5、 调用vector1的addAll方法将vector2的所有元素添加进来，此时vector1即为两集合的并集，最后输出vector1的内容。

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A：JDK 26预定于2026年3月17日发布，包含10个主要新功能：原始类型模式匹配的第四次预览、提前时对象缓存、Vector API第十一次孵化、惰性常量和PEM编码的第二次预览、结构化并发第六次预览、deep reflection警告、G1 GC性能优化、HTTP/3支持，以及移除Java Applet API。

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Community driven content discussing all aspects of software development from DevOps to design patterns. Here are the most important concepts developers must know when they size Java arrays and deal ...