Learn to practice Java Object-oriented trapezoid area

1  PackageCom.hanqi;2 3  Public classLadder {4 5     DoubleShangdi;6     DoubleXiadi;7     DoubleGao;8     DoubleMianji;9     TenLadder (DoubleShangdi,DoubleXiadi,DoubleGao) One     { A         //using parameters to initialize properties -         //This represents the current class -          This. Shangdi =Shangdi; the          This. Xiadi =Xiadi; -          This. Gao =Gao; -          -     } +     //method naming: verb + name; verb First letter lowercase -     //void means no return value +     //return value type, to be written in front of method A     DoubleGetmianji () at     { -         //Calculate Area -Mianji = ( This. shangdi+ This. Xiadi) * This. Gao/2; -          -System.out.println ("area equals" + This. Mianji); -          in         //Return Statement -         return  This. Mianji; to     } +     //method of main used for testing -      Public Static voidMain (string[] args) the     { *         //Construction trapezoid $Ladder La =NewLadder (5,8,4);Panax Notoginseng          -         //output trapezoid Area the         DoubleMJ =La.getmianji (); +System.out.println ("received return value =" +MJ); A     } the      +      -      $      $}

Learn to practice Java Object-oriented trapezoid area