如何将文本从class1设置为class2？

Question

我有一个问题，将class1中的字段文本设置为class2中的另一个字段。基本上，我有两个班。在class1中，我有一种方法允许用户搜索文件中的单词（从文件中读取），然后当找到单词时，我想将它设置为class2“field1”。

例如，如果我搜索“San”，在class2中搜索到的单词应显示“San”，而第二个单词应显示“Aya”。

我不知道哪里出错了，程序没有显示任何错误。任何帮助将不胜感激。提前致谢。

file.txt的

San Aya

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class2

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，让它产生一个可以通过getter方法获得的JPanel，并简单地将它显示在JOptionPane中（如果需要的话）。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); 
    } 
} 

请花心思后更好的格式化代码在这里问问题的时候。

Answer 2

Class2中被搜索之前建造的，你不得不推迟它的实例，并在其构造函数来设置添加两个参数具有适当值的字段。

JOptionPane显示在构造函数中，如果你想使用settter作为注释，你必须将对话框移动到这个setter。

Answer 3

你需要第二类更改为一些喜欢：

public class MyContentManager { 

    public int showFieldsFound(String first, String second) { 
     JTextField field1 = new JTextField(10); 
     field1.setText(first); 
     JTextField field2 = new JTextField(10); 
     field2.setText(second) 
     JPanel panel = new JPanel(); 
     panel.add(new JLabel("Searched For:")); 
     panel.add(field1); 
     panel.add(new JLabel("Second word:")); 
     panel.add(field2); 
     panel.setLayout(new GridLayout(5, 2)); 
     return JOptionPane.showConfirmDialog(null, panel, 
       "Search found", JOptionPane.YES_NO_OPTION); 
    } 
} 

这将涉及显示，当你发现他们的领域。现在，你的第一类需要做这样的事情：

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]; 
         int resultFromShowing = contentManager.showFieldsFound(stringSearch, secondWord); 
        } 
       } 
       bf.close(); 
      } catch (IOException e) { 
       System.out.println("IO Error Occurred: " + e.toString()); 
      } 
     } 
    } 

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

不知道你想要的东西从显示的话，结果做的，但我已经改变了第二类返回值。