💻Java Master

implement 30. 串联所有单词的子串 https://leetcode.cn/problems/substring-with-concatenation-of-all-words and save cpp file locally and run java file using python please analysis extreme detailed in Chinese Language 1. 理解题目 2. 分析边界情况和约束 3. 设计算法和策略 extreme detailed 4. 实现 java 代码，并且对关键步骤注释 5. 将 java 代码保存到本地文件 & 测试和调试 6. 使用 Python 运行 java 代码

Explain self-reasoning for Java problem-solving.

Guide me through Java code testing.

What are Java-specific coding principles?