我如何将标题放置在GUI窗口的顶部？

Question

我是编程和学习的新手。在GUI界面顶部放置JLabel“欢迎回来”时，我需要帮助。尽管我付出了很大的努力，但这个标签一直卡在中间。随时纠正我可以做得更好的代码中显示的任何其他错误。

public class MainMenu {

public static void main(String[] args) {

    JFrame frame = new JFrame("Main Menu");


    JPanel panel = new JPanel();
    panel.setBounds(30, 80, 400, 570);
    panel.setLayout(new GridLayout(3, 2, 15, 15));
    panel.setComponentOrientation(ComponentOrientation.LEFT_TO_RIGHT);





    JButton meals = new JButton("Meals");  
    meals.setFont(new Font("Helvetica", Font.BOLD, 24));
    meals.setOpaque(true);


    JButton reminder = new JButton ("Reminders");       
    reminder.setFont(new Font("Helvetica", Font.BOLD, 24));
    reminder.setOpaque(true);


    JButton shop = new JButton ("Shop");        
    shop.setFont(new Font("Helvetica", Font.BOLD, 24));
    shop.setOpaque(true);


    JButton sleep = new JButton ("Sleep Timer");       
    sleep.setFont(new Font("Helvetica", Font.BOLD, 24));
    sleep.setOpaque(true);


    JButton account = new JButton ("My Account");        
    account.setFont(new Font("Helvetica", Font.BOLD, 24));
    account.setOpaque(true);


    JButton aboutus = new JButton ("About Us");
    aboutus.setFont(new Font("Helvetica", Font.BOLD, 24));
    aboutus.setOpaque(true);


    JLabel label = new JLabel("Welcome back!");
    label.setLocation(240, 20);


    panel.add(meals);
    panel.add(reminder);
    panel.add(shop);
    panel.add(sleep);
    panel.add(account);
    panel.add(aboutus);

    frame.add(panel);
    frame.add(label);

    frame.setSize(480, 720);
    frame.setVisible(true);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

}

Answer 1

看看代码。面板在中间布局管理器（边框）上重新布置还有其他基于Layout的解决方案，但主要思想是相同的

import java.awt.BorderLayout;
import java.awt.ComponentOrientation;
import java.awt.Font;
import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class MainMenu {

public static void main(String[] args) {

    JFrame frame = new JFrame("Main Menu");
    //define a new layout
    frame.setLayout(new BorderLayout());
    //panel for label 
    JPanel topPanel = new JPanel();
    JPanel panel = new JPanel();
    panel.setBounds(30, 80, 400, 570);
    panel.setLayout(new GridLayout(3, 2, 15, 15));
    panel.setComponentOrientation(ComponentOrientation.LEFT_TO_RIGHT);

    JButton meals = new JButton("Meals");  
    meals.setFont(new Font("Helvetica", Font.BOLD, 24));
    meals.setOpaque(true);

    JButton reminder = new JButton ("Reminders");       
    reminder.setFont(new Font("Helvetica", Font.BOLD, 24));
    reminder.setOpaque(true);

    JButton shop = new JButton ("Shop");        
    shop.setFont(new Font("Helvetica", Font.BOLD, 24));
    shop.setOpaque(true);

    JButton sleep = new JButton ("Sleep Timer");       
    sleep.setFont(new Font("Helvetica", Font.BOLD, 24));
    sleep.setOpaque(true);

    JButton account = new JButton ("My Account");        
    account.setFont(new Font("Helvetica", Font.BOLD, 24));
    account.setOpaque(true);

    JButton aboutus = new JButton ("About Us");
    aboutus.setFont(new Font("Helvetica", Font.BOLD, 24));
    aboutus.setOpaque(true);

    JLabel label = new JLabel("Welcome back!");

    panel.add(meals);
    panel.add(reminder);
    panel.add(shop);
    panel.add(sleep);
    panel.add(account);
    panel.add(aboutus);

    topPanel.add(label);
    topPanel.setSize(200, 30);
    //rearrange panels on frame
    frame.add(topPanel, BorderLayout.NORTH);
    frame.add(panel, BorderLayout.CENTER);

    frame.setSize(480, 720);
    frame.setVisible(true);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

}