字符串
##追加字符串
NSMutableString *mutableString =[[NSMutableString alloc]initWithFormat:@"我是可变字符串"];
[mutableString appendString:@"--aa"];
[mutableString appendString:@"--bb"];
##追加字符串
NSMutableString *mutableString =[[NSMutableString alloc]initWithFormat:@"我是可变字符串"];
[mutableString appendString:@"--aa"];
[mutableString appendString:@"--bb"];
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：
本文标题：String
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