将类作为参数传递给Java中的方法 [英] Passing a class as an argument to a method in java

问题描述

如果要将类传递给方法，我正在编写一种方法，其中部分代码包括检查对象是否属于某种类型.这就是我想要的(但显然不起作用):

I am writing a method were I would like to pass a class to a method, where a part of the code includes checking if the object is of a certain type. This is what I want (but which obviously doesn't work):

private static class MyClass1 { /***/ }
private static class MyClass2 { /***/ }

private void someFunc() {
    /* some code */
    methodName(MyClass1);
    methodName(MyClass2);
}


private void methodName(Class myClass) {
    Object obj;
    /* Complicated code to find obj in datastructure */
    if (obj instanceof myClass) {
        /* Do stuff */
    }
}

关于如何完成此操作的任何提示?谢谢！

Any hints as to how this can be done? Thanks!

推荐答案

Class 都具有

Class has both an isInstance() method and an isAssignableFrom() method for checking stuff like that. The closest to what you're looking for is:

if (myClass.isInstance(obj)) {

更新:您想在注释中将类的名称传递给方法，并检查是否有可分配给该类的东西.唯一的方法是将类名称作为String传递，然后加载该类并使用上述方法之一.例如(省略了异常处理):

Update: From your comment, you want to pass the name of a class into a method and check if something is assignable to that class. The only way to do that is to pass the class name as a String, then load the class and use one of the aforementioned methods. For instance (exception handling omitted):

private void methodName(String className) {
    Class myClass = Class.forName(className);
    Object obj;
    /* Complicated code to find obj in datastructure */
    if (myClass.isInstance(obj)) {
        /* Do stuff */
    }
}

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