoLTE Script");
    setBounds(0,0,WIDTH,HEIGHT);
    JPanel panel = (JPanel)okno.getContentPane(); 
    panel.setLayout (null);
    okno.setBounds(0,0,800,600);
    okno.setVisible(true);
    JTextArea pole = new JTextArea();
    pole.setLayout(null);
    pole.setLineWrap(true);
    //pole.setBackground(Color.BLACK);
    pole.setEditable(false);
    JScrollPane scroll = new JScrollPane(pole);
    scroll.setBounds(25,250,500,300);

    scroll.setVerticalScrollBarPolicy(
    JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
    panel.add(scroll);
    panel.add(this);

    okno.addWindowListener(new WindowAdapter(){
            public void windowClosing (WindowEvent e){
                System.exit(0);
            }

}）; okno.setResizable（假）;

    createBufferStrategy(2);
    strategia=getBufferStrategy();
    requestFocus();
   // addKeyListener(this);
    addMouseListener(this);

            }
...

JAVA - 无法将文本字段和按钮添加到容器中

3 个答案: