Java - java

como convertir este codigo a java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

/**
*
* @author javier
*/
public class Main {

/**
* @param args the command line arguments
*/
public static void main(String[] args) {
// TODO code application logic here
BufferedReader br;
int a;
int b;
int c;
float x1;
float x2;
float raiz;
int resultado;
br = new BufferedReader(new InputStreamReader(System.in));
try {
System.out.println("Introduce a:");
a = Integer.parseInt(br.readLine());
System.out.println("Introduce b:");
b = Integer.parseInt(br.readLine());
System.out.println("Introduce c:");
c = Integer.parseInt(br.readLine());
if (a == 0) {
System.out.println("Error: division entre cero");
} else {
raiz = (b * b) - 4 * (a * c);
if (raiz < 0) {
System.out.println("Error: raiz negativa(imaginaria)");
} else {
x1 = ((-1 * b) + (float) Math.sqrt((double) raiz)) / (2 * a);
x2 = ((-1 * b) - (float) Math.sqrt((double) raiz)) / (2 * a);
System.out.println("X1:"+x1);
System.out.println("X2:"+x2);

}
}
} catch (IOException ex) {
}
System.exit(0);
}
}

manual de java

aqui ahi un link ponde te explican desde el inicio todo sobre java espero que te sirva de algo.

http://manual-java.com/manualjava/introduccion-java.html

http://www.java2s.com/Tutorial/Java/CatalogJava.htm