Java 缺少一些东西来完成我的程序
我正在编写回文程序,并将其实现到JFrame中。如何在CalculateButtonHandler作用域的resultTF中显示结果一直困扰着我。任何帮助都将不胜感激 这是我的密码:Java 缺少一些东西来完成我的程序,java,jframe,palindrome,Java,Jframe,Palindrome,我正在编写回文程序,并将其实现到JFrame中。如何在CalculateButtonHandler作用域的resultTF中显示结果一直困扰着我。任何帮助都将不胜感激 这是我的密码: import java.awt.*; import javax.swing.*; import java.awt.event.*; import java.util.*; public class Exercise5 extends JFrame { private static final int Wid
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.util.*;
public class Exercise5 extends JFrame
{
private static final int Width = 400;
private static final int Height = 200;
private JLabel wordJL,resultJL;
private JTextField wordTF,resultTF;
private JButton checkJB,exitJB;
private CalculateButtonHandler checkHandler;
private ExitButtonHandler exitB;
public Exercise5()
{
setTitle ("Palindrome");
wordJL = new JLabel ("Enter a word: ", SwingConstants.RIGHT);
resultJL = new JLabel ("Result: ", SwingConstants.RIGHT);
wordTF = new JTextField(10);
resultTF = new JTextField(10);
checkJB = new JButton ("Calculate");
checkHandler = new CalculateButtonHandler();
exitJB = new JButton ("Exit");
exitB = new ExitButtonHandler();
exitJB.addActionListener (exitB);
Container pane = getContentPane();
pane.setLayout (new GridLayout (3,2));
pane.add(wordJL);
pane.add(wordTF);
pane.add(checkJB);
pane.add(exitJB);
pane.add(resultJL);
pane.add(resultTF);
setSize(Width, Height);
setVisible (true);
setDefaultCloseOperation (EXIT_ON_CLOSE);
}
private class CalculateButtonHandler implements ActionListener
{
public void actionPerformed (ActionEvent e)
{
if(e.getSource().equals(checkJB)) {
String pal1, pal2="";
pal1 = wordTF.getText();
int length = pal1.length();
for ( int i = length - 1 ; i >= 0 ; i-- ) {
pal2 = pal2 + pal1.charAt(i);
}
if (pal1.equals(pal2))
resultTF.setText("True");
else
resultTF.setText("False");
}
}
}
private class ExitButtonHandler implements ActionListener
{
public void actionPerformed (ActionEvent e)
{
System.exit(0);
}
}
public static void main (String[] args){
Exercise5 rectObject = new Exercise5();
}
}
您尚未添加
checkHandler
作为checkJB
的操作侦听器。。尝试:
checkJB = new JButton ("Calculate");
checkHandler = new CalculateButtonHandler();
checkJB.addActionListener(checkHandler); //THIS LINE!
当我在word文本字段中键入字符串时,它不会在结果文本字段@amirbawbno prob中给我任何结果,顺便说一句,您可能不需要它:
if(e.getSource().equals(checkJB))