java不同类之间引用问题

Question

例如
class a{     public void excute() {
     new b();
}
private void jTextField1ActionPerformed(java.awt.event.ActionEvent evt) {}
private void jTextField2ActionPerformed(java.awt.event.ActionEvent evt) {}
public String test1()
    {
        
        String velocity = jTextField1.getText();
        return  velocity;
    }
     public String test2()
    {
        String pressure = jTextField2.getText();
        return  pressure;
    }}
------------------------------------------------------------------------------------------
class b{
    String v_set=new a().test1();
    String p_set=new a().test2();
    public void main ()
    { 
        System.out.println(v_set+p_set);
    }
}
----------------------------------------------------------------------------------------------
请问为什么b类中的v_set和p_set取不到jtextfield中输入的值？

Answer 1

补充说明一下class a是个jframe，可以输入参数，class b 是一个需要执行的对象，里面会用到jframe里输入的参数，求大神指点这样的该怎么处理

Answer 2

public class mypanel extends javax.swing.JFrame {    /**
     * Creates new form mypanel
     */
        public mypanel() {
        initComponents();
        this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        this.setVisible(true);
    }    /**
     * 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() {        jTextField1 = new javax.swing.JTextField();
        jButton1 = new javax.swing.JButton();
        jButton2 = new javax.swing.JButton();     
        jButton3 = new javax.swing.JButton();
        jTextField2 = new javax.swing.JTextField();
        jTextField3 = new javax.swing.JTextField();        jTextField1.setText("jTextField1");        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);        jButton1.setText("bc setting");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });        jButton2.setText("physical_setting");
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
            }
        });       
        jButton3.setText("set_velocity&pressure");
        jButton3.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton3ActionPerformed(evt);
            }
        });            jTextField2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jTextField2ActionPerformed(evt);
            }
        });        jTextField3.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jTextField3ActionPerformed(evt);
            }
        });       .....
    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
        final MacroExecuteAction mea = SystemAction.get(MacroExecuteAction.class);
        mea.setMacro(new boundary_setting());
        mea.performAction();
      
    }                                            private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
        final MacroExecuteAction mea = SystemAction.get(MacroExecuteAction.class);
        mea.setMacro(new physical_setting());
        mea.performAction();
    }                                            private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
        final MacroExecuteAction mea = SystemAction.get(MacroExecuteAction.class);
        mea.setMacro(new set_velocity_pressure());
        mea.performAction();       
    }                                        
 
    private void jTextField2ActionPerformed(java.awt.event.ActionEvent evt) {                                            
        // TODO add your handling code here:
         
    }                                               private void jTextField3ActionPerformed(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(mypanel.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(mypanel.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(mypanel.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(mypanel.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 mypanel().setVisible(true);
            }
        });
    }
        
    public String test1()
    {
        
        String velocity = jTextField2.getText();
        return  velocity;
    }
     public String test2()
    {
        String pressure = jTextField3.getText();
        return  pressure;
    }
           
    }
------------------------------------------------
这个是jframe的UI，我所有的输入和执行都在这个上面，输入使用了jtextfield,执行是jbutton.
------------------------------------------------public class set_velocity_pressure extends StarMacro {
      
    String velocity=new mypanel().test1();
    double v=Double.valueOf(velocity).doubleValue(); 
    String pressure=new mypanel().test2();
    double p=Double.valueOf(pressure).doubleValue();
       
    public void execute() {
        Simulation sim = this.getActiveSimulation();
        sim.println("settings are completed.");
        execute0();
  }
   
  private void execute0() {    Simulation simulation_0 = 
      getActiveSimulation();    Region region_0 = 
      simulation_0.getRegionManager().getRegion("fill pipe");    Boundary boundary_0 = 
      region_0.getBoundaryManager().getBoundary("inlet");    MassFlowRateProfile massFlowRateProfile_0 = 
      boundary_0.getValues().get(MassFlowRateProfile.class);    massFlowRateProfile_0.getMethod(ConstantScalarProfileMethod.class).getQuantity().setValue(v);    Boundary boundary_1 = 
      region_0.getBoundaryManager().getBoundary("outlet");    StaticPressureProfile staticPressureProfile_0 = 
      boundary_1.getValues().get(StaticPressureProfile.class);    staticPressureProfile_0.getMethod(ConstantScalarProfileMethod.class).getQuantity().setValue(p);
  }
}
---------------------------------------------------------------
这个类是jbutton3所执行的内容，完成设定速度和压力。
问题出在标红的这一行 ，无法获取jtext的输入值。

Answer 3

求大神帮忙，对JAVA不熟

Answer 4

那么长。。还不排一点诚意都没有你的main方法为毛是 public void main ()

Answer 5

如果是main方法应该是酱紫的把public static void main(String[] args)

Answer 6

额，对JAVA不熟，不是学这个的。我是想搞机械设计的，想做个二次开发，但是对编程懂的不多。

Answer 7

额，对JAVA不熟，不是学这个的。我是想搞机械设计的，想做个二次开发，但是对编程懂的不多。

Answer 8

你的main方法为毛是 public void main ()额，对JAVA不熟，不是学这个的。我是想搞机械设计的，想做个二次开发，但是对编程懂的不多。