Does Java compiler eliminate function calls from getters?

Question

Can I be sure that

private int value;
public int getValue() { return value; }

is compiled by compiler in the same way as

public int Value;

in the terms of number of instructions and execution time? I mean do modern compilers trying to make functions "inline" (c++ term)?

A dupe of http://stackoverflow.com/questions/1109995/do-getters-and-setters-impact-performance-in-c-d-java — Steve Atkinson, Oct 22 '12 at 15:42
BTW The JVM can inline up to two "virtual" methods, something a static compiler does not do. — Peter Lawrey, Oct 22 '12 at 15:51
What are virtual methods? From `C++` point of view, all methods in java are virtual. — Suzan Cioc, Oct 23 '12 at 13:47

score 4 · Accepted Answer · answered Oct 22 '12 at 15:40

4

No; the Java compiler will not change that.

However, the JITter probably will.

answered Oct 22 '12 at 15:40

SLaks

Indeed, the JIT optimizes it for you. – Gilberto Torrezan Oct 22 '12 at 15:41
@Gilberto Won't the JIT only optimize it if it discovers a need to? I'm not comfortable asserting a JIT will always optimize a "simple" getter (less so a more complex on) given there are multiple implementations and environments. – Dave Newton Oct 22 '12 at 15:44
6

@DaveNewton Programming in Java is an exercise of faith: you hope the GC will run, you hope the JIT will compile and optimize, you hope you write once and the program will run everywhere. Have faith, brother. ;-) – Gilberto Torrezan Oct 22 '12 at 15:47
I was thinking JIT is a compiling too. – Suzan Cioc Oct 22 '12 at 16:26

1 Answers1