我在问这是非常不得已的手段,因为我无法找到任何与此随机数字游戏有关的问题的帮助。JLabel无法在ActionListener中正确识别
问题是,当我尝试运行该程序时,ActionListener中出现错误,指出“guessResult无法解析”。
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.Random;
public class Project8 extends JFrame
{
private JTextField numGuessFld;
private JButton guessBtn, guessAgainBtn, playAgainBtn;
private int randNum;
private Container c = getContentPane();
private int numGuessed;
private Random rn = new Random();
public static void main(String[] args)
{
Project8 frm = new Project8();
frm.setSize(400,150);
frm.setVisible(true);
frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}//end main
public Project8()
{
c.setLayout(new FlowLayout());
setTitle("Number Guessing Game");
JLabel gameDescriptLbl = new JLabel("I have a number between 1 and 1000. Can you guess my number?");
c.add(gameDescriptLbl);
JLabel numGuessLbl = new JLabel("Please enter your first guess. ");
c.add(numGuessLbl);
numGuessFld = new JTextField(4);
c.add(numGuessFld);
guessBtn = new JButton("Guess");
c.add(guessBtn);
guessAgainBtn = new JButton("Guess Again");
guessAgainBtn.setEnabled(false);
c.add(guessAgainBtn);
playAgainBtn = new JButton("Play Again?");
playAgainBtn.setEnabled(false);
c.add(playAgainBtn);
JLabel guessResult = new JLabel("");
c.add(guessResult);
Handler handler = new Handler();
numGuessFld.addActionListener(handler);
guessBtn.addActionListener(handler);
guessAgainBtn.addActionListener(handler);
playAgainBtn.addActionListener(handler);
randNum = rn.nextInt(1000)+1;
}//end constructor Project8
private class Handler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
if (e.getSource() == guessBtn)
{
String input = numGuessFld.getText();
numGuessed = Integer.parseInt(input);
System.out.println(numGuessed);
System.out.println(randNum);
if (numGuessed < randNum)
{
c.setBackground(Color.blue);
guessResult.setText("Too low!");
guessAgainBtn.setEnabled(true);
}
else if (numGuessed > randNum)
{
c.setBackground(Color.red);
guessResult.setText("Too high!");
guessAgainBtn.setEnabled(true);
}
else if (numGuessed == randNum)
{
c.setBackground(Color.yellow);
guessResult.setText("Correct!");
guessAgainBtn.setEnabled(false);
guessBtn.setEnabled(false);
numGuessFld.setBackground(Color.green);
numGuessFld.setEditable(false);
playAgainBtn.setEnabled(true);
}
}//end guessBtn if
if (e.getSource() == guessAgainBtn)
{
numGuessFld.setText("");
}//end guessAgainBtn if
if (e.getSource() == playAgainBtn)
{
c.setBackground(null);
numGuessFld.setText("");
guessAgainBtn.setEnabled(false);
guessBtn.setEnabled(true);
numGuessFld.setBackground(null);
numGuessFld.setEditable(true);
playAgainBtn.setEnabled(false);
randNum = rn.nextInt(1000)+1;
}//end playAgainBtn if
}//end ActionPerformed
}//end Handler
}//end Project8
任何帮助将不胜感激...特别是如果它在4:30之前到达:)谢谢!
好像你正在使用一些简单的文本编辑器。如果您使用Eclipse,Netbeans或IntelliJ IDEA等IDE,它们可以帮助您很多,因为它们能够在运行代码之前突出显示这些错误,并提供一些有用的提示。 – hage
@hage我正在使用eclipse,这是我跑到问题之前,甚至在我跑它之前。还是)感谢你的建议!我的“教授”(不是一个非常好的教授imho)使我们在课堂上使用JGrasp,但是我在我的闪存驱动器上使用了eclipse作为便携式应用程序,所以我编码并复制粘贴到JGrasp中。 – enderal
_特别是如果它在4:30之前到达 - 哈哈,在哪个时区作业截止时间? – kleopatra