Example Input/Output in Java

Age.java

import java.io.*;

public class Age {
	public static void main(String [] args) throws IOException {

		InputStreamReader inStream = new InputStreamReader(System.in);
	    BufferedReader systemIn = new BufferedReader(inStream);

	    String my_name, greeting, myAge, variable;

	    greeting = "Hello ";

	    // Your input name, via terminal
	    System.out.println("Please introduce your name");
	    my_name = systemIn.readLine();

	    // Your input age
	    System.out.println("Please introduce your age");
	    myAge = systemIn.readLine();
	    
	    // Casting = Casteo
	    numeric_age = Double.parseDouble(myAge);
	    // numeric_age = Integer.parseInt(myAge);

	    // Concatenation
	    // Output
	    System.out.println(greeting + my_name + "! \nYour age is: " + myAge);
	}
}