...you can declare fields that are not static and final, and...
However, with abstract classes, you can declare fields that are not static and final, and define public, protected, and private concrete methods. With interfaces, al 抽象类于接口是相似的。 您不能instantiate他们,并且他们也许包含方法的混合宣称有或没有实施。 然而,与抽象类,您能宣称不是静态和最后...