Array and ArratList区别

10. Difference between Array and ArrayList

ArrayList can hold primitive variable(the primitive variable will automatically wrap and unwrap when place in/out ArrayList),Array can hold primitive variable

Arraylist has a lot method(Remove, Add, Contains, IsEmpty, indexof, size, get), Array(can use length variable to get the length of an Array)

ArrayList can shrink when remove some elem, but Array can't

Array has to know the size at time it is created, ArrayList not need

To put an object in an Array, you need assign it to a specific location, ArrayList not need

 

ArrayList<String> myList=new ArrayList<String>();

String [] myString=new String[7];

 

String a=new String("whooo");

myList.add(a);

 

String a=new String("hiihi");