Java equivalent of cin

[Gregory W. Ernest]

I am new to Java programming and I was wondering if anyone can tell me the
java equivalent to a cin>>...; that is normally used in c++. I want to get
user input and automatically assign it to a variable. So in other words what
would be the equivant java statement of this c++ statement:

1: cout<<"Enter a number.";
2: cin>>x; //This is what I really want to know. I already know the java
equivalent of the first statement.

 

[Harish]

yes System.out is the standard output of a java program.
and System.in is the standard input.
so try System.in.read...

 

[moongate]

The main difference being that System.in belongs to class InputStream,
which does not provide functionaly as rich as C++'s "cin"; instead, it
focuses on low-level, byte-oriented input operations. In most cases,
you will want to wrap System.in with filter objects that augment its
functionality (stream wrapping basically works as in C++). A common
wrapping would be something like

BufferedReader dis = new BufferedReader(new
InputStreamReader(System.in))

where BufferedReader augmented functionality allows you, for example,
to read character input line by line:

String line = bin.readLine();

Look for other wrappings based on your specific needs. You might want
to take a look at basic principles of Java I/O (e.g., the difference
between "Reader/Writer" and "Stream" classes) in a tutorial or a book.
MC

 

[gstkein]

A Java Cin like class

import java.io.*;


/**
* @author gstkein
*
*/
public class Cin {

public static int Int(){

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
int intInput=-1;
boolean invalido = true;

while (invalido) {
invalido=false;
try {
intInput = Integer.parseInt(br.readLine());
} catch (NumberFormatException e) {
// TODO Auto-generated catch block
//e.printStackTrace();
invalido=true;
} catch (IOException e) {
// TODO Auto-generated catch block
//e.printStackTrace();
invalido=true;
}
}
return intInput;
}

public static String String() {

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String input="";

try {
input = (br.readLine());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

return input;
}

public static void main(String[] args) {
// TODO Auto-generated method stub

System.out.print("Type your name: ");
String name = Cin.String();
System.out.print("Type a number: ");
int number = Cin.Int();
System.out.println(name);
System.out.println(number);



}

}