drawfigureframe.java

《Java实例入门》所有实例的源代码。所有的源文件都是.java文件

package drawfigure;

import java.awt.*;
import java.awt.event.*;

public class DrawFigureFrame extends Frame implements ActionListener {
  private Menu drawMenu = new Menu("Draw");
  private MenuBar menuBar = new MenuBar();
  private MenuItem clearMenu = new MenuItem("Clear");
  private MenuItem lineMenu = new MenuItem("Line");
  private MenuItem rectMenu = new MenuItem("Rect");
  private MenuItem ovalMenu = new MenuItem("Oval");
  private MenuItem exitMenu = new MenuItem("Exit");
  private DrawFigurePanel panel = new DrawFigurePanel();

  public DrawFigureFrame(){
    setTitle("Draw Figure");
    setSize(400,300);
    drawMenu.add(clearMenu);
    drawMenu.addSeparator();
    drawMenu.add(lineMenu);
    drawMenu.add(rectMenu);
    drawMenu.add(ovalMenu);
    drawMenu.addSeparator();
    drawMenu.add(exitMenu);
    menuBar.add(drawMenu);
    setMenuBar(menuBar);

    addWindowListener(new WindowAdapter(){
                        public void windowClosing(WindowEvent e){
                          System.exit(0);
                        }
                      });
    clearMenu.addActionListener(this);
    lineMenu.addActionListener(this);
    rectMenu.addActionListener(this);
    ovalMenu.addActionListener(this);
    exitMenu.addActionListener(this);
    add(panel);
  }
  public void actionPerformed(ActionEvent e) {
    Object eventSource = e.getSource();
    if(eventSource == clearMenu){
      panel.setDrawStyle("clear");
      panel.repaint();
    }else if(eventSource == lineMenu){
      panel.setDrawStyle("line");
    }else if(eventSource == rectMenu){
      panel.setDrawStyle("rect");
    }else if(eventSource == ovalMenu){
      panel.setDrawStyle("oval");
    }else if(eventSource == exitMenu){
      System.exit(0);
    }

  }

}