How do you convert this String into a double?

Hi, in this code I want to convert String arg into a double. I'm trying to do this so that I can convert some string into a double in this calculator that I'm making. Here is the code:
public class par {
public static void main(String[] args) {
String str = "351";
double arg = new double(str); // should convert the string into a double
System.out.println(arg);
System.out.println(str);
I keep getting errors in line 4, if any of you could help me out here I'll be thankful, i'm kinda new to java and my search for java's equivalent of alof() (its a function in C libraries that converts char[] into a double)lead me to this.
Tony L.

Use the Following:
String num = "123.2";
double d = Double.parseDouble(num);

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How do you convert this String into a double?

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