如何用java获取java中的常量 [英] how to get a constant in java with class

问题描述

基本上我需要为一个类获取一个常量，但是我没有该对象的实例，只有它的类。
在PHP中我会做常量（XYZ）;
是否有类似的方法在JAVA中检索常量？

basically I need to get a constant for a class however I have no instance of the object but only its class. In PHP I would do constant(XYZ); Is there a similar way of retrieving a constant in JAVA?

我需要它来促进动态getMethod调用

I need it to facilitate a dynamic getMethod call

Class parameterType = Class.forName(class_name);
object.setProperty(field name, field value, parameterType);

然后set属性方法将获得正确的方法并设置指定的属性，但是我无法获得使用int作为参数类型而不使用Interger.TYPE的方法

the set property method would then get the correct method and set the specified property, however I cant get a method which has int as parameter type without using Interger.TYPE

推荐答案

我不确定你想要什么。但是向你展示一个例子应该不会太难。

I am not sure what you want to get out. But it shouldn't be too difficult to show you an example.

假设你有一个带有属性栏的Class Foo。

Lets say you have a Class Foo with property bar.

Class Foo {
    private final String bar = "test";
    public String getBar() {return bar;}
}

现在到通过反思得到这个：

Now to get this through reflection you would:

Class fooClass = Foo.class;
Object fooObj = fooClass.newInstance();
Method fooMethod = fooClass.getMethod("getBar");
String bar = (String) fooMethod.invoke(fooObj);

现在你将获得bar变量中方法getBar（）的值

Now you will get value of method getBar() in bar variable

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