how to have optional parameter in java code example
Example 1: java how to make a parameter optional
void foo(String a, Optional<Integer> bOpt) {
Integer b = bOpt.isPresent() ? bOpt.get() : 0;
}
foo("a", Optional.of(2));
foo("a", Optional.<Integer>absent());
Example 2: java how to make a parameter optional
void foo(String a, Integer... b) {
Integer b1 = b.length > 0 ? b[0] : 0;
Integer b2 = b.length > 1 ? b[1] : 0;
}
foo("a");
foo("a", 1, 2);
Example 3: java how to make a parameter optional
void foo(String a, Integer b, Integer c) {
b = b != null ? b : 0;
c = c != null ? c : 0;
}
foo("a", null, 2);