Question

所以我在Java中制作基于文本的RPG Applet。我正在使用SWING面板，上面有文本字段和按钮。我在Netbeans中编程，我正在使用GUI编辑器。我制作了HTML页面，它在浏览器中打开很好。当我单击按钮切换面板（基本上设置第一个不可见）时，新面板不会加载。我尝试使用repaint（）和validate（），但它只是不起作用.....任何帮助？

package applettest;

import javax.swing.UIManager;

public class NewApplet extends java.applet.Applet {

    startScreen ss;
    registerScreen rs;
    charactercreationScreen ccs;

    @Override
    public void init() {

        try {
            //This sets the look and feel to NIMBUS.
            UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        try {
            java.awt.EventQueue.invokeAndWait(new Runnable() {

                @Override
                public void run() {
                    initComponents();
                    startup();
                }
            });
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 400, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 300, Short.MAX_VALUE)
        );
    }// </editor-fold>                        
    // Variables declaration - do not modify                     
    // End of variables declaration                   

    public void startup() {
        showCharacterCreationScreenSTART();
        showRegisterScreenSTART();
        showStartScreenSTART();
    }

    public void showStartScreen() {
        setSize(410, 350);
        ss = new applettest.startScreen(this);
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).
                addComponent(ss, javax.swing.GroupLayout.PREFERRED_SIZE,
                javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE));
        layout.setVerticalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).
                addComponent(ss, javax.swing.GroupLayout.PREFERRED_SIZE,
                javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE));
    }

    public void showStartScreenSTART() {
        setSize(410, 350);
        rs.setVisible(false);
        ss = new applettest.startScreen(this);
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).
                addComponent(ss, javax.swing.GroupLayout.PREFERRED_SIZE,
                javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE));
        layout.setVerticalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).
                addComponent(ss, javax.swing.GroupLayout.PREFERRED_SIZE,
                javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE));
        repaint();
        validate();
    }

    public void showRegisterScreen() {
        repaint();
        validate();
        ss.setVisible(false);
        setSize(400, 350);
        rs = new applettest.registerScreen(this);
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).
                addComponent(rs, javax.swing.GroupLayout.PREFERRED_SIZE,
                javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE));
        layout.setVerticalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).
                addComponent(rs, javax.swing.GroupLayout.PREFERRED_SIZE,
                javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE));
        repaint();
        validate();
    }

    public void showRegisterScreenSTART() {
        repaint();
        validate();
        ccs.setVisible(false);
        setSize(400, 350);
        rs = new applettest.registerScreen(this);
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).
                addComponent(rs, javax.swing.GroupLayout.PREFERRED_SIZE,
                javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE));
        layout.setVerticalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).
                addComponent(rs, javax.swing.GroupLayout.PREFERRED_SIZE,
                javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE));
        repaint();
        validate();
    }

    public void showCharacterCreationScreen() {
        rs.setVisible(false);
        setSize(400, 350);
        ccs = new applettest.charactercreationScreen(this);
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).
                addComponent(ccs, javax.swing.GroupLayout.PREFERRED_SIZE,
                javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE));
        layout.setVerticalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).
                addComponent(ccs, javax.swing.GroupLayout.PREFERRED_SIZE,
                javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE));
        repaint();
        validate();

    }

    public void showCharacterCreationScreenSTART() {
        setSize(400, 350);
        ccs = new applettest.charactercreationScreen(this);
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).
                addComponent(ccs, javax.swing.GroupLayout.PREFERRED_SIZE,
                javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE));
        layout.setVerticalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).
                addComponent(ccs, javax.swing.GroupLayout.PREFERRED_SIZE,
                javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE));

    }
}

Answer 1

听起来你应该使用CardLayout。

另见：

Answer 2

我尝试使用repaint（）和validate（）但它只是不起作用

仅供参考，使用Swing时应该是：

panel.revalidate();
panel.repaint(); // sometimes needed

虽然通常在从面板添加/删除单个组件时使用该代码。如果你要交换整个面板，那么CardLayout就是你要走的路。

此外，您应该扩展JApplet，而不是Applet。

Java - 重绘不工作

2 个答案: