Question

有人可以指导我如何将这两个类合并到一个文件中？一个是构造函数类，另一个是main。

感谢;

主类：

public class JHelloDemo
{
   public static void main(String[] args)
   {
      JHelloFrame frame = new JHelloFrame();
      frame.setVisible(true);
   }
}

构造函数类：

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class JHelloFrame extends JFrame implements ActionListener{
   JLabel question = new JLabel("What is your name?");
   Font bigFont = new Font("Arial", Font.BOLD, 16);
   JTextField answer = new JTextField(10);
   JButton pressMe = new JButton("Press me");
   JLabel greeting = new JLabel("");
   final int WIDTH = 275;
   final int HEIGHT = 225;
   public JHelloFrame(){
      super("Hello Frame");
      setSize(WIDTH, HEIGHT);
      setLayout(new FlowLayout());
      question.setFont(bigFont);
      greeting.setFont(bigFont);
      add(question);
      add(answer);
      add(pressMe);
      add(greeting);
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      pressMe.addActionListener(this);
      }
   @Override
   public void actionPerformed(ActionEvent e){
      String name = answer.getText();
      String greet = "Hello, " + name;
      greeting.setText(greet);
   }
}

Answer 1

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class JHelloFrame extends JFrame implements ActionListener{
   JLabel question = new JLabel("What is your name?");
   Font bigFont = new Font("Arial", Font.BOLD, 16);
   JTextField answer = new JTextField(10);
   JButton pressMe = new JButton("Press me");
   JLabel greeting = new JLabel("");
   final int WIDTH = 275;
   final int HEIGHT = 225;
   public JHelloFrame(){
      super("Hello Frame");
      setSize(WIDTH, HEIGHT);
      setLayout(new FlowLayout());
      question.setFont(bigFont);
      greeting.setFont(bigFont);
      add(question);
      add(answer);
      add(pressMe);
      add(greeting);
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      pressMe.addActionListener(this);
      }
   @Override
   public void actionPerformed(ActionEvent e){
      String name = answer.getText();
      String greet = "Hello, " + name;
      greeting.setText(greet);
   }

   public static void main(String[] args)
   {
      JHelloFrame frame = new JHelloFrame();
      frame.setVisible(true);
   }
}

你去了

Answer 2

您可以简单地将main（）方法移动到JHelloFrame，这是您问题的答案。但是，您现有的设计将问题分开，所以我会不管它。

顺便说一下，你应该在Runnable中包装frame.setVisible（true）并将它传递给EventQueue.invokeLater（）。有关详细说明，请参阅this question。

将构造函数类与am主类组合在一起

2 个答案: