En Netbeans se crea un JFrame y en modo diseño se añaden los siguientes componentes:
jButtonCalcular
jTextFieldNumeroX
jTextFieldResultado
jLabels varios para identificar tipos de datos que hay que añadir en los jTextFields.
jPanels varios para agrupar y facilitar la inserción de los componentes cuando trabajamos en modo diseño.
Código Java (CantidadPrimos.java):
package primosnum;
public class CantidadPrimos extends javax.swing.JFrame {
public CantidadPrimos() {
initComponents();
this.setLocationRelativeTo(null);
}
private void initComponents() { ... *Código generado automaticamente por NetBeans ... }
private void jButtonCalcularActionPerformed(java.awt.event.ActionEvent evt) {
calcular();
}
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new CantidadPrimos().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButtonCalcular;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JPanel jPanel1;
private javax.swing.JPanel jPanel2;
private javax.swing.JTextField jTextFieldNumeroX;
private javax.swing.JTextField jTextFieldResultado;
// End of variables declaration
private void calcular() {
double x = Double.parseDouble(jTextFieldNumeroX.getText());
double a0 = (2 * x + Math.pow(-1, x) - 1) / 6; //* usar BigInteger¿?
double a1 = Math.ceil(a0) - 1;
double b = (-1 + (Math.sqrt(-2 + 3 * a0))) / 3;
double k = 0, suma = 0;
double numerador, denominador, resultado;
for (int j = 8; j < a1; j++) {
for (int i = 1; i < b; i++) {
numerador = 4 * j - Math.pow(-1, j) + ((2 * i + 1) * Math.pow(-1, i + j)) + ((2 * i - 1) * Math.pow(-1, i)) - (12 * i * i) + 5;
denominador = 12 * i + 6 - (2 * Math.pow(-1, i));
k += funcionEit(numerador / denominador);
}
suma += funcionEit(k);
k = 0;
}
resultado = Math.ceil((2 * x + Math.pow(-1, x) - 6 * suma + 5) / 6);
jTextFieldResultado.setText("" + (int) resultado);
}
private double funcionEit(double x) {
return ((x <= 0) || (x - Math.floor(x) > 0) ? 0 : 1);
}
}
Resultado:
*Código generado automáticamente por NetBeans
private void initComponents() {
jLabel1 = new javax.swing.JLabel();
jPanel1 = new javax.swing.JPanel();
jLabel3 = new javax.swing.JLabel();
jTextFieldResultado = new javax.swing.JTextField();
jLabel2 = new javax.swing.JLabel();
jTextFieldNumeroX = new javax.swing.JTextField();
jPanel2 = new javax.swing.JPanel();
jButtonCalcular = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setResizable(false);
jLabel1.setFont(new java.awt.Font("Barlow Condensed Medium", 1, 36)); // NOI18N
jLabel1.setForeground(new java.awt.Color(0, 0, 204));
jLabel1.setText("Números Primos en X");
jPanel1.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(0, 0, 0)));
jLabel3.setFont(new java.awt.Font("Barlow Condensed Medium", 0, 18)); // NOI18N
jLabel3.setText("Cantidad de primos que contiene X");
jTextFieldResultado.setEditable(false);
jTextFieldResultado.setFont(new java.awt.Font("Barlow Condensed Medium", 0, 36)); // NOI18N
jTextFieldResultado.setHorizontalAlignment(javax.swing.JTextField.CENTER);
jLabel2.setFont(new java.awt.Font("Barlow Condensed Medium", 0, 18)); // NOI18N
jLabel2.setText("Número (x)");
jTextFieldNumeroX.setFont(new java.awt.Font("Barlow Condensed Medium", 0, 36)); // NOI18N
jTextFieldNumeroX.setHorizontalAlignment(javax.swing.JTextField.CENTER);
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jTextFieldNumeroX, javax.swing.GroupLayout.PREFERRED_SIZE, 426, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jTextFieldResultado, javax.swing.GroupLayout.PREFERRED_SIZE, 426, javax.swing.GroupLayout.PREFERRED_SIZE))
.addContainerGap())
);
jPanel1Layout.linkSize(javax.swing.SwingConstants.HORIZONTAL, new java.awt.Component[] {jTextFieldNumeroX, jTextFieldResultado});
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(6, 6, 6)
.addComponent(jLabel2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jTextFieldNumeroX, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel3)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jTextFieldResultado, javax.swing.GroupLayout.PREFERRED_SIZE, 38, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
jPanel1Layout.linkSize(javax.swing.SwingConstants.VERTICAL, new java.awt.Component[] {jTextFieldNumeroX, jTextFieldResultado});
jButtonCalcular.setFont(new java.awt.Font("Barlow Condensed Medium", 0, 18)); // NOI18N
jButtonCalcular.setText("Calcular");
jButtonCalcular.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButtonCalcularActionPerformed(evt);
}
});
javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
jPanel2.setLayout(jPanel2Layout);
jPanel2Layout.setHorizontalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel2Layout.createSequentialGroup()
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButtonCalcular)
.addContainerGap())
);
jPanel2Layout.setVerticalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addContainerGap()
.addComponent(jButtonCalcular)
.addContainerGap())
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jPanel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jLabel1, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap())
);
pack();
}// </editor-fold>
