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Java是一种面向对象的编程语言，继承了C++的诸多优势，同时去除了多继承、指针等复杂难懂的特性，兼具功能强大与简洁易用的特点。作为静态面向对象语言的典型代表，它充分体现了面向对象的设计理念，支持程序员以清晰、优雅的逻辑处理复杂的编程任务 ...

1、 准备两个待合并的映射表，示例中通过新建获取，实际应用时应从数据库或其它数据源读取所需数据。 2、 调用putAll方法合并map时，需先判断对象是否为null。为避免map01为null导致无法合并map02，应新建一个map实例来确保操作顺利执行。