对内部类进行反射可以吗，请帮忙

Question

import java.util.Comparator;
public class ss {
    public abc() {
        String classname="DiskNameComparator";//类名是不固定的，程序运行中动态获得
        Comparator<DiskInResourceEntity> comp = (Comparator)Class.forName(classname).newInstance();
    }    //比较器
    class DiskNameComparator implements Comparator<DiskInResourceEntity> {
        @Override
        public int compare(DiskInResourceEntity obj1, DiskInResourceEntity obj2) {
            return obj1.getDiskName().compareTo(obj2.getDiskName());
        }
    }
}动态加载比较器(有n个比较器)
现在这样写，报错：java.lang.ClassNotFoundException: DiskNameComparator请问是什么原因

Answer 1

类没有找到……    Class.forName(classname) 这里的className是要包名.类名的,  DiskNameComparator？？？

Answer 2

我又试过了
全名com.mytest.ss.DiskNameComparator
还是不行，一样的错误

Answer 3

"com.mytest.ss$DiskNameComparator"吧。你打印下DiskNameComparator.class看看。

Answer 4

没看清楚题目！如果是内部类的话直接：包名.类名是是不可以的！
Class.forName("a.Aa$Bb") 需要这样子！a是包名 Bb是内部类……

Answer 5

用com.mytest.ss$DiskNameComparator，是对的
但是提示java.lang.InstantiationException执行Class.forName(classname)没错
执行newInstance报的错 java.lang.InstantiationExceptionDiskNameComparator实现了Comparator接口，但它本身是一个普通类，我也增加了无参构造方法，但还是提示InstantiationException异常，请问怎么回事？

Answer 6

http://811417208-qq-com.javaeye.com/blog/547027 看下这个，对你有帮助的！

Answer 7

代码：
public........ {
Class c = Class.forName("service.impl.StorageServiceImpl$DiskNameComparator");
comparatorSort = (Comparator)c.newInstance();
}
内部类
public class DiskNameComparator implements Comparator<DiskInResourceEntity> {
public DiskNameComparator() {}

@Override
public int compare(DiskInResourceEntity obj1, DiskInResourceEntity obj2) {
return obj1.getDiskName().compareTo(obj2.getDiskName());
}
}这个是完整错误
java.lang.InstantiationException: service.impl.StorageServiceImpl$DiskNameComparator
at java.lang.Class.newInstance0(Class.java:340)
at java.lang.Class.newInstance(Class.java:308)
at service.impl.StorageServiceImpl.findAllDiskByResourceGroupSort(StorageServiceImpl.java:311)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
at $Proxy44.findAllDiskByResourceGroupSort(Unknown Source)
at iCenterTest.BasicTest.testSort(BasicTest.java:65)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:82)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:240)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:180)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)