问题描述
class Rectangle {
double left,top,width,height;
Rectangle(this.left,this.top,this.width,this.height);
// Define two calculated properties: right and bottom.
double get right => left + width;
set right(double value) => left = value - width;
double get bottom => top + height;
set bottom(double value) => top = value - height;
var rect = Rectangle(3,4,20,15);
}
解决方法
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