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/* package whatever; // don't place package name! */
 
import javax.Swing.JOptionPane;
 
class Radio{
	public double valor_radio, long_circ, area_circ;
	public Radio(){
		valor_radio=0;
		long_circ=0;
		area_circ=0;
	}
	public void lectura_datos(){
		valor_radio=Integer.parseInt(JOptionPane.showInputDialog("Ingrese el valor del radio"));
	}
	public void calcularLongitudCircunferencia(){
		lectura_datos();
		if (valor_radio>0){
			long_circ=2*3.1416*valor_radio;
			JOptionPane.showMessageDialog(null,"El valor de la circunferencia es: "+long_circ);
		}
		else{
			JOptionPane.showMessageDialog(null,"El valor ingresado no es válido");
		}
	}
	public void calcularAreaCircunferencia(){
		lectura_datos();
		if(valor_radio>0){
			area_circ=3.1416*(valor_radio)^2;
			JOptionPane.showMessageDialog(null,"El valor del área es: "+area_circ);
		}
		else{
			JOptionPane.showMessageDialog(null,"El valor ingresado no es válido");
		}
	}
 
}

Main.java:3: error: package javax.Swing does not exist
import javax.Swing.JOptionPane;
                  ^
Main.java:13: error: cannot find symbol
		valor_radio=Integer.parseInt(JOptionPane.showInputDialog("Ingrese el valor del radio"));
		                             ^
  symbol:   variable JOptionPane
  location: class Radio
Main.java:19: error: cannot find symbol
			JOptionPane.showMessageDialog(null,"El valor de la circunferencia es: "+long_circ);
			^
  symbol:   variable JOptionPane
  location: class Radio
Main.java:22: error: cannot find symbol
			JOptionPane.showMessageDialog(null,"El valor ingresado no es v?lido");
			^
  symbol:   variable JOptionPane
  location: class Radio
Main.java:28: error: bad operand types for binary operator '^'
			area_circ=3.1416*(valor_radio)^2;
			                              ^
  first type:  double
  second type: int
Main.java:29: error: cannot find symbol
			JOptionPane.showMessageDialog(null,"El valor del ?rea es: "+area_circ);
			^
  symbol:   variable JOptionPane
  location: class Radio
Main.java:32: error: cannot find symbol
			JOptionPane.showMessageDialog(null,"El valor ingresado no es v?lido");
			^
  symbol:   variable JOptionPane
  location: class Radio
7 errors

Standard output is empty