関連ワード:  how to create immutable object in java    how to create immutable object in javascript    how to create immutable object    how to create immutable object in python    how to create immutable object in c#    how to create custom immutable object in java    how to make date object immutable in java    how to make list object immutable in java    how to make an object immutable in typescript    how to make an object immutable in c#