checkandraidodemo.java

压缩包内是近180多个针对Java初学者编写的简单实例

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("文本处理");
    setSize(260,200);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    container=getContentPane();
  }
  //以设定的网格包布局向面板中添加组件
 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(){
   //向复选框面板添加组件
   checkPanel=new JPanel();
   checkPanel.setLayout(new GridLayout(2,1));
   ckbBold=new JCheckBox("加粗");
   ckbBold.addActionListener(this);//注册监听器
   ckbItalic=new JCheckBox("斜体");
   ckbItalic.addActionListener(this);
   checkPanel.add(ckbBold);
   checkPanel.add(ckbItalic);
   //向单选按钮面板添加组件
   radioPanel=new JPanel();
   radioPanel.setLayout(new GridLayout(3,1));
   rdbRed=new JRadioButton("红色");
   rdbRed.addActionListener(this);
   rdbGreen=new JRadioButton("绿色");
   rdbGreen.addActionListener(this);
   rdbBlack=new JRadioButton("黑色");
   rdbBlack.addActionListener(this);
   rdbBlack.setSelected(true);//设置单选按钮为选中
   btg=new ButtonGroup();//创建按钮组,向按钮组添加单选按钮。
   btg.add(rdbRed);
   btg.add(rdbGreen);
   btg.add(rdbBlack);
   radioPanel.add(rdbRed);
   radioPanel.add(rdbGreen);
   radioPanel.add(rdbBlack);
   //设置框架窗体布局
   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);
   //向框架窗口添加复选框面板
   constraints.fill=GridBagConstraints.BOTH;
   addComponent((JPanel)container,Layout,constraints,checkPanel,0,1,1,1,50,70);
   //向框架窗口添加单选按钮
   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记录字体样式
    int intItalic = 0;
    //判断是否单击了复选框
    if (e.getSource()instanceof JCheckBox) {
      //判断黑体复选框是否被选中
      intBold = (ckbBold.isSelected() ? Font.BOLD : Font.PLAIN);
      //判断斜体复选框按钮是否被选中
      intItalic = (ckbItalic.isSelected() ? Font.ITALIC : Font.PLAIN);
      //设置字体
      textDemo.setFont(new Font("Serif", intBold + intItalic, 12));
    }//判断是否单击了单选按钮
    if(e.getSource() instanceof JRadioButton){
      if(rdbBlack.isSelected()){//判断黑色单选按钮是否为选中状态
        textDemo.setForeground(Color.black);//设置字体颜色
      }
      if(rdbRed.isSelected()){
        textDemo.setForeground(Color.red);
      }
      if(rdbGreen.isSelected()){
        textDemo.setForeground(Color.green);
      }
    }
  }
}