[RESOLVED] Getting input from a user

[sid_19840]

Im just learning the basics of Java.Im stuck at something.

How do I get an input from a user.Eg-If I want to get a number(integer),I tried using BufferedReader,but isnt there an easier way,like for output I use System.out.println,is there something similar to input?

[ComputerJy]

You can instantiate a "java.util.Scanner" object it can read all kinds of input
p.s. Scanner exists for java 5 only

[manavo11]

Search for System.in

[sid_19840]

Im a bit confused with the answer's,My question is: Can System.in command be used in any way to get input from the user?

[ComputerJy]

Scanner s=new Scanner(System.in);

[System_Error]

In several ways.. The Scanner is 1.5

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

String crap = br.readLine();

[sid_19840]

ok,after declaring the buffered reader,how do I get it to read an integer or a float variable?

[fartman_900]

This is what you do:

String temp;
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
......
System.out.print("enter message here"); //prompt for user
temp=br.readLine();
.......

Then if you need it as an integer value, use Integer.parseInt(temp). I think there is the same thing for the float class to, I could be wrong.

[ychhuong]

You can try the following:


BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.print("Enter Integer value : ");
int x=Integer.parseInt(br.readLine()); //get user input and convert to Integer
System.out.print("Enter Float value : ");
float f = Float.parseFloat(br.readLine()); //convert to float
System.out.print("Enter Double value : ");
double d = Double.parseDouble(br.readLine());//convert to double


But don't forget to import package java.io.*

[sid_19840]

Thanks,one final question,does Buffered Reader require an Exception or anything to be written(like extends or implements) in the function where I use it?

[ychhuong]

BufferedReader is a class in java.io.*. The method readLine() of this class throws an execption. Here is a complete example.


import java.io.*;
public class UserInput{
public static void main(String args[]) throws IOException{
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.print("Enter Integer value : ");
int x=Integer.parseInt(br.readLine()); //get user input and convert to Integer
System.out.print("Enter Float value : ");
float f = Float.parseFloat(br.readLine()); //convert to float
System.out.print("Enter Double value : ");
double d = Double.parseDouble(br.readLine());//convert to double
}
}

[System_Error]

I recommend in a try-catch clause.

[sid_19840]

Thanks to all.

[shirazamod]

Can't you just use .readInt()?

[ychhuong]

No you cannot use .readInt(). There is no readInt() method of BufferedReader.