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(学習メモ)Java2級対策:問1要点(知識)

Last updated at Posted at 2020-07-03

Java
自己学習用メモ

問1要点整理  

  • Oya 
    - 継承 ー> Ko(Oyaのサブクラス) 
    - 継承 ー> Mago(Oyaのサブクラス)

  • this はスーパークラスでもサブクラスでも使用OK

  • java.io.FileOutpuStreamクラスは
    java.lang.Objectクラスのサブクラス

  • Javaは「多重継承」NG!!
    サブクラスはスーパークラスの属性・操作を引き継ぐことができる
    スーパークラスの参照変数には、
    サブクラスのオブジェクトを代入OK!

--------- TBE -------------

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