Java Basic data type comparison

Type	Thread Safety	Efficiency	Key points of Use
String	Whether	High	Cannot be modified, it is recommended to use the = "XXX" method to assign the value directly. Use Concat for extended operation.
StringBuffer	Is	Low	can be modified. Use append for extended operation.
StringBuilder	Whether	High	can be modified. Use append for extended operation.
ArrayList			It is recommended to remove inserts. It is faster to use the Get interface when traversing.
LinkedList			Delete Insert operation is used for a long while. Use iterators or foreach faster when traversing.

Java Basic data type comparison