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package calculadora;
import javax.swing.joptionpane;
public class velocidad {
  //atributos
  int tiempo; 
  int distancia; 
  int multiplicacion;  
 
 
 
  //metodos
  public void leernumeros(){
distancia = interger.parseint(joptionpane.showinputdialog("digite una distancia"));
tiempo = interger.parseint(joptionpane.showinputdialog("digite el tiempo"));
} 
 
 
 
  public void multiplicacion(){
    multiplicacion = distancia*tiempo;
  }
 
 
 
  public void mostrarresultados(){
    system.out.printin("la repuesta es:"+multiplcacion);
  }
 
 
}
  public class main {
    public static void main(string [] args){
      velocidad op = new velocidad();
      op.leernumeros();
      op.multiplicacion();
      op.mostrarresultados();
  }
        }
 

Main.java:3: error: class velocidad is public, should be declared in a file named velocidad.java
public class velocidad {
       ^
Main.java:31: error: class main is public, should be declared in a file named main.java
  public class main {
         ^
Main.java:2: error: cannot find symbol
import javax.swing.joptionpane;
                  ^
  symbol:   class joptionpane
  location: package javax.swing
Main.java:32: error: cannot find symbol
    public static void main(string [] args){
                            ^
  symbol:   class string
  location: class main
Main.java:13: error: cannot find symbol
distancia = interger.parseint(joptionpane.showinputdialog("digite una distancia"));
                              ^
  symbol:   variable joptionpane
  location: class velocidad
Main.java:13: error: cannot find symbol
distancia = interger.parseint(joptionpane.showinputdialog("digite una distancia"));
            ^
  symbol:   variable interger
  location: class velocidad
Main.java:14: error: cannot find symbol
tiempo = interger.parseint(joptionpane.showinputdialog("digite el tiempo"));
                           ^
  symbol:   variable joptionpane
  location: class velocidad
Main.java:14: error: cannot find symbol
tiempo = interger.parseint(joptionpane.showinputdialog("digite el tiempo"));
         ^
  symbol:   variable interger
  location: class velocidad
Main.java:26: error: cannot find symbol
    system.out.printin("la repuesta es:"+multiplcacion);
                                         ^
  symbol:   variable multiplcacion
  location: class velocidad
Main.java:26: error: package system does not exist
    system.out.printin("la repuesta es:"+multiplcacion);
          ^
10 errors

Standard output is empty