Use of integers

[Sappe]

Hi I'm really new to java and is trying stuff out as I learn them. I'm trying to make a calculator where you type in two numbers and they get added toghether. For some reason it doesn't work and the program is making up numbers of its' own! I really have no idea why. I'll post the hole code since it isn't big:

    public static void main (String [] args)throws Exception {
        
        int sum=0;
        int num1=2;
        int num2=2;
        char choice ='R';
       
        
        
        System.out.println("Type in your first number");
        System.out.flush();
        num1=(int)System.in.read();
        System.out.println("Type in your second number");
        System.out.flush();
        num2=(int)System.in.read();
        System.out.println("You now have the numbers" + num1);
        System.out.println("and" +num2);
        
        choice=(char)System.in.read();
        
        if ( choice == 'A' ) {
            sum=num1+num2; 
            System.out.println(sum);
        }
        
    }
    
}

The if statement is there because I want to add the option to choose what to do with the numbers but first I need this to work. What happens when I run the program is that it asks for my first number like it's supposed to and I enter it. The it askes for my second number but at the same time moves on to the other part. I entered a 5 as my first number and it looks like this:
Type in your first number
5
Type in your second number
You now have the numbers53
and 10


Anyone knows what I've done wrong? Thanks..

[ArchAngel added CODE tags]

[ArchAngel]

It's much better to read user input like this:

import java.io.*;

public class Test {
        public static void main(String[] args) throws IOException {
                // Setup a reader for standard in.
                BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
                // Get input from user.
                String line = reader.readLine();
                // Print out the line just entered by the user.
                System.out.println(line);
        }
}

[Sappe]

Will that work when I want to add the numbers later? I thought I needed an integer or a float for that. But I'm really new to Java Thanks BTW.

[ArchAngel]

Yes, you just convert the Strings into numbers of the appropriate type using Integer.parseInt(String) and Float.parseFloat(String) etc.

[Sappe]

Okey I've changed it to the way you said and added the parsings. But now when I want to add the numbers the IDE claims that they are strings and not ints so I can't do that. Here's the code:

import java.io.*;

public class UserInput {
    
    /** Creates a new instance of UserInput */
public static void main(String [] args)throws Exception {

int Sum = 0;



System.out.println("Type in your first number.");
System.out.flush();
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
String num1 = reader.readLine();
Integer.parseInt(num1);

System.out.println("Type in your second number.");
System.out.flush();
BufferedReader reader2 = new BufferedReader(new InputStreamReader(System.in));
String num2 = reader2.readLine();
Integer.parseInt(num2);
//Here I want to add the line Sum=num1+num2
System.out.println("The sum is" + Sum);
}

}

[ArchAngel]

The line:

Integer.parseInt(num1);

Does not convert a String variable into an int variable - that would make no sense. This method returns an int representation of the String argument:

int integerRepresentation = Integer.parseInt(stringRepresentation);