当一个字符串常量过长时，可以采取以下几种解决方案：
- 使用字符串连接符（+）将长字符串拆分为多个短字符串进行拼接。例如：
String longStr = "This is a very long string that needs to be split into multiple shorter strings for better readability."
String shortStr = "This is a very long string" + " that needs to be split" + " into multiple shorter strings" + " for better readability.";
- 使用字符串数组来存储长字符串的各个部分，并在需要时进行拼接。例如：
String[] strParts = {"This is a very long string", " that needs to be split", " into multiple shorter strings", " for better readability."};
String shortStr = String.join("", strParts);
- 将长字符串存储在外部文件中，然后在程序中读取该文件内容。例如：
String fileName = "longString.txt";
String longStr = "";
try {
BufferedReader reader = new BufferedReader(new FileReader(fileName));
String line;
while ((line = reader.readLine()) != null) {
longStr += line;
}
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
以上是常见的解决方案，具体使用哪种方法取决于实际需求和代码的可读性要求。
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