painter.java

金旭亮的java教案

// Painter.java
// 在JPanel的一个子类中用鼠标绘图
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;

public class Painter extends JFrame
{
   // 绘图板
   private DrawJPanel myDrawJPanel;

   // 构造函数
   public Painter()
   {
      createUserInterface();//创建用户界面
   }

   // 创建所有的用户界面元素
   public void createUserInterface()
   {
      // 获取容器对象
      Container contentPane = getContentPane();

      // 不指定布局管理器，从而允许自由地摆放控件 
      contentPane.setLayout( null );
      
      // 创建绘图面板
      myDrawJPanel = new DrawJPanel();
      myDrawJPanel.setBounds( 0, 0, 300, 300 );
      contentPane.add( myDrawJPanel );

      
      setTitle( "Painter" ); // 设置窗体标题
      setSize( 300, 300 );   // 设置窗体大小
       setLocation(300,300);
      setVisible( true );    // 显示窗体

   } // end method createUserInterface

   //程序入口点
   public static void main( String[] args )
   {
      Painter application = new Painter();
      //允许关闭程序
      application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );

   } // end method main

} // end class Painter

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