我正在寻找解决此问题的快速方法：这是我的代码：
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.JTextField;
public class Directory{
public static void main(String args[]) throws IOException{
JFrame frame = new JFrame("Directory");
frame.setPreferredSize(new Dimension(300,300));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final JProgressBar searchprogress = new JProgressBar();
JPanel panel = new JPanel();
final JButton searchbutton = new JButton("Search");
final JTextField searchfield = new JTextField();
searchfield.setPreferredSize(new Dimension(100,30));
searchprogress.setPreferredSize(new Dimension(200, 30));
searchbutton.setLocation(100, 100);
/* Start Buffered Reader */
BufferedReader br = new BufferedReader(new FileReader("test1.txt"));
String housetype = br.readLine();
String housenumber = br.readLine();
String housestreet = br.readLine();
String housepostal = br.readLine();
String houseplace = br.readLine();
String seperation = br.readLine();
/* Finish Buffered Reader */
/* Start Content Code */
JButton done = new JButton("Done");
done.setVisible(false);
JLabel housetype_label = new JLabel();
JLabel housenumber_label = new JLabel();
JLabel housestreet_label = new JLabel();
JLabel housepostal_label = new JLabel();
JLabel houseplace_label = new JLabel();
/* Finish Content Code */
/* Start Button Code */
searchbutton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae)
{
String searchquery = searchfield.getText();
searchprogress.setValue(100);
searchfield.setEnabled(false);
if(searchquery.equals(housetype)){
System.out.println("We Have Found A Record!!");
}}
});
/* Finish Button Code */
/* Test Field */
/* End Test Field */
panel.add(searchfield);
panel.add(done);
panel.add(searchbutton);
panel.add(searchprogress);
frame.add(panel);
frame.pack();
frame.setVisible(true);
}
}
基本上，在我编写了这段代码之后，Eclipse告诉我必须将housetype的修饰符更改为final。这真的不会做，因为如果要通过不同的记录，我需要成为一个不断变化的值。
请帮我！ D：
最佳答案
您在这里有几种选择：
最快的方法是执行Eclipse告诉您的内容，实际上是Java告诉您这一点。为了能够在方法内部类内部使用方法局部变量，这些变量必须是最终变量。
另一种选择是在类定义之后立即将housetype变量声明为实例变量。但是，在静态main方法中使用它意味着变量也必须是静态的，这使其成为类变量。
另一种方法是保持代码不变，但声明一个额外的变量，如下所示，然后在内部类中使用house变量而不是housetype。请参阅下面的完整代码：
public class Directory {
public static void main(String args[]) throws IOException {
JFrame frame = new JFrame("Directory");
frame.setPreferredSize(new Dimension(300, 300));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final JProgressBar searchprogress = new JProgressBar();
JPanel panel = new JPanel();
final JButton searchbutton = new JButton("Search");
final JTextField searchfield = new JTextField();
searchfield.setPreferredSize(new Dimension(100, 30));
searchprogress.setPreferredSize(new Dimension(200, 30));
searchbutton.setLocation(100, 100);
/* Start Buffered Reader */
final List<String> housetypes = new ArrayList<String>();
String line = "";
BufferedReader br = new BufferedReader(new FileReader("test1.txt"));
while (line != null) {
line = br.readLine();
housetypes.add(line);
String housenumber = br.readLine();
String housestreet = br.readLine();
String housepostal = br.readLine();
String houseplace = br.readLine();
String seperation = br.readLine();
}
/* Finish Buffered Reader */
/* Start Content Code */
JButton done = new JButton("Done");
done.setVisible(false);
JLabel housetype_label = new JLabel();
JLabel housenumber_label = new JLabel();
JLabel housestreet_label = new JLabel();
JLabel housepostal_label = new JLabel();
JLabel houseplace_label = new JLabel();
/* Finish Content Code */
/* Start Button Code */
searchbutton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
String searchquery = searchfield.getText();
searchprogress.setValue(100);
searchfield.setEnabled(false);
for (String housetype : housetypes) {
if (searchquery.equals(housetype)) {
System.out.println("We Have Found A Record!!");
}
}
}
});
/* Finish Button Code */
/* Test Field */
/* End Test Field */
panel.add(searchfield);
panel.add(done);
panel.add(searchbutton);
panel.add(searchprogress);
frame.add(panel);
frame.pack();
frame.setVisible(true);
}
}
还有更多选择，但是这些是最快的。