Java IO

[S_Grimm]

Ok, I just finished reading the I\O tutorials in the Tutorial Section in java AND searched the wiki, but they both were about as clear as mud. I understand the import for strings, but i need to get int double, byte, short, or long into a variable that i can manipulate. For example

Java:

readInt(variable1); variable2 = Math.pow(variable1, 2); System.out.println (variable2);

So I guess what i need is this : How do i read int, double, long, etc... and store it in a variable?

Thanks in Advance
A\V

[btiffin]

There are multiple ways; here is one sampler

code:

String str = "42"; int i = Integer.parseInt(str); long l = Long.parseLong(str); String snum = "42.123"; float f = Float.parseFloat(snum); String sback = Float.toString(f);

Conversion errors can be trapped with judicious use of try/catch.

Hope that helps.

Cheers

[S_Grimm]

no, i sort of need a

Java:

Double variable1 //this code is going to be wrong, but it will show you what i want. System.in (variable1)

[wtd]

Let me ask you... can you use System.in to read in a String?

[[Gandalf]]

There is a nifty Scanner class in Java 1.5 and up that makes console input much nicer, Google it. It will also save you the String cast.

[S_Grimm]

yes. if you call it through BufferedReader

edit. alright. i got it to read an int. now is the time when we say how stupid i am and that biffin was right. i am a complete dumb***. sorry everybody...

now on to my next problem. I was trying to write a method that would allow me to call my own function to read int, but hit a snag. i'll post the code first. then go over my problem.

Java:

import java.io.*; public class read { public static void main (String [] args) throws IOException { int num; read in = new read(); num = in.readInt(); System.out.println (num); } public void readInt() throws java.io.IOException { InputStreamReader input = new InputStreamReader(System.in); BufferedReader reader = new BufferedReader (input); int Int; Int = Integer.parseInt(reader.readLine()); } }

now, if you take the "num = " out of the in.readInt(); and comment the int num; and System.out.println (num); , the code works fine. what i want to do is be able to have num = in.readInt(); and return a value. can anyone give me a hand with this?

edit2:
never mind. i had to stick a return and change it from void to int. Ill post the code just incase anyone else whats to look at it and try to suggest something else...

Java:

import java.io.*; public class read { public static void main (String [] args) throws IOException { int num; read in = new read(); num = in.readInt(); System.out.println (num); } public static int  readInt() throws java.io.IOException { InputStreamReader input = new InputStreamReader(System.in); BufferedReader reader = new BufferedReader (input); int Int; Int = Integer.parseInt(reader.readLine()); return Int; } }