Course Content

  • VectorDemo
  • HashMapDemo

Course Content


HashMap is a data structure that stores key-value pairs. It is useful in many situations where you need to store a large number of items and access them quickly.

HashMap is an object in Java that can be used to store and retrieve data efficiently. It is a collection of key-value pairs, where the keys are arbitrary objects, and the values are arbitrary objects or primitive types.

It implements the Java Map interface in its most basic form. The data is stored in (Key, Value) pairs. To get to a value, you need to know its key. Hashing is a technique used in this class. Hashing is a technique of converting a large String to small String that represents the same String. A shorter value aids indexing and search speed.

It implements the Map interface and inherits the AbstractMap class. The value of a Java HashMap is determined by the key. Only unique keys are stored in the Java HashMap. One null key and numerous null values are possible in a Java HashMap. HashMap in Java is not synchronised. HashMap in Java does not keep track of order.

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