jList不返回所需的字符串值

Question

I am new in Java, and I've tried to write a simple GUI application that is supposed to return the selected value of a jList into a textfield .

But instead of the selected text, it returns a memory address like [Ljava.lang.Object;@675b9599 to the textField .

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
    jTextField1.setText(Arsenal.getSelectedValues().toString()); 
} 

Answer 1

Arsenal.getSelectedValues()//Returns Array of Object and Deprecated as well
                   -------

Instead use jList.getSelectedValue() Value Not Values which returns selected element.So it should be

jTextField1.setText((String)Arsenal.getSelectedValue());

If you have added String to your JList you would even don't need to convert it to String as it will return value according to the type of JList element.

If you want to get all selected values use getSelectedValuesList() instead of getSelectedValues() because it's deprecated.

Answer 2

You are probably retrieving the text of the selected element in the JList wrong. You must use the getSelectedValue() to retrieve it.

String text = (String) myList.getSelectedValue();

There is no need to call the toString() method as in myList.getSelectedValue().toString() since that might cause you a NullPointerException if there is no selected value, and the JList instead returns a null` value.

Java docs says:

Returns the value for the smallest selected cell index; the selected value when only a single item is selected in the list. When multiple items are selected, it is simply the value for the smallest selected index. Returns null if there is no selection.

Answer 3

JList only returns the Object .So convert it to the String .

jList.getSelectedValue().toString();

It should work.