java在JLabel中不断更新和更改文本
所以我是Java新手，正在学习使用Swing，目前我正在从事讲师分配给我的一个项目。这是一个愚蠢的版本，是一种试图猜测用户键入的单词的暴力工具
我不想打印所有猜测的单词，而是想让它们显示在我UI上的JLabel中。（这会不断地发送不同的组合。）
但问题是：它只在我的程序运行完之后才显示一个猜测的单词（所以它找到了这个单词）
我四处搜索并寻找更新方法，但似乎找不到实际使用testField.setVisible(true);的地方
程序代码：
package gui;
import static com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type.Int;
import java.util.Random;
import java.util.Arrays;
import java.util.*;
public class bruteforcePanel extends javax.swing.JPanel {
String[] Alphabet = {"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"};
//String[] Alphabet = {"a"};
boolean startGuessing = false;
String pass;
String[] word;
String[] javaStuff;
List<String> guessedWord = new ArrayList<String>();
int amountOfGuesses;
String labelGuess;
private void startBruteforce(java.awt.event.ActionEvent evt) {
pass = textBoxPassword.getText();
//this.testField.setText(pass);
word = pass.split("");
//System.out.println(Arrays.toString(word));
startGuessing = true;
while(startGuessing == true) {
for (String i : word) {
Random r=new Random();
int randomNumber=r. nextInt(Alphabet. length);
String chosenLetter = Alphabet[randomNumber];
guessedWord.add(chosenLetter);
}
System.out.println(guessedWord);
labelGuess = String.join("", guessedWord);
this.testField.setText(labelGuess);
if (guessedWord.equals(Arrays.asList(word))) {
startGuessing = false;
System.out.println(amountOfGuesses);
} else {
guessedWord.clear();
amountOfGuesses += 1;
}
}
}
// Variables declaration - do not modify
private javax.swing.JButton bruteforceButton;
private javax.swing.JLabel jLabel1;
private javax.swing.JPanel jPanel1;
private javax.swing.JLabel testField;
private javax.swing.JTextField textBoxPassword;
// End of variables declaration
}
来自JPanel的代码：（位于private void startBruteforce(java.awt.event.ActionEvent evt) {}之前）
public bruteforcePanel() {
initComponents();
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
textBoxPassword = new javax.swing.JTextField();
bruteforceButton = new javax.swing.JButton();
jLabel1 = new javax.swing.JLabel();
testField = new javax.swing.JLabel();
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 146, Short.MAX_VALUE)
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 205, Short.MAX_VALUE)
);
bruteforceButton.setText("Bruteforce");
bruteforceButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
startBruteforce(evt);
}
});
jLabel1.setText("Word:");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
this.setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(151, 151, 151)
.addComponent(bruteforceButton))
.addGroup(layout.createSequentialGroup()
.addGap(15, 15, 15)
.addComponent(jLabel1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(testField)))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap(95, Short.MAX_VALUE)
.addComponent(textBoxPassword, javax.swing.GroupLayout.PREFERRED_SIZE, 215, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(90, 90, 90))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(29, 29, 29)
.addComponent(textBoxPassword, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(36, 36, 36)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
.addGroup(layout.createSequentialGroup()
.addGap(18, 18, 18)
.addComponent(bruteforceButton)
.addGap(9, 9, 9)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel1)
.addComponent(testField))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))))
);
}// </editor-fold>
就像我说的，我希望我的结果在标签上显示为“垃圾邮件”
# 1 楼答案
JLabel，而是使用JTextAreafirstWordLowerCaseVariablefirstWordLowerCaseMethod()FirstWordUpperCaseClassALL_WORDS_UPPER_CASE_CONSTANT您需要在
Timer的ActionListener内调用JPanel#revalidate()和JPanel#repaint()方法（按顺序），并且可能还需要在JScrollPane内包装JTextArea您需要使用
Swing Timer而不是while或任何其他类型的循环，因为它们会阻止EDT在循环完成之前进行更新