Question

I am trying to learn java from a C# background! I have found some nuances during my journey like C# doesn’t have an Integer as reference type it only has int as a primitive type; this lead me to a doubt if this translation would be correct!

  String line ="Numeric string";//Java
  string line = "Numeric string";//C#
  int size;

  size = Integer.valueOf(line, 16).intValue(); //In Java

  size = int.Parse(line,System.Globalization.NumberStyles.Integer);//In C#

Answer 1

No, that’s not quite a valid translation – because the 16 in the Java code means it should be parsed as an integer. The Java code is closer to:

int size = Convert.ToInt32(line, 16);

That overload of Convert.ToInt32 allows you to specify the base.

Alternatively you could use:

int size = int.Parse("11", NumberStyles.AllowHexSpecifier);

I’m not keen on the name “allow hex specifier” as it suggests that a prefix of “0x” will be accepted… but in reality it means it’s always interpreted as hex.