### Question:
Absolute extends Counter { @Override public ValueType<UnsignedLong> delta(Number value) { return this; } Absolute(UnsignedLong value); @Override ValueType<UnsignedLong> delta(Number value); @Override MetricType getType();  }### Answer:
@Test public void test() { Absolute n1 = new Absolute(UnsignedLong.valueOf(5L)); Absolute n2 = new Absolute(UnsignedLong.valueOf(10L)); assertThat(n2.delta(n1).longValue(), is(equalTo(n2.longValue()))); }