Java 反射、类对象
我的目标是在命令行中读入我希望观察其信息的类的名称。当我在运行前知道类名时，就没有问题了。我似乎无法管理的是如何根据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();
}
}
}
main 方法中的 2 行注释显示了我过去在编译之前知道类名时所做的操作。以下未注释的行显示了我认为应该有效的内容，但我收到了 ClassNotFoundException。该类确实存在，所以我不确定我遇到了什么问题。
My objective is to read in to the command line the name of a Class I wish to observe info on. When I know the class name before runtime, I have no issue. What I can't seem to manage is how to create a class object based on a string input.
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. The following uncommented line shows what I thought should work, but I receive a ClassNotFoundException. The class certainly exists so I'm not sure what problem I'm having.
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评论（2）
两个建议：
"java.lang.Thread"而不仅仅是"Thread"）。Two suggestions:
"java.lang.Thread"and not just"Thread").Class.forName是在运行时按名称加载类的正确方法。要么你的论点是错误的，要么你的类不在类路径中。
Class.forNameis the right way to load a class by name at runtime.Either your argument is wrong or your class isn't in the classpath.