From the course: Advanced Java Programming
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Storing pairs with HashMaps - Java Tutorial
From the course: Advanced Java Programming
Storing pairs with HashMaps
- [Instructor] Hashmaps are a common data structure used in Java programing. They allow you to store pairs of values together. One example use for a hashmap is a phone book. I could create a hashmap where the name of the contacts was the key, and the phone number was the value. To do this, in my main method in the hashmap example class I will create a hashmap variable. Inside the angle brackets after hashmap, I will specify that the key should be of type string and the value should be of type integer. (keyboard clicks) I will call the variable phone book. (keyboard clicks) And I will assign it to a new instance of hashmap. (keyboard clicks) To add values to the hashmap, I'll use the put method. For example, I can do phonebook.put and parse in Kevin as the key, and then parse in an integer such as 12345 as the phone number. (keyboard clicks) I can then add as many values as I like. I will add a contact called Jill who's number is 98765, (keyboard clicks) and a contact called Brenda…
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