With the help of the negative wildcard, you can now express the "one and only one userName and anything else" rule as in Listing 4.
借助否定通配符(negative wildcard)，现在可以表示“有且仅有一个userName，但可以有任意多个任何其他元素”规则，如清单4所示。
In Listing 1, there are two possible implementations of a setter for a property that can only take on non-negative values.
在清单1中，有两个可能的用于特性的setter的实现，该特性只能接受非负数值。
Listing 4 unit tests illustrate various assert methods to perform positive and negative unit testing. It has the following test methods.
列表4中的单元测试列举了各种断言方法来执行正面与反面的单元测试。
This report outlines each, listing the positive and negative aspects of each standard. Current and future deployments of mobile TV broadcast networks are presented.
本报告对每个技术的优势、劣势进行分析，并对手机电视广播网络部署的现状与未来趋势进行了分析。
This report outlines each, listing the positive and negative aspects of each standard. Current and future deployments of mobile TV broadcast networks are presented.
本报告对每个技术的优势、劣势进行分析，并对手机电视广播网络部署的现状与未来趋势进行了分析。
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