コンストラクタ内でthisを使って他のコンストラクタを呼び出す場合、最初の行でなければなりません。 Java System to Multiply two Floating-Point Figures The float course can be a wrapper course for the primitive form float which contains several techniques to correctly manage a float value like converting it to your string representation, and vice-versa. In Swing its quite frequent to write ... https://jav-free67776.mdkblog.com/37866165/the-2-minute-rule-for-thisav