摘要： class Lader{double above,height;static double bottom;void setAbove(double a){above=a;}void setBottom(double b){bottom=b;}double getAbove(){return above;}double getBottom(){return bottom;}}class Example4_4{public static void main(String arg[]){Lader.bottom=60;Lader laderOne,laderTwo;System.out.printl 阅读全文