public int[] getAdvanceWidth() 
{
        return advanceWidth;
}

 public  void initData(TrueTypeFont ttf,
    TTFDataStream data) throws IOException 
{
        HorizontalHeaderTable hHeader = ttf.getHorizontalHeader();
        MaximumProfileTable maxp = ttf.getMaximumProfile();
        int numHMetrics = hHeader.getNumberOfHMetrics();
        int numGlyphs = maxp.getNumGlyphs();
        advanceWidth = new int[ numHMetrics ];
        leftSideBearing = new short[ numHMetrics ];
        for( int i=0; i< numHMetrics; i++ )
        {
            advanceWidth[i] = data.readUnsignedShort();
            leftSideBearing[i] = data.readSignedShort();
        }
        int numberNonHorizontal = numGlyphs - numHMetrics;
        nonHorizontalLeftSideBearing = new short[ numberNonHorizontal ];
        for( int i=0; i< numberNonHorizontal; i++ )
        {
            nonHorizontalLeftSideBearing[i] = data.readSignedShort();
        }
}

This will read the required data from the stream.

 public  void setAdvanceWidth(int[] advanceWidthValue) 
{
        this.advanceWidth = advanceWidthValue;
}