[英]Java Reflection, Class Objects
My objective is to read in to the command line the name of a Class I wish to observe info on. 我的目标是在命令行中读入我希望观察信息的类的名称。 When I know the class name before runtime, I have no issue. 当我在运行时之前知道类名时,我没有问题。 What I can't seem to manage is how to create a class object based on a string input. 我似乎无法管理的是如何基于字符串输入创建类对象。
public class Tester {
static void methodInfo2(Object obj) throws ClassNotFoundException {
//some stuff
System.out.print("Test!");
}
public static void main (String args[]) throws ClassNotFoundException{
String className = args[0];
System.out.println("Class: "+className);
//myclass2 mc = new myclass2();
//Class c = mc.getClass();
Class argClass = Class.forName(className);
try {
methodInfo2(argClass);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
}
The 2 commented out lines in the main method show what I have done in the past when I know the class name before I compile. main方法中的2个注释掉的行显示了我在编译之前知道类名的过去所做的事情。 The following uncommented line shows what I thought should work, but I receive a ClassNotFoundException. 以下未注释的行显示了我认为应该工作的内容,但是我收到了ClassNotFoundException。 The class certainly exists so I'm not sure what problem I'm having. 这个课肯定存在,所以我不确定我遇到了什么问题。
Two suggestions: 两个建议:
"java.lang.Thread"
and not just "Thread"
). 确保你给它一个完全限定的名字(例如"java.lang.Thread"
而不只是"Thread"
)。 Class.forName
is the right way to load a class by name at runtime. Class.forName
是在运行时按名称加载类的正确方法。
Either your argument is wrong or your class isn't in the classpath. 您的参数是错误的,或者您的类不在类路径中。
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