Performance between public, protected, package and private

Hello!

I thought that I would see a performance improvement by making a method private instead of public. So I wrote this test program to prove my point. But I didn't see any improvment at all????.

So now is the question is there any performance improvement by making a method private instead of public, or have I dreamt it?

Best regards
Fredrik

Below is a testprogram that runs the same code within different methods (public, protected, package and private).

public class PerformanceTest
{
    long time;
    public PerformanceTest()
    {
        //Just a little warm up
        String str = new String("");
        for(int i = 0; i < 1000; i++)
            str = str + i;

        time = System.currentTimeMillis();
        publicMethod();
        time = System.currentTimeMillis() -time;
        System.out.println("public: " + time);

        time = System.currentTimeMillis();
        protectedMethod();
        time = System.currentTimeMillis() -time;
        System.out.println("protected: " + time);

        time = System.currentTimeMillis();
        packageMethod();
        time = System.currentTimeMillis() -time;
        System.out.println("package: " + time);

        time = System.currentTimeMillis();
        privateMethod();
        time = System.currentTimeMillis() -time;
        System.out.println("private: " + time);
    }

    public final void publicMethod()
    {
        String str = new String("");
        for(int i = 0; i < 3000; i++)
            str = str + i;
    }

    public void protectedMethod()
    {
        String str = new String("");
        for(int i = 0; i < 3000; i++)
            str = str + i;
    }

    void packageMethod()
    {
        String str = new String("");
        for(int i = 0; i < 3000; i++)
            str = str + i;
    }

    private void privateMethod()
    {
        String str = new String("");
        for(int i = 0; i < 3000; i++)
            str = str + i;
    }

    public static void main(String[] args)
    {
        new PerformanceTest();
    }
}