publicclassGreedSnakeimplementsKeyListener{JFramemainFrame;CanvaspaintCanvas;JLabellabelScore;//计分牌SnakeModelsnakeModel=null;//蛇publicstaticfinalintcanvasWidth=200;publicstaticfinalintcanvasHeight=300;publicstaticfinalintnodeWidth=10;publicstaticfinalintnodeHeight=10;//-----------------------------