check if map contains key java
if (map.containsKey(key)) {
// Okay, there's a key but the value is null
} else {
// Definitely no such key
}check if map contains key java
if (map.containsKey(key)) {
// Okay, there's a key but the value is null
} else {
// Definitely no such key
}java hashmap key exists
@Test
public void whenKeyIsPresent_thenContainsKeyReturnsTrue() {
Map<String, String> map = Collections.singletonMap("key", "value");
assertTrue(map.containsKey("key"));
assertFalse(map.containsKey("missing"));
}Copyright © 2021 Codeinu
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