import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
import java.awt.event.ActionEvent;
public class CheckAndRaidoDemo extends JFrame
                       implements  ActionListener{
  private JTextField textDemo;
  private JCheckBox ckbBold,ckbItalic;
  private JRadioButton rdbRed,rdbGreen,rdbBlack;
  private ButtonGroup btg ;
  private JPanel checkPanel,radioPanel;
  private Container container;
  private GridBagLayout Layout;
  private GridBagConstraints constraints;
  public CheckAndRaidoDemo() {
    super("文本處理");
    setSize(260,200);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    container=getContentPane();
  }
  //以設定的網格包布局向面板中添加組件
 private void addComponent(JPanel panel,GridBagLayout Layout,
               GridBagConstraints gbc,Component com,int row,int column,
                      int numRows,int numColumns,int Weightx,int Weighty){
   gbc.gridx=row;
   gbc.gridy=column;
   gbc.gridwidth=numRows;
   gbc.gridheight=numColumns;
   gbc.weightx=Weightx;
   gbc.weighty=Weighty;
   Layout.setConstraints(com,gbc);
   panel.add(com);
 }
 public void setLayout(){
   //向復選框面板添加組件
   checkPanel=new JPanel();
   checkPanel.setLayout(new GridLayout(2,1));
   ckbBold=new JCheckBox("加粗");
   ckbBold.addActionListener(this);//注冊監聽器
   ckbItalic=new JCheckBox("斜體");
   ckbItalic.addActionListener(this);
   checkPanel.add(ckbBold);
   checkPanel.add(ckbItalic);
   //向單選按鈕面板添加組件
   radioPanel=new JPanel();
   radioPanel.setLayout(new GridLayout(3,1));
   rdbRed=new JRadioButton("紅色");
   rdbRed.addActionListener(this);
   rdbGreen=new JRadioButton("綠色");
   rdbGreen.addActionListener(this);
   rdbBlack=new JRadioButton("黑色");
   rdbBlack.addActionListener(this);
   rdbBlack.setSelected(true);//設置單選按鈕為選中
   btg=new ButtonGroup();//創建按鈕組,向按鈕組添加單選按鈕。
   btg.add(rdbRed);
   btg.add(rdbGreen);
   btg.add(rdbBlack);
   radioPanel.add(rdbRed);
   radioPanel.add(rdbGreen);
   radioPanel.add(rdbBlack);
   //設置框架窗體布局
   Layout=new GridBagLayout();
   container.setLayout(Layout);
   constraints=new GridBagConstraints();
   constraints.anchor=GridBagConstraints.CENTER;
   //向框架窗口添加文本框
   textDemo=new JTextField("示例文字");
   constraints.fill=GridBagConstraints.HORIZONTAL;
   addComponent((JPanel)container,Layout,constraints,textDemo,0,0,2,1,100,30);
   //向框架窗口添加復選框面板
   constraints.fill=GridBagConstraints.BOTH;
   addComponent((JPanel)container,Layout,constraints,checkPanel,0,1,1,1,50,70);
   //向框架窗口添加單選按鈕
   constraints.fill=GridBagConstraints.BOTH;
   addComponent((JPanel)container,Layout,constraints,radioPanel,1,1,1,1,50,70);
 }
  public static void main(String[] args) {
    CheckAndRaidoDemo frame = new CheckAndRaidoDemo();
    frame.setLayout();
    frame.show();
  }
  public void actionPerformed(ActionEvent e) {
    int intBold = 0;//intBold和intItalic記錄字體樣式
    int intItalic = 0;
    //判斷是否單擊了復選框
    if (e.getSource()instanceof JCheckBox) {
      //判斷黑體復選框是否被選中
      intBold = (ckbBold.isSelected() ? Font.BOLD : Font.PLAIN);
      //判斷斜體復選框按鈕是否被選中
      intItalic = (ckbItalic.isSelected() ? Font.ITALIC : Font.PLAIN);
      //設置字體
      textDemo.setFont(new Font("Serif", intBold + intItalic, 12));
    }//判斷是否單擊了單選按鈕
    if(e.getSource() instanceof JRadioButton){
      if(rdbBlack.isSelected()){//判斷黑色單選按鈕是否為選中狀態
        textDemo.setForeground(Color.black);//設置字體顏色
      }
      if(rdbRed.isSelected()){
        textDemo.setForeground(Color.red);
      }
      if(rdbGreen.isSelected()){
        textDemo.setForeground(Color.green);
      }
    }
  }
}