- hashcode
- intern
- subString
4.为什么设计成不可变类
https://blog.csdn.net/renfufei/article/details/16808775
https://blog.csdn.net/u013905744/article/details/52414111
String string1 = "abc"; String string2 = new String("abc"...
String[] str = new String[]{}; String[] str = new String[...
String类 String s = new String();String s1 = new String("H...
string user; string newuser; string password; string newp...
string user; string newuser; string password; string newp...
string user; string newuser; string password;string newpa...
Object ->String：String.valueOf(); int -> String：String.va...
String→String[]→int[] String →int int→String char[]→Strin...
https://stackoverflow.com/questions/37493241/swift-string...
String →int： String →double： int→String：
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