Elevar un número a una potencia en java Math.pow – Hard drive – Automovil – Phone – Hipotecario

Para elevar un número a una potencia n enjava usaremos el métodoMath.pow.

Math.pow(a, b) dondea es la base yb el exponente. Es decir, sí tenemosMath.pow(2, 3) el resultado sería 8 dado que 2^3 = 8 o lo que sería lo mismo 2*2*2.

Ejemplo Potencia:

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int n, base; System.out.println("Ingrese la base: "); base = tec.nextInt(); System.out.println("Ingrese el exponente"); n = tec.nextInt(); int resultado = (int) Math.pow(base, n); System.out.println(base + " elevado a la " + n + " es igual a " + resultado);

Declaramos 2 variables de tipo entero llamadasbase yn. Pedimos al usuario que ingrese la base y el exponente y los almacenamos en las respectivas variables, luego realizamos la operación y finalmente imprimimos el resultado.

Lo que veríamos en la consola sería algo parecido a lo siguiente:

Ingrese la base:
2
Ingrese el exponente
3
2 elevado a la 3 es igual a 8

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Borrar varios campos de texto con un boton en java – Platform – Miami – Colleges – Email

Imaginemos que tenemos un programa en cual ingresamos una cierta cantidad de datos de personas (nombre, cédula, edad, dirección,...), cada dato en un correspondiente campo de texto. Entonces, podría ser útil un botón con el cual con tan solo hacer clic sobre éste, podamos "limpiar" oborrar todos los campos de texto del programa.

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final JButton btnBorrarTodo = new JButton("Borrar todo"); btnBorrarTodo.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { if(arg0.getSource() == btnBorrarTodo){ textField.setText(""); textField_1.setText(""); textField_2.setText(""); textField_3.setText(""); } } }); btnBorrarTodo.setBounds(242, 133, 89, 23); frame.getContentPane().add(btnBorrarTodo);

Cuando se pulse el botón se activará el métodoactionPerformed()el cual colocará todos los campos de texto en blanco con el métodosetText("").

Funcionaría de la siguiente manera:

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