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Boolean vs boolean as method parameter

Posted on 2012-03-26
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Last Modified: 2012-03-26
For a method that has a Boolean parameter, as opposed to boolean, is it acceptable to use true or false?

For example, AbstractRenderer.setSeriesVisibleInLegend(Boolean visible):
renderer.setSeriesVisibleInLegend(false);

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or would it make a difference in doing:
renderer.setSeriesVisibleInLegend(new Boolean(false));

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Question by:allelopath
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for_yan earned 500 total points
ID: 37768285
It will make no difference - if compiler accepts just. "True" or "false" it means it is doing autoboxing - so it would be fine; if it does not accept. Then you haveto use new Boolean(truie)
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Expert Comment

by:for_yan
ID: 37768333
Yes, it works and compiler doe not complain so it isOK to use true and false in this case:

  public static void takeBoolean(Boolean b){
       
       
    }
   
    public static void main(String[] args) {
       
       
        takeBoolean(true);

}
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Expert Comment

by:for_yan
ID: 37768349
You see how it works:

public class TestBoolean {
  public static void takeBoolean(Boolean b){

        System.out.println("Class of b:" + b.getClass());

         System.out.println("Vlaue  of b:" + b.booleanValue());


    }

    public static void main(String[] args) {


        takeBoolean(true);

}

}
        

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Output:

Class of b:class java.lang.Boolean
Vlaue  of b:true

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Expert Comment

by:for_yan
ID: 37768355
I think it will work only after Java 5 or 6 - when they introduced autoboxing which deals with those types like Integer, Boolean , Double...
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Expert Comment

by:for_yan
ID: 37768366
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Expert Comment

by:for_yan
ID: 37768387
The only difference would be if there is overloading
See an example
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Expert Comment

by:for_yan
ID: 37768399
here we defined two methdos which differe that one tkaes boolean and anothe takse Boolean,
then in thios case it will take the method wchich uses Boolean:


public class testBooolean {

     public static void takeBoolean(boolean b){
                     System.out.println("I type here something else");
     }



    public static void takeBoolean(Boolean b){

        System.out.println("Class of b:" + b.getClass());

         System.out.println("Vlaue  of b:" + b.booleanValue());


    }

    public static void main(String[] args) {


        takeBoolean(new Boolean(true));


}
 
}       

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Output:

Class of b:class java.lang.Boolean
Vlaue  of b:true

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0
 
LVL 47

Expert Comment

by:for_yan
ID: 37768415
however in this case:
it wil use method which has argiment of boolean:
(unless you have tw exactly identical methods which only differe by Bollean vs boolens - then you do not care. This is just exotic example

public class TestBoolean{
  public static void takeBoolean(boolean b){
                     System.out.println("I type here something else");
     }



    public static void takeBoolean(Boolean b){

        System.out.println("Class of b:" + b.getClass());

         System.out.println("Vlaue  of b:" + b.booleanValue());


    }

    public static void main(String[] args) {


        takeBoolean(true);
        

}
}

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Output

I type here something else

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0

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