如何在Java中加载嵌套类？

我有以下java代码：

public class CheckInnerStatic { private static class Test { static { System.out.println("Static block initialized"); } public Test () { System.out.println("Constructor called"); } } public static void main (String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException { System.out.println("Inside main"); Class.forName("Test"); // Doesn't work, gives ClassNotFoundException //Test test = new Test(); // Works fine } } 

为什么class.forName("Test")在这里工作，而下一行工作正常？

Answer 1

使用Outer$Nested （无论嵌套类是否为静态）

 public class CheckInnerStatic { private static class Test { static { System.out.println("Static block initialized"); } public Test () { System.out.println("Constructor called"); } } public static void main (String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException { System.out.println("Inside main"); Class cls = Class.forName("CheckInnerStatic$Test"); //Test test = new Test(); } } 

Answer 2

您需要使用完全限定的类名，即yourpackage.CheckInnerStatic$Test （假设您定义了一个包，否则跳过该部分）。

Answer 3

 Class innerClass = Class.forName("com.foo.OuterClass$InnerClass");