public class FiveChess extends BaseWindow{
private Listener listener;
private Canvas canvas;
private Rectangle clickArea;
private static int N=20;
private static int DIV=15;
private Rectangle[][] rect=new Rectangle[N][N];
private String[][] flags=new String[N][N];
private boolean[][] dirty=new boolean[N][N];
private GC gc;
private int hot_i,hot_j;
private boolean flag=true;
/**
* listener is use to action in draw
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