feat: 添加Java基础面试题和BigDecimal高精度计算文档

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添加了两篇Java相关的文档：
1. Java基础面试题，涵盖数据类型、面向对象、字符串、异常等核心知识点
2. BigDecimal高精度计算详解，包括创建、运算、舍入模式和使用工具类

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meowrain

2025-07-26 22:21:12 +08:00

parent e50a10e864

commit 26695b9a00

7 changed files with 635 additions and 0 deletions

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