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好吧，我正在使用java swing編程一個GUI，我一直在使用一些舊代碼來創建一個移動的正方形，但是現在我必須使用切換按鈕來使某些形狀出現並從窗口中消失。我的程序應該有4個不同的切換按鈕（目前有3個），並且每個都有特定的用途：名稱將在屏幕中心顯示我的名字，矩形將在屏幕右下角顯示一個矩形，橢圓形也會在右下角顯示一個橢圓形。我曾嘗試使用一系列布爾值來指示出現哪種形狀，但出於某種原因，每個按鈕只會切換矩形，我不知道爲什麼。有什麼我做錯了，導致所有的按鈕做同樣的事情？ 這是我的代碼到目前爲止。第一個是我的paintPanel：如何讓每個切換按鈕執行不同的操作？
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class PaintPanel extends JPanel
{
private static Color[] colors =
{ Color.RED, Color.BLACK, Color.PINK, Color.ORANGE };
private int colorNumber = 0;
private int shape = 0;
private int x = 0;
private int y = 0;
private int width = 100;
private int height = 100;
private String display = " ";
private String none = " ";
private int dx = 2;
private int dy = 2;
private boolean rectangle = true;
private boolean oval= true;
private boolean Name = true;
private boolean special = true;
private String displayString = "hello";
private boolean isStarted = true;
/*public void update()
{
if (isStarted)
{
x += dx;
y += dy;
}
//dx ++;
//dy ++;
if (y + height > getHeight())
{
dy = -Math.abs(dy);
shape++;
colorNumber = (colorNumber+1)%colors.length;
}
else if (y < 0)
{
dy = Math.abs(dy);
shape++;
colorNumber = (colorNumber+1)%colors.length;
}
if (x + width > getWidth())
{
dx = -Math.abs(dx);
shape++;
colorNumber = (colorNumber+1)%colors.length;
}
else if (x < 0)
{
dx = Math.abs(dx);
shape++;
colorNumber = (colorNumber+1)%colors.length;
}
}*/
public void input()
{
System.out.print("Button");
}
public void changeColor()
{
colorNumber = (colorNumber+1) % colors.length;
}
/*public void startStop()
{
//if (isStarted == true) isStarted = false;
//else isStarted = true;
isStarted = !isStarted;
}
*/
public void setDisplayText(String dt)
{
displayString = dt;
}
public void paintComponent(Graphics g)
{
super.paintComponent(g);
int w = getWidth();
int h = getHeight();
int textx = x+w/2;
int texty = y+h/2;
FontMetrics fm = g.getFontMetrics();
int texth = fm.getHeight();
int textw = fm.stringWidth(display);
textx -= textw/2;
texty += texth/2;
texty -= 5;
if(Name == true)
{
g.setColor(Color.BLACK);
g.drawString(display, textx, texty);
Name = false;
}
else if(Name == false)
{
g.drawString(none, textx, texty);
Name = true;
}
if (oval == true)
{
g.setColor(Color.CYAN);
g.fillOval((5*w)/8, (5*h)/8, w/4, h/4);
oval = false;
}
else if(oval == false)
{
g.setColor(Color.WHITE);
g.fillOval((5*w)/8, (5*h)/8, w/4, h/4);
oval = true;
}
if(rectangle == true)
{
g.setColor(Color.PINK);
g.fillRect(w/2, h/2, w/2, h/2);
rectangle = false;
}
else if(rectangle == false)
{
g.setColor(Color.WHITE);
g.fillRect(w/2, h/2, w/2, h/2);
rectangle = true;
}
/*int w = getWidth();
int h = getHeight();
g.setColor(colors[colorNumber]);
if (shape % 2 == 0) //g.fillOval(x, y, width, height);
elseg.fillRect(x,y, width, height);
*/
/*
int textx = x+width/2;
int texty = y+height/2;
FontMetrics fm = g.getFontMetrics();
int texth = fm.getHeight();
int textw = fm.stringWidth(displayString);
textx -= textw/2;
texty += texth/2;
texty -= 5;
g.setColor(colors[(colorNumber+1)%colors.length]);
g.drawString(displayString, textx, texty);
*/
}
}
無論什麼被註釋掉是因爲它稍後會被實現爲一個特殊的按鈕。 這裏是我的主類：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class GuiTest extends JFrame
implements ActionListener
{
private Timer frameTimer;
private JToggleButton Name;
private JToggleButton oval;
private JToggleButton rectangle;
//private JTextField theText;
private PaintPanel paintPanel;
public GuiTest()
{
setTitle("Servando Hernandez");
setSize(500,500);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel topPanel = new JPanel();
topPanel.setLayout(new GridLayout(1,4));
Name = new JToggleButton("Name");
Name.addActionListener(this);
oval = new JToggleButton("Oval");
oval.addActionListener(this);
rectangle = new JToggleButton("Rectangle");
rectangle.addActionListener(this);
//theText = new JTextField("HI");
//theText.addActionListener(this);
topPanel.add(Name);
topPanel.add(oval);
topPanel.add(rectangle);
//topPanel.add(theText);
Container contentPane = getContentPane();
contentPane.setLayout(new BorderLayout());
contentPane.add(topPanel, BorderLayout.SOUTH);
paintPanel = new PaintPanel();
contentPane.add(paintPanel, BorderLayout.CENTER);
//frameTimer = new Timer(50, this);
//frameTimer.start();
}
public void actionPerformed(ActionEvent e)
{
//System.out.println("Action performed");
if (e.getSource() == oval)
{
paintPanel.input();
}
/*else if (e.getSource() == frameTimer)
{
paintPanel.update();
}*/
if (e.getSource() == rectangle)
{
paintPanel.input();
}
if (e.getSource() == oval)
{
//System.out.println("start/stop");
paintPanel.input();
}
if (e.getSource() == Name)
{
paintPanel.input();
String text = e.getActionCommand();
paintPanel.setDisplayText("Servando Hernandez");
//System.out.println(text);
}
repaint();
}
public static void main(String[] args)
{
GuiTest gui = new GuiTest();
gui.setVisible(true);
}
}
謝謝你，我一直很魯莽我的代碼，因爲這是我第一次搞GUI。但我很困惑，在修正中，你說明了橢圓==真，但那會做什麼？我的意思是切換按鈕不能用作布爾值。 – Servanh
@Servanh，這是一個錯字，我的意思是說'橢圓=真'。但是，再看一次，即使這是錯誤的。看看我的答案編輯。 – camickr
我現在明白了。這對我很有幫助。非常感謝您的編輯。 – Servanh