我正在尝试制作如下的打字导师：
这是我写的代码：
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.Arrays;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
/**
* Simple swing based typing tutor using frame
* @author
* @date
*/
public class TypingTutor extends JFrame implements KeyListener
{
//Individual keyboard rows
String firstRow[] = {"~","1","2","3","4","5","6","7","8","9","0","-","+","<<<<<"};//BackSpace
String secondRow[] = {"Tab","Q","W","E","R","T","Y","U","I","O","P","[","]","\\"};
String thirdRow[] = {"Caps","A","S","D","F","G","H","J","K","L",":","\"","Enter"};
String fourthRow[] = {"Shift","Z","X","C","V","B","N","M",",",".","?"," ^" };
String fifthRow[]={" " ,"<" ,"\\/",">" };
//all keys without shift key press
String noShift="`1234567890-=qwertyuiop[]\\asdfghjkl;'zxcvbnm,./";
//special charactors on keyboard that has to be addressed duing keypress
String specialChars ="~-+[]\\;',.?";
//Jbuttons corresponting to each individual rows
JButton first[];
JButton second[];
JButton third[];
JButton fourth[];
JButton fifth[];
//default color of the button to be repainted when key released
Color cc = new JButton().getBackground();
/*
* Invoked when a key has been pressed.
* @see java.awt.event.KeyListener#keyPressed(java.awt.event.KeyEvent)
*/
public void keyPressed(KeyEvent evt)
{
}//end of keypressed
/**
* Invoked when a key has been released.
*/
public void keyReleased(KeyEvent evt)
{
}
/*
* Driver main method to start the application
*/
public static void main(String[] args) {
//launch typing tutor
new TypingTutor().setVisible(true);
}
/*
* No argument construtor to create frame
*/
public TypingTutor()
{
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//set non resizable
this.setResizable(false);
//super.setSize(500,300);
//set size of the content pane ie frame
this.getContentPane().setPreferredSize(new Dimension(1000,600));
//super.getContentPane().setSize(800,400);
//set location for the frame
this.setLocation(50,50);
//init and paint frame
initWidgets();
}
/**
* Method to initialize frame component
*/
private void initWidgets()
{
//set the text area on top
JTextArea text = new JTextArea();
text.setPreferredSize(new Dimension(800,200));
//JScrollPane scrollPane = new JScrollPane(text);
//scrollPane.setPreferredSize(new Dimension(800, 200));
// add(typingArea, BorderLayout.PAGE_START);
// add(scrollPane, BorderLayout.CENTER);
//set the info label on top
JLabel info = new JLabel("<html>Type some text using your keyboard.The keys you press will be highlighted and text will be displayed.<br> Note : Clicking the buttons with your mouse will not perform any action. <br><br> </html>" );
//set the bold font for info
info.setFont(new Font("Verdana",Font.BOLD,14));
/*set the layout and place compomnet in place and pack it */
setLayout(new BorderLayout());
/*Various panel for the layout */
JPanel jpNorth = new JPanel();
JPanel jpCenter = new JPanel();
JPanel jpKeyboard = new JPanel();
JPanel jpNote = new JPanel();
add( jpNorth, BorderLayout.NORTH);
add( jpNote);
add( jpCenter, BorderLayout.CENTER);
add(jpKeyboard, BorderLayout.SOUTH);
jpNorth.setLayout(new BorderLayout());
jpNorth.add(info, BorderLayout.WEST);
jpNorth.add(info, BorderLayout.SOUTH);
jpCenter.setLayout( new BorderLayout());
jpCenter.add(text, BorderLayout.WEST);
jpCenter.add(text, BorderLayout.CENTER);
//add(text,BorderLayout.WEST);
// add(scrollPane,BorderLayout.CENTER);
//layout for keyboard
jpKeyboard.setLayout(new GridLayout(5,1));
//pack the components
pack();
/*paint first keyboard row and add it to the keyboard*/
first = new JButton[firstRow.length];
//get the panel for the row
JPanel p = new JPanel(new GridLayout(1, firstRow.length));
for(int i = 0; i < firstRow.length; ++i)
{
JButton b= new JButton(firstRow[i]);
b.setPreferredSize(new Dimension(100,50));
first[i] = b;
p.add(first[i]);
}
jpKeyboard.add(p);
/*paint second keyboard row and add it to the keyboard*/
second = new JButton[secondRow.length];
//get the panel for the row
p = new JPanel(new GridLayout(1, secondRow.length));
for(int i = 0; i < secondRow.length; ++i)
{
second[i] = new JButton(secondRow[i]);
p.add(second[i]);
}
jpKeyboard.add(p);
/*paint third keyboard row and add it to the keyboard*/
third = new JButton[thirdRow.length];
//get the panel for the row
p = new JPanel(new GridLayout(1, thirdRow.length));
for(int i = 0; i < thirdRow.length; ++i)
{
third[i] = new JButton(thirdRow[i]);
p.add(third[i]);
}
jpKeyboard.add(p);
/*paint fourth keyboard row and add it to the keyboard*/
fourth = new JButton[fourthRow.length];
//get the panel for the row
p = new JPanel(new GridLayout(1, fourthRow.length));
for(int i = 0; i < fourthRow.length; ++i)
{
fourth[i] = new JButton(fourthRow[i]);
p.add(fourth[i]);
if(i==fourthRow.length-2)
p.add(new JPanel());
}
p.add(new JPanel());
jpKeyboard.add(p);
//paint the fifth row
fifth = new JButton[fifthRow.length];
//get the panel for the row
p = new JPanel(new GridLayout(1, fifthRow.length));
/*put empty panel for layout adjustments */
for(int i = 0; i < 1; ++i)
{
JPanel spacePanel = new JPanel();
p.add(spacePanel);
}
/*draw the buttons */
for(int i = 0; i < fifthRow.length; ++i)
{
if(i==1) //space bar panel
{
JButton b = new JButton(fifthRow[i]);
b.setPreferredSize(new Dimension(400,10));
b.setBounds(10, 10, 600, 100);
fifth[i]=b;
//add empty panels for layout
p.add(new JPanel());p.add(new JPanel());p.add(new JPanel());p.add(new JPanel());p.add(new JPanel());p.add(new JPanel());p.add(new JPanel());p.add(new JPanel());
}
else
{
fifth[i]=new JButton(fifthRow[i]);
}
if(i==0) //first black panel
{
//place a black panel at first
JPanel spacePanel = new JPanel();
p.add(spacePanel);
}
p.add(fifth[i]);
}
jpKeyboard.add(p);
/*add listeners */
getContentPane().addKeyListener(this);
text.addKeyListener(this);
/*add listeners to all the button */
for(JButton b : first)
b.addKeyListener(this);
for(JButton b : second)
b.addKeyListener(this);
for(JButton b : third)
b.addKeyListener(this);
for(JButton b : fourth)
b.addKeyListener(this);
for(JButton b : fifth)
b.addKeyListener(this);
} //end of initWidgets
}//end of class
以上是非常简单的代码，但给了我以下布局：
问题描述：
对于键盘中的最后一行，我不得不将 Empty Jpanels 用于间距，我根本无法调整空格按钮的大小。它应该跨越 3 个常规按钮。请就此提出您宝贵的建议。