HelloName.java

From WikiJava

HelloName.java is a standalone program that asks for the name on the standard output (screen), reads the string given in standard input (keyboard), and writes a kind greeting to the user.

the article

HelloName.java is the simplest estension of HelloWorld.java.

It uses java.io.InputStreamReader to read characters from the System.in and inserts them into a java.io.BufferedReader so all the inserted character are then available as a java.lang.String for easier processing.

The InputStreamReader gets initialized with a InputStream which in this case is the standard input System.in. It is then wrapped into the BufferedReader which reads and inserts into a buffer the inserted characters.

the bufferedReader.readLine(); is then used to retrieve the first line (the characters pressed before the return).

HelloName.java

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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
 
 
/**
 * Hello Name
 * 
 * @author Giulio
 * @date 15/12/2007
 */
public class HelloName {
 
    /**
     * Prints on the default output a greeting to a person.
     * @param args
     * @throws IOException 
     */
    public static void main(String[] args) throws IOException {
	System.out.println("What's your name? ");
 
	// the BufferedReader is able to store some data for easier retrieval
	BufferedReader bufferedReader = new BufferedReader(
		new InputStreamReader(System.in));
	String name = bufferedReader.readLine();
 
	System.out.println("Hello " + name +"!!!");
    }
 
}

See Also

helloworld.java

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