Scprit básico para fazer subtração de horas. Muitas pessoas tem dificuldades em subtrair horas e esse script é bem funcional e com interface gráfica amigável.

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import javax.swing.JOptionPane;


public class JfrmPrincipal extends javax.swing.JFrame {

    public JfrmPrincipal() {
        initComponents();
        setResizable(false);
        setLocationRelativeTo(null);
    }


    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        jTextFieldMin2 = new javax.swing.JTextField();
        jTextFieldHora2 = new javax.swing.JTextField();
        jLabel2 = new javax.swing.JLabel();
        jTextFieldMin1 = new javax.swing.JTextField();
        jTextFieldHora1 = new javax.swing.JTextField();
        jLabel1 = new javax.swing.JLabel();
        jLabel3 = new javax.swing.JLabel();
        jLabel5 = new javax.swing.JLabel();
        jButton1 = new javax.swing.JButton();
        jButton2 = new javax.swing.JButton();
        jButton3 = new javax.swing.JButton();
        jLabel4 = new javax.swing.JLabel();
        jLabel6 = new javax.swing.JLabel();
        resultado = new javax.swing.JTextField();
        jLabel7 = new javax.swing.JLabel();
        jButton4 = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("System Hours");
        setAlwaysOnTop(true);
        setBackground(new java.awt.Color(255, 51, 51));

        jLabel2.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
        jLabel2.setText("Horas Faltas:");

        jTextFieldHora1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jTextFieldHora1ActionPerformed(evt);
            }
        });

        jLabel1.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
        jLabel1.setText("Horas Trabalhadas:");

        jLabel3.setFont(new java.awt.Font("Arial", 1, 14)); // NOI18N
        jLabel3.setText(":");

        jLabel5.setFont(new java.awt.Font("Arial", 1, 28)); // NOI18N
        jLabel5.setForeground(new java.awt.Color(255, 0, 0));
        jLabel5.setText("System Hours");

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

        jButton2.setText("Limpar");
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
            }
        });

        jButton3.setText("Sair");
        jButton3.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton3ActionPerformed(evt);
            }
        });

        jLabel4.setText(":");

        jLabel6.setFont(new java.awt.Font("Arial", 1, 14)); // NOI18N
        jLabel6.setText(":");

        jLabel7.setFont(new java.awt.Font("Arial", 1, 14)); // NOI18N
        jLabel7.setForeground(new java.awt.Color(255, 0, 0));
        jLabel7.setText("Resultado..:");

        jButton4.setForeground(new java.awt.Color(255, 51, 51));
        jButton4.setText("Sobre");
        jButton4.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton4ActionPerformed(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()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(layout.createSequentialGroup()
                                .addGap(111, 111, 111)
                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.CENTER)
                                    .addComponent(jLabel2)
                                    .addComponent(jLabel1))
                                .addGap(45, 45, 45)
                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.CENTER)
                                    .addComponent(jTextFieldHora2, javax.swing.GroupLayout.PREFERRED_SIZE, 40, javax.swing.GroupLayout.PREFERRED_SIZE)
                                    .addComponent(jTextFieldHora1, javax.swing.GroupLayout.PREFERRED_SIZE, 40, javax.swing.GroupLayout.PREFERRED_SIZE))
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.CENTER)
                                    .addComponent(jLabel3)
                                    .addComponent(jLabel6))
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.CENTER)
                                    .addComponent(jTextFieldMin2, javax.swing.GroupLayout.PREFERRED_SIZE, 40, javax.swing.GroupLayout.PREFERRED_SIZE)
                                    .addComponent(jTextFieldMin1, javax.swing.GroupLayout.PREFERRED_SIZE, 40, javax.swing.GroupLayout.PREFERRED_SIZE)))
                            .addGroup(layout.createSequentialGroup()
                                .addGap(96, 96, 96)
                                .addComponent(jLabel5)))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 31, Short.MAX_VALUE))
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addGap(0, 0, Short.MAX_VALUE)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                                    .addGroup(layout.createSequentialGroup()
                                        .addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 100, javax.swing.GroupLayout.PREFERRED_SIZE)
                                        .addGap(10, 10, 10)
                                        .addComponent(jButton2, javax.swing.GroupLayout.PREFERRED_SIZE, 100, javax.swing.GroupLayout.PREFERRED_SIZE)
                                        .addGap(18, 18, 18)
                                        .addComponent(jButton3, javax.swing.GroupLayout.PREFERRED_SIZE, 100, javax.swing.GroupLayout.PREFERRED_SIZE))
                                    .addGroup(layout.createSequentialGroup()
                                        .addComponent(jLabel7)
                                        .addGap(18, 18, 18)
                                        .addComponent(resultado, javax.swing.GroupLayout.PREFERRED_SIZE, 96, javax.swing.GroupLayout.PREFERRED_SIZE)))
                                .addGap(35, 35, 35))
                            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                                .addComponent(jButton4)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)))))
                .addComponent(jLabel4, javax.swing.GroupLayout.PREFERRED_SIZE, 0, javax.swing.GroupLayout.PREFERRED_SIZE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(19, 19, 19)
                .addComponent(jLabel4, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jButton4)
                .addGap(13, 13, 13)
                .addComponent(jLabel5)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 97, Short.MAX_VALUE)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(jLabel1)
                            .addComponent(jTextFieldHora1, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addGap(23, 23, 23)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(jTextFieldHora2, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(jLabel2)))
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jLabel3)
                        .addGap(36, 36, 36)
                        .addComponent(jLabel6))
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jTextFieldMin1, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(23, 23, 23)
                        .addComponent(jTextFieldMin2, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE)))
                .addGap(43, 43, 43)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(resultado, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel7))
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jButton2, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jButton3, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(35, 35, 35))
        );

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

    private void jTextFieldHora1ActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
    }

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {

        try{

        if(((jTextFieldHora1.getText().equals("")) || (jTextFieldHora2.getText().equals(""))) || (jTextFieldHora2.getText().equals("")) || (jTextFieldMin1.getText().equals("")) || (jTextFieldMin2.getText().equals(""))){

                  JOptionPane.showMessageDialog(rootPane, "Campo nao poder ficar em branco!!");

          }
          else {


       int h1 = Integer.parseInt(jTextFieldHora1.getText());
       int h2 = Integer.parseInt(jTextFieldHora2.getText());
       int m1 = Integer.parseInt(jTextFieldMin1.getText());
       int m2 = Integer.parseInt(jTextFieldMin2.getText());
       int rs = 0, rs2 = 0;

       try{

       if((h1<=99) && (h2 <=99) &&(m1 <=60) && (m2 <=60) ){

             if (m1 < m2){
                 h1--;
                 m1= m1 + 60;
                 rs= m1 - m2;
                 rs2 = h1 -h2;

                        if(rs < 10){
                            // JOptionPane.showMessageDialog(rootPane,rs2 +":0"+ rs);
                             resultado.setText((Integer.toString(rs2))+":0"+(Integer.toString(rs)));

                           }
                        else if(rs >9){
                           // JOptionPane.showMessageDialog(rootPane,rs2 +":"+ rs);
                             resultado.setText((Integer.toString(rs2))+":"+(Integer.toString(rs)));

                           }
              }
                else  if ((m1 > m2) || (m1 == m2)){

                     rs= m1 - m2;
                     rs2 = h1 -h2;
                        if(rs < 10){
                            //JOptionPane.showMessageDialog(rootPane,rs2 +":0"+ rs);
                             resultado.setText((Integer.toString(rs2))+":0"+(Integer.toString(rs)));

                            }
                        else if(rs > 9){
                              //  JOptionPane.showMessageDialog(rootPane,rs2 +":"+ rs);
                             resultado.setText((Integer.toString(rs2))+":"+(Integer.toString(rs)));

                            }
                }
            }

       else {
           JOptionPane.showMessageDialog(rootPane, "Hora Invalida!!");
       }
       }catch (Exception ex){
            JOptionPane.showMessageDialog(rootPane, "Erro ao executar programa!!");
       }
        }
        }catch (Exception e ){
          JOptionPane.showMessageDialog(rootPane, "Erro ao executar programa!!"+ e);

        }


    }

    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
      jTextFieldHora1.setText("");
      jTextFieldHora2.setText("");
      jTextFieldMin1.setText("");
      jTextFieldMin2.setText("");
      resultado.setText("");

    }

    private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {
      System.exit(0);

    }

    private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {
        FrmSobre frm = new FrmSobre();
        frm.setVisible(true);
        this.dispose();
    }

    /**
     * @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(JfrmPrincipal.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(JfrmPrincipal.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(JfrmPrincipal.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(JfrmPrincipal.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 JfrmPrincipal().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
    private javax.swing.JButton jButton3;
    private javax.swing.JButton jButton4;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JLabel jLabel5;
    private javax.swing.JLabel jLabel6;
    private javax.swing.JLabel jLabel7;
    private javax.swing.JTextField jTextFieldHora1;
    private javax.swing.JTextField jTextFieldHora2;
    private javax.swing.JTextField jTextFieldMin1;
    private javax.swing.JTextField jTextFieldMin2;
    private javax.swing.JTextField resultado;
    // End of variables declaration
}

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