What is a API in Java?

Question

Can anyone explain Java API with an example?

Answer 1

Java API(application package interface) is a collection of predefined classes and packages. These Java APIs are part of java development kits like Android, OpenJDK, and Oracle.

We have to use the import keyword to import the whole package from Java API.

Example

// import whole package

import java.util.*; 

If you want to use a particular class from the package of Java API

Example

// import Vector class from util package

import java.util.Vector;

Here java.util is a package and Vector is a class from util package

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