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=" -"; toInteger j=NewInteger (str1); + intnum1=J.intvalue (); -System. out. println ("num1="+num1); the //method Two: most commonly used *String str2=" -"; $ intNum2=Integer.parseint (str2);Panax NotoginsengSystem. out. println ("num2="+num2); - } the +}A binary conversion can only be converted to 0 to 36 binaryWhen using wrapper classes, when writing an integer x=null, a null pointer exception appears, and the workaround first determines whether it is null and the

{Some "hello world"} reason, here is the definition of enum optional:C code Enum optional Case None Case Some (T) Init () Init (_ Some:t) //allow use with in a Boolean context. Func getlogicvalue (), Bool // Haskell ' s Fmap, which was mis-named Func map Func getmirror ()-Mirror } Declaring as optional only needs to be followed by a type ? . Such as:C code var strvalue:string? //? The syntax sugar equivalent

What is a SQL injection attack? The so-called SQL injection attack is an attacker inserting a SQL command into a Web form's input domain or a page request query string, tricking the server into executing a malicious SQL command. In some forms, user-entered content is used directly to construct (or influence) dynamic SQL commands, or as input parameters to stored procedures, which are particularly susceptible to SQL injection attacks. Common SQL inject

Public Staticstring GetEncoding (String str) {string encode= "GB2312"; Try { if(Str.equals (NewString (str.getbytes (encode), encode))) {String s=encode; returns; } } Catch(Exception Exception) {} encode= "Iso-8859-1"; Try { if(Str.equals (NewString (str.getbytes (encode), encode))) {String S1=encode; returnS1; } } Catch(Exception exception1) {} encode= "UTF-8"; Try { if(Str.equals (NewString (str.getbytes (encode), encode))) {