Thread: JCombobox Warnings

When I was compiling and running my program yesterday I wasn't receiving any warnings then when I compile and run it today I'm now receiving warnings, can someone help me solve this problem, I have pasted the code and warnings.

    public CarInsuranceCalc()
        { // CarInsuranceCalc method
        super("Car Insurance Price Index Calculator");
 
                // setting layout
        setLayout(new FlowLayout());
 
                // label for gender
                lblGender = new JLabel("Gender:");
                add(lblGender);
 
                // combobox for gender
        cboGender = new JComboBox(Gender);
                cboGender.setSelectedItem(null); // sets default value
        cboGender.addItemListener(
            new ItemListener()
                        {
                public void itemStateChanged(ItemEvent event)
                                {
                                    // sets combobox value equals selected value
                                    if(event.getStateChange()==ItemEvent.SELECTED)
                                    {
                                        // sets variable value to selected value
                                        strGender = String.valueOf(cboGender.getSelectedItem());
                                        if(strGender=="Male" && strAge!=null)
                                        {
                                            dblRate = MaleRate[cboAge.getSelectedIndex()];
                                        }
                                        if(strGender=="Female" && strAge!=null)
                                        {
                                            dblRate = FemaleRate[cboAge.getSelectedIndex()];
                                        }
                                    }
                                } // end of event handler
            }
        ); // end of listener
        add(cboGender);    
 
                // label for age
                lblAge = new JLabel("   Age:");
                add(lblAge);
 
                // combobox for age
         cboAge = new JComboBox(Age);
                cboAge.setSelectedItem(null); // sets default value
        cboAge.addItemListener(
            new ItemListener()
                        {
                public void itemStateChanged(ItemEvent event)
                                {
                                    // sets combobox value equals selected value
                                    if(event.getStateChange()==ItemEvent.SELECTED)
                                    {
                                        // sets variable value to selected value
                                        strAge = String.valueOf(cboAge.getSelectedItem());
                                        if(strGender=="Male")
                                        {
                                            dblRate = MaleRate[cboAge.getSelectedIndex()];
                                        }
                                        if(strGender=="Female")
                                        {
                                            dblRate = FemaleRate[cboAge.getSelectedIndex()];
                                        }
                                    }
                                } // end of event handler
            }
        ); // end of listener
        add(cboAge);
 
                // label for no claims
                lblNoClaim = new JLabel("   No Claims:");
                add(lblNoClaim);
 
                // combobox for no claims
         cboNoClaim = new JComboBox(NoClaim);
                cboNoClaim.setSelectedItem(null); // sets default value
        cboNoClaim.addItemListener(
            new ItemListener()
                        {
                public void itemStateChanged(ItemEvent event)
                                {
                                    // sets combobox value equals selected value
                                    if(event.getStateChange()==ItemEvent.SELECTED);
                                    {
                                        // sets variable value to selected value
                                        strNoClaim = String.valueOf(cboNoClaim.getSelectedItem());
                                        dblNoClaimDiscount = NoClaimDiscount[cboNoClaim.getSelectedIndex()];
                                    }
                                } // end of event handler
            }
        ); // end of listener
        add(cboNoClaim);
 
                btnCalculate = new JButton("Calculate");
                add(btnCalculate);
                HandlerClass handler = new HandlerClass();
                btnCalculate.addActionListener(handler);
 
    } // end of CarInsuranceCalc method

C:\Users\Admin\Desktop\projCarInsuranceCalc\src\pk gCarInsuranceCalc\CarInsuranceCalc.java:50: warning: [unchecked] unchecked call to JComboBox(E[]) as a member of the raw type JComboBox
cboGender = new JComboBox(Gender);
^
where E is a type-variable:
E extends Object declared in class JComboBox
C:\Users\Admin\Desktop\projCarInsuranceCalc\src\pk gCarInsuranceCalc\CarInsuranceCalc.java:81: warning: [unchecked] unchecked call to JComboBox(E[]) as a member of the raw type JComboBox
cboAge = new JComboBox(Age);
^
where E is a type-variable:
E extends Object declared in class JComboBox
C:\Users\Admin\Desktop\projCarInsuranceCalc\src\pk gCarInsuranceCalc\CarInsuranceCalc.java:112: warning: [unchecked] unchecked call to JComboBox(E[]) as a member of the raw type JComboBox
cboNoClaim = new JComboBox(NoClaim);
^
where E is a type-variable:
E extends Object declared in class JComboBox
3 warnings

Either your development environment changed to allow previously suppressed warnings, or the Java version changed so that code that didn't deserve a warning in Java 6 does in Java 7 where the JComboBox became a generic. If your program must compile successfully in both Java 6 (or earlier) and Java 7 environments, then ignore the warnings when in a Java 7 environment and leave JComboBox unparameterized. If you can be sure that you'll be compiling in Java 7 or later, then parameterize it. If you haven't yet learned generics (or don't want to), then the choice is made for you.