[hardwired]

Logic. Consider this:

Code:

public void actionPerformed(ActionEvent ae)
{
    String name, age;
    String location;
    String gender, conduct, gift;

    //rbMale
    if(ae.getSource() == rbMale)
    {
        gender = "Male";
    }

    //rbFemale
    if(ae.getSource() == rbFemale)
    {
        gender = "Female";
    }
    ...
    //bView
    if(ae.getSource() == bView)
    {
        ...
        name = tfName.getText();
        age = tfAge.getText();

        taView.append("Name:"+(" ")+name); 
        taView.append("Age:"+(" ")+age); 
        taView.append("Sex:"+(" ")+gender);
        ...
    }
}

The only way that the String variable "gender" can/will be assigned a value is if ae.getSource() == either "rbMale" or "rbFemale". In any other case, most notably here: "bView", the local variable "gender" has no value assigned to it. The compiler needs to see a value for "gender" before you try to use it.
Solution: give it a value (initialize it) at declaration, eg:

Code:

    String gender = "unknown";