我正在做我的家庭作业。我有一个主类，它使用以下调用来访问以下 JSplash 类。
JSplash splash = new JSplash();
但是，当我在我的主要方法中使用它来创建一个带有 JSplash 类的框架时，它会编译......但没有出现任何窗口。我无法理解我做错了什么。
它实现的 DFrame 类是我创建的作为 JFrame 扩展的类，我也会将它发布在这段代码的底部
package InventoryApp;
//Import
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
/**
*
* @author Curtis
*/
public class JSplash extends DFrame implements ActionListener
{
//declaration of variable objects
Font myFont = new Font("Arial", Font.BOLD, 20);
JButton myButton = new JButton("Click Me!");
Color bgColor = new Color(0,0,255);
Color firstColor = new Color(255,255,255);
String first = "Welcome to DaemoDynamics!";
String last = "Click the Button";
String middle = "";
String middle2 = "";
private static int count = 1;
JSplash frame = new JSplash();
//Constructor
public JSplash()
{
setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
setLayout (new BorderLayout());
add(myButton, BorderLayout.SOUTH);
setDefaultLookAndFeelDecorated(true);
getContentPane().setBackground(bgColor);
//adds action listener
myButton.addActionListener(this);
final int TALL = 316;
final int WIDE = 304;
frame.setSize(WIDE, TALL);
frame.setVisible(true);
}
//Paint method
@Override
public void paint(Graphics e)
{
super.paint(e);
e.setFont(myFont);
e.setColor(firstColor);
e.drawString(first, 14, 80);
e.drawString(last, 70, 240);
e.drawString(middle, 75, 150);
e.drawString(middle2, 60, 175);
}
//Listener Method
@Override
public void actionPerformed(ActionEvent e)
{
//First Time button hit
if(count == 1)
{
middle = "Brighter Business";
middle2 = "for A Brighter Future";
last = "Click Again to Begin";
repaint();
//increases button count
count ++;
}
else//if button count is not 1
{
frame.setVisible(false);
FinalProject app = new FinalProject();
}
}
}
现在，以下代码是我的 DFrame 类。当我将它与其他类一起使用时，它可以正常工作。
package InventoryApp;
import java.awt.Color;
import java.awt.Container;
import java.awt.FlowLayout;
import javax.swing.JFrame;
/**
*
* @author Curtis
*/
public class DFrame extends JFrame
{
//variables
final int WIDE = 304;
final int HIGH = 316;
String x = "";
Container con = getContentPane();
//frame constructor
public DFrame()
{
super("Item Inventory Application");
setSize(WIDE, HIGH);
setDefaultLookAndFeelDecorated(true);
con.setBackground(Color.BLUE);
con.setLayout(new FlowLayout());
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
错误：
Exception in thread "main" java.lang.StackOverflowError
at java.util.HashMap.get(HashMap.java:317)
at java.awt.VKCollection.findCode(AWTKeyStroke.java:885)
at java.awt.AWTKeyStroke.getVKValue(AWTKeyStroke.java:613)
at java.awt.AWTKeyStroke.getAWTKeyStroke(AWTKeyStroke.java:568)
at javax.swing.KeyStroke.getKeyStroke(KeyStroke.java:310)
at javax.swing.LookAndFeel.loadKeyBindings(LookAndFeel.java:436)
at javax.swing.LookAndFeel.makeComponentInputMap(LookAndFeel.java:388)
at javax.swing.plaf.basic.BasicMenuBarUI.getInputMap(BasicMenuBarUI.java:120)
at
javax.swing.plaf.basic.BasicMenuBarUI.installKeyboardActions(BasicMenuBarUI.java:106)
at javax.swing.plaf.basic.BasicMenuBarUI.installUI(BasicMenuBarUI.java:75)
at javax.swing.plaf.metal.MetalMenuBarUI.installUI(MetalMenuBarUI.java:65)
at javax.swing.JComponent.setUI(JComponent.java:664)
at javax.swing.JMenuBar.setUI(JMenuBar.java:136)
at javax.swing.JMenuBar.updateUI(JMenuBar.java:145)
at javax.swing.JMenuBar.<init>(JMenuBar.java:113)
at javax.swing.plaf.metal.MetalTitlePane$SystemMenuBar.<init>
( MetalTitlePane.java:846)
at javax.swing.plaf.metal.MetalTitlePane$SystemMenuBar.<init>
(MetalTitlePane.java:846)
at javax.swing.plaf.metal.MetalTitlePane.createMenuBar(MetalTitlePane.java:364)
at
javax.swing.plaf.metal.MetalTitlePane.installSubcomponents(MetalTitlePane.java:279)
at javax.swing.plaf.metal.MetalTitlePane.<init>(MetalTitlePane.java:178)
at javax.swing.plaf.metal.MetalRootPaneUI.createTitlePane(MetalRootPaneUI.java:318)
at
javax.swing.plaf.metal.MetalRootPaneUI.installClientDecorations(MetalRootPaneUI.java:272)
at javax.swing.plaf.metal.MetalRootPaneUI.propertyChange(MetalRootPaneUI.java:416)
at java.beans.PropertyChangeSupport.fire(PropertyChangeSupport.java:335)
at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:327)
at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:263)
at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:283)
at java.awt.Component.firePropertyChange(Component.java:8422)
at javax.swing.JComponent.firePropertyChange(JComponent.java:4510)
at javax.swing.JRootPane.setWindowDecorationStyle(JRootPane.java:444)
at javax.swing.JFrame.frameInit(JFrame.java:266)
at javax.swing.JFrame.<init>(JFrame.java:225)
at InventoryApp.DFrame.<init>(DFrame.java:30)
at InventoryApp.JSplash.<init>(JSplash.java:40)
at InventoryApp.JSplash.<init>(JSplash.java:37)
at InventoryApp.JSplash.<init>(JSplash.java:37)
at InventoryApp.JSplash.<init>(JSplash.java:37)
at InventoryApp.JSplash.<init>(JSplash.java:37)
at InventoryApp.JSplash.<init>(JSplash.java:37)
at InventoryApp.JSplash.<init>(JSplash.java:37)
at InventoryApp.JSplash.<init>(JSplash.java:37)
at InventoryApp.JSplash.<init>(JSplash.java:37)
at InventoryApp.JSplash.<init>(JSplash.java:37)
最后一行持续了大约 100 次