If condtion not working in blank text field

I want that when the text field is blank it should go to the else if portion of the code below:
JTextField tf1=new JTextField(15);
if (tf1.getText() != null)
JOptionPane.showMessageDialog(tf1, "insert value in the range of a-z,A-Z,0-9");
}                          else if (tf1.getText() == null)
                         System.out.println("fdsafasdfasdfsdf");
System.out.println("1234");
                                                  JOptionPane.showMessageDialog(tf1,"Enter SmartTextID");
but control never goes to ==null,even i have initilaized textField with a text then also when i chk with tf1.getText() == "assigned text", its not working.
plz send me the correct code for this
thanx..

if ( textField.getText().trim().equals("") );

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If condtion not working in blank text field

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