我正在尝试制作一个简单的计算器来练习图形(我是一个完整的 GUI 菜鸟)。我在 Polyashenkos Calulator 和文本区域以及文本区域和按钮之间的空间之后有一些不需要的空间时遇到了一些问题。另外，我如何保持该布局但消除空间并使底部的 3 个按钮更小。任何有关我在做什么或如何做得更好的提示都将不胜感激。谢谢。

import javax.swing.*;
import java.awt.*;

public class calculator {

    public static void main(String[] args) {
        // creates the JFrame(a window with decorations)
        JFrame frame = new JFrame("Calculator"); 
        // stops the program when window is closed
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
        frame.setSize(377, 350);

        // the main panel of the JFrame, 
        // remembet you cant add content directly to JFrame
        JPanel content = new JPanel(new GridLayout(4, 0)); 
        // panel for the text field
        JPanel textarea = new JPanel(new GridLayout(4, 0)); 
        // panel for the buttons, 
        // GridLayout(int rows, int cols, int horiz_gap, int vert_gap)
        JPanel buttonarea = new JPanel(new GridLayout(4, 5, 2, 2)); 

        //  the panel for the bigger bottom buttons
        JPanel secondbuttonarea = new JPanel(new GridLayout(1, 1, 2, 2)); 
        // the panel for the text on top
        JPanel label = new JPanel(); 
        content.add(label);
        content.add(textarea);
        content.add(buttonarea);
        content.add(secondbuttonarea);

        JLabel words = new JLabel("Polyashenko's Calculator", JLabel.CENTER);
        label.add(words);

        JTextField enterhere = new JTextField("0.", JTextField.CENTER);
        // will set the curser of the text bar on right side
        enterhere.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT); 
        textarea.add(enterhere);

        // makes a button called b1 with text in it
        JButton b1 = new JButton("BkSP"); 
        // adds the backspace button to the buttonarea panel
        buttonarea.add(b1); 
        JButton b2 = new JButton("CE");
        buttonarea.add(b2);
        JButton b3 = new JButton("C");
        buttonarea.add(b3);
        JButton b4 = new JButton("/");
        buttonarea.add(b4);
        JButton b5 = new JButton("sqrt");
        buttonarea.add(b5);
        JButton b6 = new JButton("7");
        buttonarea.add(b6);
        JButton b7 = new JButton("8");
        buttonarea.add(b7);
        JButton b8 = new JButton("9");
        buttonarea.add(b8);
        JButton b9 = new JButton("*");
        buttonarea.add(b9);
        JButton b10 = new JButton("%");
        buttonarea.add(b10);
        JButton b11 = new JButton("4");
        buttonarea.add(b11);
        JButton b12 = new JButton("5");
        buttonarea.add(b12);
        JButton b13 = new JButton("6");
        buttonarea.add(b13);
        JButton b14 = new JButton("-");
        buttonarea.add(b14);
        JButton b15 = new JButton("1/x");
        buttonarea.add(b15);
        JButton b16 = new JButton("1");
        buttonarea.add(b16);
        JButton b17 = new JButton("2");
        buttonarea.add(b17);
        JButton b18 = new JButton("3");
        buttonarea.add(b18);
        JButton b19 = new JButton("+");
        buttonarea.add(b19);
        JButton b20 = new JButton("+/-");
        buttonarea.add(b20);

        JButton b21 = new JButton("0");
        secondbuttonarea.add(b21);
        JButton b22 = new JButton(".");
        secondbuttonarea.add(b22);
        JButton b23 = new JButton("=");
        secondbuttonarea.add(b23);

        // adds the buttonarea panel to the main panel
        frame.getContentPane().add(content); 
        // makes the window visible, put at end of program
        frame.setVisible(true); 
    }
}

最佳答案

类(class)之一 Hovercraft Full Of Eels (-: forums.sun.com :-)

import java.awt.BorderLayout;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.Window;
import java.awt.event.*;
import javax.swing.*;

public class SciCalc {

    private static void createAndShowUI() {
        SciCalcGui gui = new SciCalcGui();
        SciCalcMenu menu = new SciCalcMenu(gui);
        JFrame frame = new JFrame("Calculator");
        frame.getContentPane().add(gui.getMainPanel());
        frame.setJMenuBar(menu.getJMenuBar());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        java.awt.EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                createAndShowUI();
            }
        });
    }

    private SciCalc() {
    }
}

class SciCalcGui {

    private static final String[][] STANDARD_BTN_TEXTS = {
        {"7", "8", "9", "/"}, {"4", "5", "6", "*"},
        {"1", "2", "3", "-"}, {"0", ".", "=", "+"}};
    private static final String[][] SCIENTIFIC_BTN_TEXTS = {
        {"sqrt", "1/x", "sin"}, {"%", "Exp", "cos"},
        {"x^y", "ln", "tan"}, {"x^2", "n!", "sec"}};
    private static final int GAP = 5;
    private static final Font BTN_FONT = new Font(Font.DIALOG, Font.BOLD, 20);
    private JPanel mainPanel = new JPanel();
    private JPanel sciPanel;
    private JTextField display = new JTextField();

    SciCalcGui() {
        display.setFont(BTN_FONT);
        JPanel standardPanel = createBtnPanel(STANDARD_BTN_TEXTS, "Standard");
        sciPanel = createBtnPanel(SCIENTIFIC_BTN_TEXTS, "Scientific");
        mainPanel.setLayout(new BorderLayout());
        mainPanel.setBorder(BorderFactory.createEmptyBorder(GAP, GAP, GAP, GAP));
        mainPanel.add(standardPanel, BorderLayout.CENTER);
        mainPanel.add(sciPanel, BorderLayout.WEST);
        mainPanel.add(display, BorderLayout.NORTH);
        sciPanel.setVisible(false);
    }

    public void sciPanelSetVisible(boolean visible) {
        sciPanel.setVisible(visible);
        Window win = SwingUtilities.getWindowAncestor(mainPanel);
        win.pack();
    }

    public JPanel getMainPanel() {
        return mainPanel;
    }

    private JPanel createBtnPanel(String[][] texts, String title) {
        JPanel btnPanel = new JPanel();
        int rows = texts.length;
        int cols = texts[0].length;
        btnPanel.setLayout(new GridLayout(rows, cols, GAP, GAP));
        for (int row = 0; row < texts.length; row++) {
            for (int col = 0; col < texts[row].length; col++) {
                JButton btn = new JButton(texts[row][col]);
                btn.setFont(BTN_FONT);
                btnPanel.add(btn);
            }
        }
        btnPanel.setBorder(BorderFactory.createTitledBorder(title));
        return btnPanel;
    }
}

class SciCalcMenu {

    private static final String STANDARD = "Standard";
    private static final String SCIENTIFIC = "Scientific";
    private SciCalcGui gui;
    private JMenuBar menuBar = new JMenuBar();
    private JMenuItem standardView;
    private JMenuItem scientificView;

    SciCalcMenu(SciCalcGui gui) {
        this.gui = gui;
        standardView = new JMenuItem(STANDARD, KeyEvent.VK_T);
        scientificView = new JMenuItem(SCIENTIFIC, KeyEvent.VK_S);
        ViewAction viewAction = new ViewAction();
        standardView.addActionListener(viewAction);
        scientificView.addActionListener(viewAction);
        standardView.setEnabled(false);
        JMenu viewMenu = new JMenu("View");
        viewMenu.setMnemonic(KeyEvent.VK_V);
        viewMenu.add(standardView);
        viewMenu.add(scientificView);
        menuBar.add(new JMenu("Edit"));
        menuBar.add(viewMenu);
        menuBar.add(new JMenu("Help"));
    }

    public JMenuBar getJMenuBar() {
        return menuBar;
    }

    private class ViewAction implements ActionListener {

        @Override
        public void actionPerformed(ActionEvent e) {
            String command = e.getActionCommand();
            if (command.equals(STANDARD)) {
                gui.sciPanelSetVisible(false);
                standardView.setEnabled(false);
                scientificView.setEnabled(true);
            } else if (command.equals(SCIENTIFIC)) {
                gui.sciPanelSetVisible(true);
                standardView.setEnabled(true);
                scientificView.setEnabled(false);
            }
        }
    }
}

关于java - JFrame中如何排列多个面板，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/16067894/