public static void main(String[] args) {
// Generics, varargs & boxing working together:
List<Integer> li = Arrays.asList(1, 2, 3, 4, 5, 6, 7);
Integer result = reduce(li, new IntegerAdder());
print(result);
result = reduce(li, new IntegerSubtracter());
print(result);
print(filter(li, new GreaterThan<Integer>(4)));
print(forEach(li, new MultiplyingIntegerCollector()).result());
print(
forEach(filter(li, new GreaterThan<Integer>(4)), new MultiplyingIntegerCollector())
.result());
MathContext mc = new MathContext(7);
List<BigDecimal> lbd =
Arrays.asList(
new BigDecimal(1.1, mc),
new BigDecimal(2.2, mc),
new BigDecimal(3.3, mc),
new BigDecimal(4.4, mc));
BigDecimal rbd = reduce(lbd, new BigDecimalAdder());
print(rbd);
print(filter(lbd, new GreaterThan<BigDecimal>(new BigDecimal(3))));
// Use the prime-generation facility of BigInteger:
List<BigInteger> lbi = new ArrayList<BigInteger>();
BigInteger bi = BigInteger.valueOf(11);
for (int i = 0; i < 11; i++) {
lbi.add(bi);
bi = bi.nextProbablePrime();
}
print(lbi);
BigInteger rbi = reduce(lbi, new BigIntegerAdder());
print(rbi);
// The sum of this list of primes is also prime:
print(rbi.isProbablePrime(5));
List<AtomicLong> lal =
Arrays.asList(
new AtomicLong(11), new AtomicLong(47), new AtomicLong(74), new AtomicLong(133));
AtomicLong ral = reduce(lal, new AtomicLongAdder());
print(ral);
print(transform(lbd, new BigDecimalUlp()));
}
public BigInteger combine(BigInteger x, BigInteger y) {
return x.add(y);
}