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Is Java pass-by-reference?
Does a List object get passed by reference? In other words, if I pass an ArrayList (java.util.ArrayList) object to a class, will it be automatically updated when I change it?
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It's passed by value of reference. So modifications to the object can be seen outside the function, but assigning the variable to a new object does not change anything outside the function. It's essentially the same as passing a pointer in C, or a reference type in Java.
The two most widely known and easy to understand approaches to parameter passing amongst programming languages are pass-by-reference and pass-by-value. Unfortunately, Python is “pass-by-object-reference”, of which it is often said: “Object references are passed by value.”
Lists are already passed by reference, in that all Python names are references, and list objects are mutable.
List<T> is a class, and all class instances are passed by reference.
in other word: If I pass an ArrayList (java.util.ArrayList) object to a class, will it be automatically updated when I change it?
Yes
Does the List object passed by reference?
Value of reference would get passed
public updateList(List<String> names){ //.. } Explanation
When you call updateList(someOtherList); the value of someOtherList which is a reference will copied to names (another reference in method, bit by bit) so now both of them are referring to same instance in memory and thus it will change
See
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