java - Is this utility class with 2 static methods threadsafe?

Question

The following Utility class calls within itself the same static methods, but has no shared global variables. But it looks like the method nameTo() is "shared" and an issue. Am I right with it, and that it's unsafe?

public class Utility 
{
    public static MyObject create_1(boolean b)
    {
        MyObject o = new MyObject();
        o.setName(nameTo(b));           
        return o;
    }

    public static MyObject create_2(boolean b)
    {
        MyObject o = new MyObject();
        o.setName(nameTo(b));           
        return o;
    }

    public static String nameTo(boolean b)
    {
        if(b)
            return "NameA";
        else
            return "NameB";         
    }
}

Answer 1

由于您的nameTo()方法是无状态的，因此在多线程上下文中没有问题。代码可以在线程之间尽可能多地共享。重要的是数据。

Answer 2

所有静态方法在线程之间共享。并且由于该nameTo()方法没有任何正在使用的共享状态，因此它是线程安全的。

class Utility{

  private static int sharedValue; //something like counter of how many times nameTo() is called

  public static String nameTo(boolean b){
     //logic

     sharedValue++; //this will not be thread safe as it is shared state and being updated  in parallel

  }
}

Answer 3

您没有 a 中的数据global state，因此我看不到任何线程安全问题。这些方法都没有改变任何shared data.