如何获取Java类的所有公共静态方法？

Question

clazz.getDeclaredMethods()将返回所有方法，但是我只想要那些public static方法，我该怎么做？

Answer 1

You need to check with the Modifier class after calling getModifiers on the Method objects

public static void main(String[] args) throws Exception {   //Read user input into the array
    Method method = Main.class.getDeclaredMethod("main", String[].class);
    int modifiers = method.getModifiers();
    System.out.println(modifiers);

    System.out.println(Modifier.isStatic(modifiers));
    System.out.println(Modifier.isPublic(modifiers));
    System.out.println(Modifier.isAbstract(modifiers));
}

prints

9
true
true
false

The int value holds information in specific bit positions for static , public , etc. modifiers.

Answer 2

you should iterate over the methods returned and check getModifiers() method. If it returns STATIC or not.

More info in the javadoc

Answer 3

Try using:

  Modifier.isStatic(method.getModifiers()).

Example:

public static List<Method> getStaticMethods(Class<?> clazz) 
{
    List<Method> methods = new ArrayList<Method>();

    for (Method method : clazz.getMethods()) 
    {
        if (Modifier.isStatic(method.getModifiers())) 
        {
            methods.add(method);
        }
    }
    return Collections.unmodifiableList(methods);

}