関連ワード:  how to define a arraylist in java    how to declare a arraylist in java    how to initialize a arraylist in java    how to instantiate a arraylist in java    how to initialise a arraylist in java    how to define a new arraylist in java    how to define 2d arraylist in java    how to define empty arraylist in java    how to declare a new arraylist in java    how to initialize a 2d arraylist in java