Question

我正在尝试在类“学习”中创建一个内部类（按钮），但是我收到了一个错误。从我的记忆中，我现在的方式曾经为我工作，但现在它给了我一个错误。我做错了什么？这是代码：

package Lib;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.ScrollPaneConstants;

public class learn {
Socket s;
PrintWriter pw;
InputStreamReader read;
BufferedReader reader;

 public void setUpNetworking(){
try {
s = new Socket("24.7.31.101",5000);
pw = new PrintWriter(s.getOutputStream());
read = new InputStreamReader(s.getInputStream());
reader = new BufferedReader(read);
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public class button(){

}
public void go(){
JFrame f  = new JFrame();
JPanel p = new JPanel();
JPanel p2 = new JPanel();
JTextArea messages = new JTextArea();
JTextField userSend = new JTextField();
JButton sending = new JButton("Send");
JScrollPane message = new JScrollPane(messages);



userSend.setPreferredSize(new Dimension(300,22));
messages.setLineWrap(false);
messages.setPreferredSize(new Dimension(500,500));
messages.setEditable(false);
message.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
message.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);

p.add(message);
p2.add(userSend);
p2.add(sending);

f.add(p,BorderLayout.NORTH);
f.add(p2,BorderLayout.SOUTH);

f.setVisible(true);
f.setSize(new Dimension(600,600));

}
public static void main(String args[]){
learn l = new learn();
l.go();
}

}

Answer 1

<强>问题：

public class button(){}

创建class的格式错误，应该是

public class button{}

Answer 2

一个类在其声明中没有使用括号。它应该是

public class button {
                   ^ no parenthesis here
                   parenthesis are for methods only
}

创建内部类的麻烦

2 个答案: