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https://github.com/donaldjohn/java-bible/blob/master/simple-java/string-and-array/README.md#字符串和数组
String的不可变是什么？https://github.com/donaldjohn/java-bible/blob/master/simple-java/string-and-array/diagram-to-show-java-strings-immutability.md
substring()如何工作？https://github.com/donaldjohn/java-bible/blob/master/simple-java/string-and-array/the-substring-method-in-jdk-6-and-jdk-7.md
为什么String是不可变的？https://github.com/donaldjohn/java-bible/blob/master/simple-java/string-and-array
使用""和构造函数创建字符串https://github.com/donaldjohn/java-bible/blob/master/simple-java/string-and-array
String是引用传递吗？https://github.com/donaldjohn/java-bible/blob/master/simple-java/string-and-array
length 和 length()https://github.com/donaldjohn/java-bible/blob/master/simple-java/string-and-array
如何检查数组是否有效包含一个值？https://github.com/donaldjohn/java-bible/blob/master/simple-java/string-and-array
https://github.com/donaldjohn/java-bible/blob/master/simple-java/string-and-array
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