The test case creates twoclass loaders, each with what appears to be the same classpath.
测试用例创建了两个类装入器,每个类装入器使用的类路径看起来相同。
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In other words, when twoclass loaders load different classes (that is, different bytecodes) with the same name, class loader constraints guarantee that there will be no type mismatch between them.