Initializing Java object instances containing an array of objects

Question

The following code is correct:

public Sample mOboeSamples[] = { new Sample(1,1), new Sample(1,2) };
public Sample mGuitarSamples[] = { new Sample(1,1), new Sample(1,2) };
public SampleSet mSampleSet[] = { 
        new SampleSet( "oboe",  mOboeSamples ),
        new SampleSet( "guitar", mGuitarSamples)
        };

but I'd like to write something like:

public SampleSet mSampleSet[] = { 
        new SampleSet( "oboe",  { new Sample(1,1), new Sample(1,2) } ),
        new SampleSet( "guitar", { new Sample(1,1), new Sample(1,2) } )
        };

This does not compile.

Is there some bit of syntax I'm missing, or is this a language 'feature'?

Similar to this question: stackoverflow.com/questions/2358866/… :) — Chris Dennett
– Chris Dennett, Commented Mar 3, 2010 at 18:10

T.J. Crowder · Accepted Answer · 2010-03-03 18:09:18Z

11

You need to tell it the type of the arrays you're passing as parameters:

public SampleSet mSampleSet[] = { 
    new SampleSet( "oboe",   new Sample[] { new Sample(1,1), new Sample(1,2) } ),
    new SampleSet( "guitar", new Sample[] { new Sample(1,1), new Sample(1,2) } )
};

Without the new expression, the braces aren't valid syntactically (because they're initializers -- in this case -- but you haven't said there's anything there to initialize).

answered Mar 3, 2010 at 18:09

T.J. Crowder

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polygenelubricants · Accepted Answer · 2010-03-03 18:12:27Z

2

Use varargs:

 SampleSet(String name, Sample... samples) {
    // exactly the same code as before should work
 }

Then you can do

 new SampleSet("oboe", new Sample(1, 1), new Sample(1, 2));

answered Mar 3, 2010 at 18:12

polygenelubricants

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