Preferred way of getting the selected item of a JComboBox

Question

HI   Which is the correct way to get the value from a JComboBox as a String and why is it the correct way  Thanks   String x   JComboBox getSelectedItem   toString      or  String x    String JComboBox getSelectedItem

User · Answer

Note this isn t at heart a question about JComboBox  but about any collection that can include multiple types of objects  The same could be said for  How do I get a String out of a List   or  How do I get a String out of an Object

User · Answer

The first method is right   The second method kills kittens if you attempt to do anything with x after the fact other than Object methods

User · Answer

If you have only put  non-null  String references in the JComboBox  then either way is fine   However  the first solution would also allow for future modifications in which you insert Integers  Doubless  LinkedLists etc  as items in the combo box   To be robust against null values  still without casting  you may consider a third option   String x   String valueOf JComboBox getSelectedItem

User · Answer

String x   JComboBox getSelectedItem   toString      will convert any value weather it is Integer  Double  Long  Short into text on the other hand    String x   String valueOf JComboBox getSelectedItem       will avoid null values  and convert the selected item from object to string

User · Answer

Don t cast unless you must  There s nothign wrong with calling toString

User · Answer

JComboBox mycombo new JComboBox      Creates mycombo JComboBox  add mycombo     Adds it to the jframe   mycombo addItem  Hello Nepal       Adds data to the JComboBox   String s String valueOf mycombo getSelectedItem        Assigns  Hello Nepal  to s   System out println s      Prints  Hello Nepal

[java] Preferred way of getting the selected item of a JComboBox

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