Java：实现一个能够改变显示单词的字体风格和大小的GUI（第十三周）

不念不忘少年蓝@ 2022-05-15 03:16 72阅读 0赞

题目来源：大工慕课 [链接][Link 1]  
作者：Caleb Sung

# 题目要求 #

实现一个能够改变显示单词的字体风格和大小的GUI。

# 参考代码 #

import java.awt.BorderLayout;
    import java.awt.Font;
    
    import javax.swing.ButtonGroup;
    import javax.swing.JCheckBox;
    import javax.swing.JFrame;
    import javax.swing.JLabel;
    import javax.swing.JPanel;
    import javax.swing.JRadioButton;
    
    public class FontTest { 
        public static void main(String[] args) {
            new FontFrame();
        }
    }
    
    @SuppressWarnings("serial")
    class FontFrame extends JFrame { 
    
        JCheckBox bold = new JCheckBox("Bold");
        JCheckBox italic = new JCheckBox("Italic");
        JRadioButton small = new JRadioButton("Small");
        JRadioButton medium = new JRadioButton("Medium");
        JRadioButton large = new JRadioButton("Large");
        JRadioButton extra_large = new JRadioButton("Extra Large");
        int fontSize;
        JLabel display;
    
        public FontFrame() {
            setTitle("Change Font");
            setVisible(true);
            setDefaultCloseOperation(EXIT_ON_CLOSE);
    
            display = new JLabel();
            display.setText("The quick brown fox jump over the lazy dog.");
            display.setFont(new Font("Serif", Font.PLAIN, 10));
    
            add(display, BorderLayout.CENTER);
    
            JPanel btnp = new JPanel();
            btnp.add(bold);
            btnp.add(italic);
            btnp.add(small);
            btnp.add(medium);
            btnp.add(large);
            btnp.add(extra_large);
    
            ButtonGroup bg = new ButtonGroup();
            bg.add(small);
            bg.add(medium);
            bg.add(large);
            bg.add(extra_large);
            small.setSelected(true);
    
            add(btnp, BorderLayout.SOUTH);
    
            bold.addActionListener(e -> {
                changeFont();
            });
            italic.addActionListener(e -> {
                changeFont();
            });
            small.addActionListener(e -> {
                changeFont();
            });
            medium.addActionListener(e -> {
                changeFont();
            });
            large.addActionListener(e -> {
                changeFont();
            });
            extra_large.addActionListener(e -> {
                changeFont();
            });
    
            pack();
        }
    
        void changeFont() {
            int mode = Font.PLAIN;
            if (bold.isSelected())
                mode += Font.BOLD;
            if (italic.isSelected())
                mode += Font.ITALIC;
            if(small.isSelected())
                fontSize = 10;
            else if (medium.isSelected())
                fontSize = 20;
            else if (large.isSelected())
                fontSize = 30;
            else if (extra_large.isSelected())
                fontSize = 50;
            display.setFont(new Font("Serif", mode, fontSize));
            pack();
            validate();
        }
    }

# 运行效果 #

界面下方的选项卡中有单选也有复选框。详细效果请大家自己在实现后体验一下~  
![这里写图片描述][70]

[Link 1]: https://mooc.dlut.edu.cn/
[70]: /images/20220515/5965a06e5ec443f7a6c184095e5b1e6c.png