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Thread: JCombobox Warnings

  1. #1
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    Default 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


  2. #2
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    Default Re: JCombobox 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.

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