单选按钮组控制字体大小

最新推荐文章于 2021-05-31 16:47:43 发布

原创最新推荐文章于 2021-05-31 16:47:43 发布 · 1.4k 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#radiobutton #button #string #class

swing 专栏收录该内容

32 篇文章

订阅专栏

该博客演示了一个Java Swing应用程序，通过单选按钮组（RadioButton）控制文本标签（JLabel）的字体大小。用户可以选择“小”、“中”、“大”和“特大”四种字体尺寸，点击按钮即时更改显示文本的字号。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

package swing;

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;

public class RadioButtonTest {
public static void main(String[] args) {
  EventQueue.invokeLater(new Runnable() {
   @Override
   public void run() {
    RadioButtonFrame frame = new RadioButtonFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);
   }
  });
}
}

class RadioButtonFrame extends JFrame {
public RadioButtonFrame() {
  this.setTitle("RadioButton Test");
  this.setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

  label = new JLabel("The quick brown fox jumps over the lazy dog.");
  label.setFont(new Font("Serif", Font.PLAIN, DEFAULT_SIZE));
  this.add(label, BorderLayout.CENTER);

  buttonPanel = new JPanel();
  group = new ButtonGroup();

  addRadioButton("Small", 8);
  addRadioButton("Medium", 12);
  addRadioButton("Large", 18);
  addRadioButton("Extra large", 36);

  this.add(buttonPanel, BorderLayout.SOUTH);
}

private void addRadioButton(String name, final int size) {
  boolean selected = size == DEFAULT_SIZE;
  JRadioButton button = new JRadioButton(name, selected);
  group.add(button);
  buttonPanel.add(button);

  ActionListener listener = new ActionListener() {
   @Override
   public void actionPerformed(ActionEvent event) {
    label.setFont(new Font("Serif", Font.PLAIN, size));
   }
  };

  button.addActionListener(listener);
}

public static final int DEFAULT_WIDTH = 400;
public static final int DEFAULT_HEIGHT = 200;

private JPanel buttonPanel;
private ButtonGroup group;
private JLabel label;

private static final int DEFAULT_SIZE = 12;
}