新手问题，帮忙看看这段代码__public_import_TempFrame_TempPanel_new_

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新手问题，帮忙看看这段代码

来源: 互联网发布时间：2017-04-26

本文导语: import java.awt.*; import java.awt.geom.*; import java.util.*; import java.awt.event.*; import javax.swing.*; public class TempSketch { public static void main(String[] args) { TempFrame frame=new TempFrame(); frame.setDefaultCloseOperation(JFrame...

import java.awt.*;
import java.awt.geom.*;
import java.util.*;
import java.awt.event.*;
import javax.swing.*;

public class TempSketch
{
  public static void main(String[] args)
  {
    TempFrame frame=new TempFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.show();
  }
}

class TempFrame extends JFrame
{
  public TempFrame()
  {
    setTitle("Temp Sketch");
    setSize(frmWidth,frmHeight);
    TempPanel panel=new TempPanel();
    Container contentPane=getContentPane();
    contentPane.add(panel);
  }
  private static int frmWidth=400;
  private static int frmHeight=110;
}

class TempPanel extends JPanel
{
  public TempPanel()
  {
    setBackground(Color.black);
    last=new Point2D.Double(10,10);
    lines=new ArrayList();
    addKeyListener(new KeyAction());
  }

  public boolean isFocusTraversable()
  {
    return true;
  }

  public void addline(int dx,int dy)
  {
    Point2D end=new Point2D.Double(last.getX()+dx,last.getY()+dy);
    Line2D line=new Line2D.Double(last,end);
    lines.add(line);
    repaint();
    last=end;
  }

  public void paintComponent(Graphics g)
  {
    super.paintComponent(g);
    g.setColor(Color.white);
    Graphics2D g2=(Graphics2D)g;
    for(int i=0; i