data.addRow( new Object[] { "a", new Integer( 1 ) } );
data.addRow( new Object[] { "b", new Integer( 2 ) } );
data.addRow( new Object[] { "c", new Integer( 3 ) } );
Object[] row = data.peek();
assertEquals( "a", row[0] );
assertEquals( 1, row[1] );
row = data.peek();
assertEquals( "a", row[0] );