Java基本数据类型是开发者日常编码和面试中的高频考点。理解byte、short、int、long等类型的内存分布与取值范围，是把握溢出与转换规律的前提。自动装箱与Integer缓存池机制解释了为何127相等而128不相等；浮点精度丢失则警示在金额计算中应使用long或BigDecimal。从类型提升、复合赋值陷阱到并发环境 ...

Java 的 Integer.parseInt 要求传入的字符串必须全部由合法的十进制数字组成，只要有一个非数字字符——哪怕是末尾的 kg 两个字母——就会直接抛 NumberFormatException 。 崩溃堆栈里那句 For input string: "12.5kg" ，我估计每个做对接的开发者迟早都会遇见。

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