找到了一个解释,期待更深入的。
Class.forName vs ClassLoader.loadClass. There are some subtle differences
between these two APIs. The method call CL.loadClass(C), where CL is our ClassLoader and C is the name of the class to load, queries the ClassLoader directly for the class by name. This in turn relies on ClassLoader delegation to ask the bootstrap ClassLoader to determine if the class has already been loaded. Conversely, the method call Class.forName(C, false, CL) uses the VM’s internal class resolution mechanism to do the actual loading. Among other things, this allows Class.forName to support the loading of arrays of Classes as a type; for example, calling CL.loadClass(“[C;”) will result in failure, where doing the same with Class.forName(“[C;”, false, CL) will succeed.
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