Crear una Linea en JAVA Netbens "Plano cartesiano"

Crear una Linea en JAVA Netbens "Plano cartesiano"

CODIGO DEL PROGRAMA

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import java.awt.Graphics;
import javax.swing.JPanel;


public class Linea extends javax.swing.JFrame {
public class Dibujo2D extends JPanel{
public Dibujo2D(){

}
@Override
protected void paintComponent(Graphics g){
int x1,x2, y1, y2;
x1=(int)Double.parseDouble(X1.getText());
y1=(int)Double.parseDouble(Y1.getText());
x2=(int)Double.parseDouble(X2.getText());
y2=(int)Double.parseDouble(Y2.getText());
g.drawLine(x1, y1, x2, y2);
}
}
 

    public Linea() {
        initComponents();
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                       
    private void initComponents() {

        panel11 = new javax.swing.JPanel();
        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        jLabel3 = new javax.swing.JLabel();
        jLabel4 = new javax.swing.JLabel();
        jButton1 = new javax.swing.JButton();
        X1 = new javax.swing.JTextField();
        X2 = new javax.swing.JTextField();
        Y1 = new javax.swing.JTextField();
        Y2 = new javax.swing.JTextField();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        panel11.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(255, 0, 0)));

        javax.swing.GroupLayout panel11Layout = new javax.swing.GroupLayout(panel11);
        panel11.setLayout(panel11Layout);
        panel11Layout.setHorizontalGroup(
            panel11Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 198, Short.MAX_VALUE)
        );
        panel11Layout.setVerticalGroup(
            panel11Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 188, Short.MAX_VALUE)
        );

        jLabel1.setText("x1");

        jLabel2.setText("x2");

        jLabel3.setText("y1");

        jLabel4.setText("y2");

        jButton1.setText("Dibuja");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        X2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                X2ActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(panel11, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(jLabel1)
                            .addComponent(jLabel3))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                            .addComponent(X1, javax.swing.GroupLayout.PREFERRED_SIZE, 59, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(Y1, javax.swing.GroupLayout.PREFERRED_SIZE, 59, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(layout.createSequentialGroup()
                                .addComponent(jLabel4)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                                .addComponent(Y2))
                            .addGroup(layout.createSequentialGroup()
                                .addComponent(jLabel2)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                                .addComponent(X2))))
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addGap(0, 41, Short.MAX_VALUE)
                        .addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 91, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(30, 30, 30)))
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addContainerGap()
                        .addComponent(panel11, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(layout.createSequentialGroup()
                        .addGap(32, 32, 32)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(jLabel1)
                            .addComponent(jLabel2)
                            .addComponent(X1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(X2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addGap(45, 45, 45)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(jLabel3)
                            .addComponent(jLabel4)
                            .addComponent(Y1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(Y2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addGap(41, 41, 41)
                        .addComponent(jButton1)))
                .addContainerGap(29, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>                     

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                       
        dibujar();// TODO add your handling code here:
    }                                     

    private void X2ActionPerformed(java.awt.event.ActionEvent evt) {                                 
        // TODO add your handling code here:
    }                               

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(Linea.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Linea.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Linea.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Linea.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Linea().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify                   
    private javax.swing.JTextField X1;
    private javax.swing.JTextField X2;
    private javax.swing.JTextField Y1;
    private javax.swing.JTextField Y2;
    private javax.swing.JButton jButton1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JPanel panel11;
    // End of variables declaration                 
private void dibujar(){
Linea.Dibujo2D dibuj=new Linea.Dibujo2D() ;
dibuj.setBounds(50,100,1000,1000);
dibuj.setOpaque(false);
panel11.add(dibuj);
panel11.repaint();
}
}

Ecuación de segundo grado

Pedir los coeficientes de una ecuación se 2º grado, y muestre sus soluciones . Si no existen indicarlo.

formulas:

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class JavaApplication1 {




    public static void main(String[] args) throws IOException {
     
        double a2,b2, d,x1 = 0,x2;
     
       System.out.println("Introduzaca primer coheficiente a:");
       System.out.println("Introduzaca primer coheficiente b:");
       System.out.println("Introduzaca primer coheficiente c:");
     
        BufferedReader Entrada = new BufferedReader(new InputStreamReader(System.in));
     
       String a=Entrada.readLine();
        a2=Double.parseDouble(a);
     
        String b=Entrada.readLine();
        b2 = Double.parseDouble(b);
     
        String c=Entrada.readLine();
        double c2 = Double.parseDouble(c);
     
     
       
      // calculamos el determinante
 d=((b2*b2)-4*a2*c2);
 if(d<0)
 System.out.println("No existen soluciones reales");

 else
 // queda confirmar que a sea distinto de 0.
// si a=0 nos encontramos una división por cero.

 x1=(-b2+Math.sqrt(d))/(2*a2);
  x2=(-b2 - Math.sqrt(d))/(2* a2);

    System.out.println(  "Solución: "+ x1);
 System.out.println("Solución: " + x2);


    }
   }
-------------------------------------------------------------------------------------------------------------------
run:
Introduzaca primer coheficiente a:
Introduzaca primer coheficiente b:
Introduzaca primer coheficiente c:
2
5
3
Solución: -1.0
Solución: -1.5
BUILD SUCCESSFUL (total time: 11 seconds)