Java 如何使用反射检查方法是否是静态的？
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原文地址: http://stackoverflow.com/questions/287645/
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How can I check if a method is static using reflection?
提问by Telcontar
I want to discover at run-time ONLY the static Methods of a class, how can I do this? Or, how to differentiate between static and non-static methods.
我只想在运行时发现类的静态方法，我该怎么做？或者，如何区分静态和非静态方法。
采纳答案by Tom Hawtin - tackline
Use Modifier.isStatic(method.getModifiers()).
使用Modifier.isStatic(method.getModifiers()).
/**
* Returns the public static methods of a class or interface,
* including those declared in super classes and interfaces.
*/
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);
}
Note: This method is actually dangerous from a security standpoint. Class.getMethods "bypass[es] SecurityManager checks depending on the immediate caller's class loader" (see section 6 of the Java secure coding guidelines).
注意：从安全的角度来看，这种方法实际上是危险的。Class.getMethods “根据直接调用者的类加载器绕过 [es] SecurityManager 检查”（请参阅 Java 安全编码指南的第 6 节）。
Disclaimer: Not tested or even compiled.
免责声明：未经测试甚至编译。
Note Modifiershould be used with care. Flags represented as ints are not type safe. A common mistake is to test a modifier flag on a type of reflection object that it does not apply to. It may be the case that a flag in the same position is set to denote some other information.
注意Modifier应谨慎使用。表示为整数的标志不是类型安全的。一个常见的错误是在不适用的反射对象类型上测试修饰符标志。可能会出现在相同位置设置标志以表示某些其他信息的情况。
回答by Daniel Spiewak
To flesh out the previous (correct) answer, here is a full code snippet which does what you want (exceptions ignored):
为了充实之前的（正确）答案，这里有一个完整的代码片段，它可以满足您的需求（忽略异常）：
public Method[] getStatics(Class<?> c) {
Method[] all = c.getDeclaredMethods()
List<Method> back = new ArrayList<Method>();
for (Method m : all) {
if (Modifier.isStatic(m.getModifiers())) {
back.add(m);
}
}
return back.toArray(new Method[back.size()]);
}
回答by bruno conde
You can get the static methods like this:
你可以得到这样的静态方法：
for (Method m : MyClass.class.getMethods()) {
if (Modifier.isStatic(m.getModifiers()))
System.out.println("Static Method: " + m.getName());
}
