ocs/api/java.base/java/util/AbstractMap.html#containsKey(java.lang.Object)" title="class or interface in java.util" class="external-link">containsKey</a></code>&nbsp;in class&nbsp;<code><a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/AbstractMap.html" title="class or interface in java.util" class="external-link">AbstractMap</a>&lt;<a href="https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="externa