初学java反射的问题 一直抛出classnotfoundexception

Question

public class TestReflection {

public static void main(String[] args) {
    try{
        String str = "T";
        Class c = Class.forName(str);
        c.newInstance();
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    } catch (InstantiationException e) {
        e.printStackTrace();
    } catch (IllegalAccessException e) {
        e.printStackTrace();
    }
}

}

class T {

static {
    System.out.println("T Loaded!");
}

int i;
String s;

public void m (int i) {
    this.i = i;
}

public String getS() {
    return s;
}

}

抛出的异常如下：
java.lang.ClassNotFoundException: T
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:191)
at TestReflection.TestReflection.main(TestReflection.java:8)

Answer 1

通过反射实例化类时传递的类名称必须是全路径名称的。测试了下，修正T 的类名称为全路径就好了。