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compile error:  incompatable types___found: void___required: java.lang.String

Posted on 2004-09-17
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Last Modified: 2012-05-05
The Situation:
New Java coder.
Writing a class where user inputs weight in pounds or kilos then converts to pounds or kilos.

The Code:
public void set()
{
     //input and report units
     //loop till k or p is entered
     do
     {
          x = JOptionPane.showMessageDialog (null, "Is the weight measured in Kilograms (input K) or Pounds (input P)?");
          unitReply = x.charAt(0);

The Compile error:
incompatible types
found   : void
required: java.lang.String
x = JOptionPane.showMessageDialog (null, "Is the weight measured in
                                                      ^
Kilograms (input K) or Pounds (input P)?");

What is the problem?

smkJackstraw
                                                         
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Question by:smkJackstraw
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3 Comments
 
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Accepted Solution

by:
CI-Ia0s earned 50 total points
ID: 12089700
showMessageDialog doesn't return anything, ie. void. You want showInputDialog.
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LVL 3

Expert Comment

by:CI-Ia0s
ID: 12089703
Also, with showInputDialog it would be:
x = JOptionPane.showInputDialog("Is the weight measured in Kilograms (input K) or Pounds (input P)?");

No "null" with showInputDialog.
0
 
LVL 3

Expert Comment

by:CI-Ia0s
ID: 12089739
P.S. A note of caution to a new programmer: choosing variables with names such as "x" will come back to haunt you later on. When you get to writing programs with dozens or even hundreds of variables you'll start forgetting which are which. It's better to have a more informative variable name, such as "weightUnit", etc.
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