java - 如何将 class1 的 setText 设置为 class2？

Question

我在将 class1 中的字段文本设置为 class2 中的另一个字段时遇到问题。基本上，我有两个类(class)。在 class1 中，我有一个方法允许用户搜索文件中的单词(从文件中读取)，然后当找到该单词时，我想将其设置为 class2“field1”。

例如，如果我搜索“San”，则在 class2 中搜索的词应显示为“San”，第二个词应显示为“Aya”。

我不知道哪里出错了，程序也没有显示任何错误。任何帮助将不胜感激。提前致谢。

文件.txt

三亚

public class MyFileReader {

    JTextField searchfield = new JTextField(10);
    JPanel panel = new JPanel();

    public MyFileReader() {
        panel.add(new JLabel("Search:"));
        panel.add(searchfield);
        panel.setLayout(new GridLayout(5, 2));
        int result = JOptionPane.showConfirmDialog(null, panel,
                "Search", JOptionPane.YES_NO_OPTION);
        if (result == JOptionPane.YES_OPTION) {
            MyContentManager contentManager = new MyContentManager();
            try {
                String stringSearch = searchfield.getText();
                BufferedReader bf = new BufferedReader(new FileReader("file.txt"));
                int linecount = 0;
                String line;
                ArrayList<String> list = new ArrayList<String>();
                while ((line = bf.readLine()) != null) {
                    list.add(line);
                    linecount++;
                    int indexfound = line.indexOf(stringSearch);
                    if (indexfound > -1) {
                        String[] word = line.split("\t");
                        String firstword = word[0];
                        String secondword = word[1];
                        contentManager.field1.setText(stringSearch);//This is the problem
                        contentManager.field2.setText(secondword);//This is the problem
                    }
                }
                bf.close();
            } catch (IOException e) {
                System.out.println("IO Error Occurred: " + e.toString());
            }
        }
    }

    public static void main(String[] args) {
        new MyFileReader();
    }
}

类2

public class MyContentManager {

    JTextField field1 = new JTextField(10);
    JTextField field2 = new JTextField(10);
    JPanel panel = new JPanel();

    public MyContentManager() {
        panel.add(new JLabel("Searched For:"));
        panel.add(field1);
        panel.add(new JLabel("Second word:"));
        panel.add(field2);
        panel.setLayout(new GridLayout(5, 2));
        int result = JOptionPane.showConfirmDialog(null, panel,
                "Search found", JOptionPane.YES_NO_OPTION);
    }
}

Answer 1

我会给你的第二类 setter 方法，让它生成一个可以通过 getter 方法获得的 JPanel，然后简单地将它显示在 JOptionPane 中(如果需要)。例如:

DamClass1.java

class DamClass1 {
   JTextField searchfield = new JTextField(10);
   JPanel panel = new JPanel();

   public DamClass1() {
      panel.add(new JLabel("Search:"));
      panel.add(searchfield);
      panel.setLayout(new GridLayout(5, 2));
      int result = JOptionPane.showConfirmDialog(null, panel, "Search",
            JOptionPane.YES_NO_OPTION);
      if (result == JOptionPane.YES_OPTION) {
         DamClass2 c2 = new DamClass2();
         String stringSearch = searchfield.getText();

         if (stringSearch.equals("Foo")) {
            c2.setField1(stringSearch);
            c2.setField2("Bar");

            int result2 = JOptionPane.showConfirmDialog(panel, c2.getPanel(),
                  "Search found", JOptionPane.YES_NO_OPTION);
         }

         // commented to make the code runnable for me.
         // try {
         // BufferedReader bf = new BufferedReader(new FileReader("file.txt"));
         // int linecount = 0;
         // String line;
         // ArrayList<String> list = new ArrayList<String>();
         // while ((line = bf.readLine()) != null) {
         // list.add(line);
         // linecount++;
         // int indexfound = line.indexOf(stringSearch);
         // if (indexfound > -1) {
         // String[] word = line.split("\t");
         // String firstword = word[0];
         // String secondword = word[1];
         // c2.field1.setText(stringSearch);//This is the problem
         // c2.field2.setText(secondword);//This is the problem
         // }
         // }
         // bf.close();
         // } catch (IOException e) {
         // System.out.println("IO Error Occurred: " + e.toString());
         // }
      }
   }

   public static void main(String[] args) {
      DamClass1 s1 = new DamClass1();
   }
}

DamClass2.java

class DamClass2 {
   private JTextField field1 = new JTextField(10);
   private JTextField field2 = new JTextField(10);
   private JPanel panel = new JPanel();

   public DamClass2() {
      panel.add(new JLabel("Searched For:"));
      panel.add(field1);
      panel.add(new JLabel("Second word:"));
      panel.add(field2);
      panel.setLayout(new GridLayout(5, 2));
   }

   public JPanel getPanel() {
      return panel;
   }

   public void setField1(String text) {
      field1.setText(text);
   }

   public void setField2(String text) {
      field2.setText(text);
   }
}

请在此处提问时努力发布格式更好的代码。