【发布时间】：2011-08-23 02:20:24
【问题描述】：
所以我正在用 Java 制作一个基于文本的 RPG 小程序。我正在使用 SWING 面板，上面有文本字段和按钮。我在 Netbeans 中对其进行编程，并且正在使用 GUI 编辑器。我已经制作了 HTML 页面，它可以在浏览器中正常打开。当我单击一个按钮来切换面板时（基本上将第一个设置为不可见），新面板不会加载。我尝试使用 repaint() 和 validate() 但它不起作用.....有什么帮助吗？
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));
}
}
【问题讨论】：
-
repaint 可以正常工作，但是您的程序中有一个错误——在哪里？谁知道呢，因为我们没有看到任何代码！
-
显示的代码与您的问题没有太大关系——除了您使用 NetBeans 创建 Swing GUI 代码之外——我建议您不要这样做，因为它可以保护您免受必须学习 Swing，从而干扰您对自己在做什么和不做什么的理解。最好阅读 Swing 教程并正确学习 Swing。
-
在每个方法中你可以看到我使用 repaint() 并验证。让我试着再编辑一些，看看我能不能在几分钟内编辑。
-
我看到大量几乎不可能破译马蒂斯生成的代码。我看到您可能正在向此 GUI 添加组件但似乎并未删除所有组件的方法。但主要是我看到了一个调试噩梦。
-
Netbeans GUI 设计器规则#1：不要使用
GroupLayout。
标签： java swing netbeans applet repaint