当在Java中处理字符串时，确定一个字符串是否完全由大写或小写字符组成通常是必要的。
在本教程中，我们将探索执行此检查的不同方法。
2. 问题介绍
首先，让我们准备三个输入字符串：
static final String UPPER_INPUT = "1: COOL!";
static final String LOWER_INPUT = "2: cool!";
static final String MIXED_INPUT = "3: Cool!";
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