Question

因此，我是Java的新手，正在学习使用Swing，并且我目前正在从事由讲师分配给我的项目。这是某种蛮力软件的愚蠢版本，试图猜测用户键入的单词。

我不想打印所有猜出的单词，而是希望将它们显示在UI上的JLabel中。（这会不断向不同组合发送垃圾邮件。）

但是问题是：它仅在我的程序完成运行（因此找到了单词）后才显示一个猜测的单词。

我已经四处搜寻并寻找一种更新方法，但是我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>

所以就像我说的，我希望我的结果在标签中“垃圾邮件”。

Answer 1

您不想为此任务使用JLabel，而是使用JTextArea
您需要停止使用坏词（即使在代码中也是如此）
遵循Java naming conventions并持续使用它们。
- firstWordLowerCaseVariable
- firstWordLowerCaseMethod()
- FirstWordUpperCaseClass
- ALL_WORDS_UPPER_CASE_CONSTANT
要使UI在完成新结果后进行更新，您将需要Swing Timer，例如：Creating an animated 4x4 grid in Java和jLabel won't show
您将需要在JPanel#revalidate()的{{1}}内部调用JPanel#repaint()和ActionListener方法（按此顺序），您可能需要将Timer也包裹在JTextArea内。

您需要使用JScrollPane而不是Swing Timer或任何其他类型的循环，因为它们会阻塞EDT，从而阻止其更新直到循环完成。

不断更新和更改JLabel中的文本

1 个答案: