java create optional parameters code example
Example 1: java how to make a parameter optional
void foo(String a, Integer b) {
}
void foo(String a) {
foo(a, 0);
}
foo("a", 2);
foo("a");
Example 2: java how to make a parameter optional
void foo(Map<String, Object> parameters) {
String a = "";
Integer b = 0;
if (parameters.containsKey("a")) {
if (!(parameters.get("a") instanceof Integer)) {
throw new IllegalArgumentException("...");
}
a = (Integer)parameters.get("a");
}
if (parameters.containsKey("b")) {
}
}
foo(ImmutableMap.<String, Object>of(
"a", "a",
"b", 2,
"d", "value"));