我创建了一个对话框，让用户在内存中输入5种颜色。这一切都完全有效，只是一个轻微的美学问题。正确输入所有5种颜色或者输入不正确的颜色后，它会在对话框中擦除内容并打印消息＆＃34;抱歉！颜色不正确＆＃34;或者＆＃34;祝贺＆＃34;。它打印消息，但仍然可以在消息后面看到JTextField（左侧部分/裁剪）。
我尝试过使用hide（）和remove（）方法，但它们似乎无法正常工作（或者我不正确地使用它们），我尝试重新制作一个对话框或者我似乎无法解决这个问题。我做错了什么/如何让JTextField在完成后消失？提前感谢您的帮助！
以下是用户输入颜色不正确或全部正确的部分（txtName是JTextField）：
if(count == 6)//User either finished or entered a color incorrectly
{
//Entered color incorrectly
if(incorrect == true)
{
txtName.setEnabled(false); //Doesn't work
homeScreen.remove(txtName); //Doesn't work
labelName.setText("Incorrect! Sorry - Wrong color.");
//txtName.removeActionListener(new MyButtonListener());
}
else//Correctly finished the game.
{
labelName.setText("Congratulations - your memory skills are perfect!");
//txtName.removeActionListener(new MyButtonListener());
homeScreen.remove(txtName);//Doesn't work
}
}
这是我的整个程序（我无法在帖子中正确设置格式）：
package memorygame;
import java.util.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.FlowLayout;
public class MemoryGame
{
private JFrame homeScreen;
private JLabel labelName;
private JTextField txtName;
private JLabel correct;
Vector<String> name = new Vector();
private int count = 1;
private MyButtonListener listen1 = new MyButtonListener();
//Constructor - Method to be called when MemoryGame object called
public void MemoryGame ()
{
homeScreen = new JFrame();
homeScreen.setSize(400,200);
homeScreen.setTitle("Memory Game");
homeScreen.setDefaultCloseOperation(homeScreen.EXIT_ON_CLOSE);
homeScreen.setLayout(new FlowLayout());
labelName = new JLabel();
txtName = new JTextField(10);
createContents();
homeScreen.setVisible(true);
}//End Constructor
//Create components and add them to the window/dialog box
private void createContents()
{
labelName.setText("Enter the color " + count + ":");
System.out.println("The current count is: " + count);
homeScreen.add(labelName);
homeScreen.add(txtName);
txtName.addActionListener(new MyButtonListener());//Allows you to press enter to invoke action
}
//Upon user hitting enter
private class MyButtonListener implements ActionListener
{
public void actionPerformed (ActionEvent e)//When event occurs
{
Scanner in = new Scanner (System.in);//For program input
String answer = "";
//Make memColor an array for randomized colors
/*
Random r = new Random();
String[] memColors = new String[5];
String[] colors = {"red", "green", "blue", "yellow", "brown", "purple"};
for(int i =0; i < memColors.length; i++)
{
memColors[i] = colors[r.nextInt(6)];
}
*/
String memColor1 = "red";
String memColor2 = "black";
String memColor3 = "yellow";
String memColor4 = "green";
String memColor5 = "blue";
boolean incorrect = false;
//If answered incorrectly set count to 5(it'll be 6)
//And have a boolean for if count== 6 for congrats and failure
if(e.getSource() == txtName)
{
answer = txtName.getText();
System.out.println(answer);
}
else
{}
//Check if user entered Correct color, 1= Red, 2= Black, etc.
if(count == 1)
{
if(answer.equalsIgnoreCase(memColor1))
{
txtName.setText("");
}
else
{//Needs to be a custom message box
count = 5;
incorrect = true;
}
}
else if(count == 2)
{
if(answer.equalsIgnoreCase(memColor2))
{
txtName.setText("");
}
else
{
count = 5;
incorrect = true;
}
}
else if(count == 3)
{
if(answer.equalsIgnoreCase(memColor3))
{
txtName.setText("");
}
else
{
count = 5;
incorrect = true;
}
}
else if(count == 4)
{
if(answer.equalsIgnoreCase(memColor4))
{
txtName.setText("");
}
else
{
count = 5;
incorrect = true;
}
}
else if(count == 5)
{
if(answer.equalsIgnoreCase(memColor5))
{
txtName.setText("");
}
else
{
count = 5;
incorrect = true;
}
}
else
{
JOptionPane.showMessageDialog(null, "Something went wrong!");
}
count += 1;
//User has completed the game or entered a color incorrectly
if(count == 6)
{
if(incorrect == true) //Incorrect color
{
txtName.setEnabled(false);
homeScreen.remove(txtName);
labelName.setText("Incorrect! Sorry - Wrong color.");
//txtName.removeActionListener(new MyButtonListener());
}
else //Completed the game correctly
{
labelName.setText("Congratulations - your memory skills are perfect!");
//txtName.removeActionListener(new MyButtonListener());
homeScreen.remove(txtName);
}
}
else
{
labelName.setText("Enter the color " + count + ":");
}
}//End Listener
}//End Button class
public static void main(String[] args) {
//Show message box
//Randomize colors
JOptionPane.showMessageDialog(null, "How good is your memory?\nTry to memorize this color sequence:\n\n red black yellow green blue");
MemoryGame mem = new MemoryGame();
mem.MemoryGame();
}//End Main
}// End Class
答案 0 :(得分：1)
使用txtName.setVisible(false);代替homeScreen.remove(txtName);
基本上，如果您想致电remove，则需要revalidate和repaint容器......
您还需要确保在事件调度线程的上下文中创建UI，有关详细信息，请参阅Initial Threads
答案 1 :(得分：1)
更改代码
homeScreen.remove(txtName);
到
homeScreen.remove(txtName);
homeScreen.revalidate();
homeScreen.repaint();
remove()不暗示revalidate() + repaint()的原因是remove()不是原子的。呼叫者可能希望执行多个更新，即多个add()和remove()呼叫的序列。 revalidate()基本上“完成”您的“用户更新交易”，repaint()“将其推送到屏幕”。
作为旁注，如果对变量名执行一些微小的改进，您的代码将更容易理解和维护。什么是homeScreen？为什么称它为labelName - 什么名字？什么是txtName - 什么文字的名称？ count什么，冰淇淋？
我建议进行以下改进：
incorrect - ＆gt; isIncorrect（也将if (incorrect == true)更改为if (isIncorrect) homeScreen - ＆gt; mainFrame或仅frame（因为您只有一个框架）labelName - ＆gt; infoLabel或仅label（因为您只有一个标签 - 并删除JLabel correct，它未被使用）txtName - ＆gt; answerTextField count - ＆gt; answerCount 删除变量listen1，但未使用它。
另外，如果您查看执行if (count == 1)的代码和以下四个if子句，除了数字之外，它们都是相同的。阵列的完美情况。您可以将变量memColor*转换为数组String[] memColor。或许那就是Vector的用途。您可能希望使用ArrayList，在这种情况下，没有人使用Vector。