请指出我正确的方向与这个任务.我不能从主类获取我的JFrame,从另一个类显示JPanel.一切编译没有错误.
JFrameTest.java：
package jframetest;
import java.awt.FlowLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class JFrameTest extends JFrame {
public JFrametest() {
FlowLayout mainLayout = new FlowLayout();
setSize(320,480);
setResizable(false);
setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
setLayout(mainLayout);
JPanel panelMain = new JPanel(mainLayout);
JButton testButton = new JButton("Test12");
panelMain.add(testButton);
JPanelOne panel = new JPanelOne();
panelMain.add(panel);
panel.setVisible(true);
add(panelMain);
}
public static void main(String[] arguments) {
JFrameTest frame = new JFrametest();
frame.setVisible(true);
}
}
JPanelOne.java：
package jframetest;
import java.awt.FlowLayout;
import javax.swing.JButton;
import javax.swing.JPanel;
public class JPanelOne extends JPanel {
public JPanelOne() {
FlowLayout layoutPanel = new FlowLayout();
JPanel panel = new JPanel(layoutPanel);
JButton button = new JButton("test");
panel.add(button);
panel.setVisible(true);
}
}
将不同的JPanels保留在自己的类中是否是一个好习惯？ (例如：想要使JFrame包含几个相同大小的JPanels,这将通过将setVisible()设置为true / false来切换)
编辑
谢谢你的答案.指出.现在回到我的问题：
现在我知道如何添加在其他类中创建的单个GUI元素,我想知道是否可以在其中一个类中组织带有布局管理器的元素(可能在与JPanel相似的其他容器中),因此我可以将它们添加为组织在一个布局(这就是为什么我是要求在其他类中创建整个JPanel).如图：
这个例子的JPanel(第二类)代码将是：
package jframetest;
import java.awt.*;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSeparator;
import net.miginfocom.swing.MigLayout;
public class JPanelOne extends JPanel {
private JPanel panelSettingsMain;
private JLabel labelChooseLanguage,labelWordsCollection;
private JButton buttonSelectLanguage,buttonSelectCollection,buttonStatistics,buttonPrintingOptions,buttonAddNewWordCollection,buttonInterfaceCustomization;
private JSeparator separatorSettingsOne,separatorSettingsTwo,separatorSettingsThree,separatorSettingsFour,separatorSettingsFive;
private Color greenRegular,separatorGreenLight,separatorGreenDark;
public JPanelOne() {
// creating settings main panel
// setting up layout managers
MigLayout layoutSettingsMain = new MigLayout(
"insets 3 0 0 0");
// setting up colors
greenRegular = new Color(30,165,145);
separatorGreenLight = new Color(190,240,220);
separatorGreenDark = new Color(130,205,180);
panelSettingsMain = new JPanel(layoutSettingsMain);
panelSettingsMain.setBackground(Color.WHITE);
// setting up choose language label
labelChooseLanguage = new JLabel("Choose language:");
panelSettingsMain.add(labelChooseLanguage,"gapleft 10,gaptop 15,width 200");
// setting up select language button
buttonSelectLanguage = new JButton("language");
buttonSelectLanguage.setForeground(greenRegular);
buttonSelectLanguage.setFocusPainted(false);
buttonSelectLanguage.setBorder(null);
buttonSelectLanguage.setContentAreaFilled(false);
buttonSelectLanguage.setCursor(new java.awt.Cursor(
java.awt.Cursor.HAND_CURSOR));
panelSettingsMain.add(buttonSelectLanguage,"gapbottom 15px,wrap");
// setting up light separator
separatorSettingsOne = new JSeparator();
separatorSettingsOne.setForeground(separatorGreenLight);
panelSettingsMain.add(separatorSettingsOne,"span 2,width 320,gapbottom 15,wrap");
// setting up words collection label
labelWordsCollection = new JLabel("Words collection:");
panelSettingsMain.add(labelWordsCollection,"gapleft 10");
// setting up selectcollection button
buttonSelectCollection = new JButton("collection");
buttonSelectCollection.setForeground(greenRegular);
buttonSelectCollection.setFocusPainted(false);
buttonSelectCollection.setBorder(null);
buttonSelectCollection.setContentAreaFilled(false);
buttonSelectCollection.setCursor(new java.awt.Cursor(
java.awt.Cursor.HAND_CURSOR));
panelSettingsMain.add(buttonSelectCollection,wrap");
// setting up dark separator
separatorSettingsTwo = new JSeparator();
separatorSettingsTwo.setForeground(separatorGreenDark);
panelSettingsMain.add(separatorSettingsTwo,gapbottom 15px,wrap");
// setting up show statistics button
buttonStatistics = new JButton("Show statistics");
buttonStatistics.setForeground(greenRegular);
buttonStatistics.setFocusPainted(false);
buttonStatistics.setBorder(null);
buttonStatistics.setContentAreaFilled(false);
buttonStatistics.setCursor(new java.awt.Cursor(
java.awt.Cursor.HAND_CURSOR));
panelSettingsMain.add(buttonStatistics,wrap");
// setting up dark separator
separatorSettingsThree = new JSeparator();
separatorSettingsThree.setForeground(separatorGreenDark);
panelSettingsMain.add(separatorSettingsThree,wrap");
// setting up printing options button
buttonPrintingOptions = new JButton("Printing options");
buttonPrintingOptions.setForeground(greenRegular);
buttonPrintingOptions.setFocusPainted(false);
buttonPrintingOptions.setBorder(null);
buttonPrintingOptions.setContentAreaFilled(false);
buttonPrintingOptions.setCursor(new java.awt.Cursor(
java.awt.Cursor.HAND_CURSOR));
panelSettingsMain.add(buttonPrintingOptions,wrap");
// setting up dark separator
separatorSettingsFour = new JSeparator();
separatorSettingsFour.setForeground(separatorGreenDark);
panelSettingsMain.add(separatorSettingsFour,wrap");
// setting up add new word collection button
buttonAddNewWordCollection = new JButton("Add new word collection");
buttonAddNewWordCollection.setForeground(greenRegular);
buttonAddNewWordCollection.setFocusPainted(false);
buttonAddNewWordCollection.setBorder(null);
buttonAddNewWordCollection.setContentAreaFilled(false);
buttonAddNewWordCollection.setCursor(new java.awt.Cursor(
java.awt.Cursor.HAND_CURSOR));
panelSettingsMain.add(buttonAddNewWordCollection,wrap");
// setting up dark separator
separatorSettingsFive = new JSeparator();
separatorSettingsFive.setForeground(separatorGreenDark);
panelSettingsMain.add(separatorSettingsFive,gapbottom 10px,wrap");
// setting up interface customization button
buttonInterfaceCustomization = new JButton(
"Interface customization");
buttonInterfaceCustomization.setForeground(greenRegular);
buttonInterfaceCustomization.setFocusPainted(false);
buttonInterfaceCustomization.setBorder(null);
buttonInterfaceCustomization.setContentAreaFilled(false);
buttonInterfaceCustomization.setCursor(new java.awt.Cursor(
java.awt.Cursor.HAND_CURSOR));
panelSettingsMain.add(buttonInterfaceCustomization,wrap");
}
}
我正在考虑通过将JPanels(例如在示例中)设置为可见或不可见来导航程序GUI.
这是好办法吗？
>我应该将我的GUI分成几个课程,还是把所有内容都放在一起？我在问,因为现在只有一半的代码中的GUI大约有400行长(并且它不能做任何事情,而只是“看”)在这一点上).正如我之前说过的 – 我是初学者,也是我迄今为止写的最长的应用程序之一(我相信这还不是很久)！
编辑
也许我是反思的,所以最终可以有大的GUI类,并通过设置它们是否可见来控制不同的GUI区域的可见性？
编辑
我已经看过Oracle中的cardlayout教程,看起来它对我的任务很有用(不包括从外部类创建JPanels,但是没关系).我首先误解了它,只是在标签窗格(我不想在我的项目中实现)方面考虑cardlayout.
感谢大家的耐心,有用的提示和答案！
解决方法
首先要回答你的问题,你需要在你的JFrameTest构造函数中添加一个这样的框架的框架实例：
add(new JPanelOne());
您还需要将按钮直接添加到JPanelOne本身：
public class JPanelOne extends JPanel {
public JPanelOne() {
JButton button = new JButton("test");
add(button);
}
}
其次,我相信这些代码行有问题：
FlowLayout mainLayout = new FlowLayout();
// snip...
setLayout(mainLayout);
JPanel panelMain = new JPanel(mainLayout);
每个容器应该有自己的布局管理器实例.否则你的GUI会做奇怪的事情：
setLayout(new FlowLayout()); JPanel panelMain = new JPanel(mainLayout);