Tutorial Playlist
191 Lessons1. Introduction to Java
2. What is Java?
3. History of Java
4. Java Tutorial for Beginners
5. How Do Java Programs Work?
6. JDK in Java
7. C++ Vs Java
8. Java vs. Python
9. Java vs. JavaScript
10. From Java Source Code to Executable
11. How to Install Java in Linux
12. How to Install Java in Windows 10
13. Java Hello World Program
14. Structure of Java Program and Java Syntax
15. Operators in Java
16. Java If-else
17. Switch Case In Java
18. Loops in Java
19. Infinite loop in Java
20. For Loop in Java
21. For Each Loop in Java
22. Constructor in Java
23. Constructor Overloading in Java
24. Copy Constructor in Java
25. Default Constructor in Java
26. Parameterized Constructors in Java
27. Constructor Chaining In Java
28. Finalize Method in Java
29. Static Method in Java
30. Equals Method in Java
31. Abstract Method in Java
32. toString() Method in Java
33. Difference between equals method in Java
34. Inheritance in Java
35. Multiple Inheritance in Java
36. Hierarchical Inheritance in Java
37. Java Classes and Objects
38. Scanner Class in java
39. All classes in java are inherited from which class
40. What is Nested Class in Java
41. POJO Class in Java
42. Anonymous Class in Java
43. Final Class in Java
44. Object Class in Java
45. Packages in Java
46. Access Modifiers in Java
47. Static Keyword In Java
48. Final Keyword in Java
49. Checked and Unchecked Exceptions in Java
50. User Defined Exception in Java
51. Error vs. Exception in Java
52. Java Collection
53. Collections in Java
54. Garbage Collection in Java
55. Generics In Java
56. Java Interfaces
57. Functional Interface in Java
58. Marker Interface in Java
59. Streams in Java
60. Byte stream in java
61. File Handling in Java
62. Thread in Java
63. Thread Lifecycle In Java
64. Daemon Thread in Java
65. Thread Priority in Java
66. Deadlock in Java
67. String Pool in Java
68. Java Database Connectivity(JDBC)
69. Design Patterns in Java
70. Functional Programming in Java
71. OOP vs Functional vs Procedural
72. Heap Memory and Stack Memory in Java
73. Applet in Java
74. Java Swing
75. Java Frameworks
76. Hibernate Framework
77. JUnit Testing
78. How to Install Eclipse IDE for Java?
79. Command line arguments in Java
80. Jar file in Java
81. Java Clean Code
82. OOPs Concepts in Java
83. Java OOPs Concepts
84. Overloading vs Overriding in Java
85. Java 8 features
86. String in Java
87. String to int in Java
88. Why String Is Immutable in Java?
89. Primitive Data Types in Java
90. Non-Primitive Data Types in Java
91. This and Super Keyword in Java
92. HashMap in Java
93. Comparable And Comparator in Java
94. Type Casting in Java
95. Arrays Sort in Java with Examples
96. Variable Hiding and Variable Shadowing in Java
97. Enum in Java
98. Substring in Java
99. Pattern Programs in Java
100. Hashcode in Java
101. What is ByteCode in Java?
102. How To Take Input From User in Java
103. GCD of Two Numbers in Java
104. Linked List in Java
105. Arithmetic Operators in Java
106. Conditional Operators in Java
107. Stack and Queue in Java
108. Array Length in Java
109. Number Pattern Program in Java
110. Split in java
111. Map In Java
112. Difference Between Throw and Throws in Java
113. Difference Between Data Hiding and Abstraction
114. HashSet in Java
115. String Length in Java
116. Factorial Using Recursion in Java
117. DateFormat in Java
118. StringBuilder Class in java
119. Instance variables in Java
120. Java List Size
121. Java APIs
Now Reading
122. Reverse an Array in Java
123. StringBuffer and StringBuilder Difference in Java
124. Java Program to Add Two Numbers
125. String to Array in Java
126. Regular Expressions in Java
127. Identifiers in Java
128. Data Structures in Java
129. Set in Java
130. Pass By Value and Call By Reference in Java
131. Try Catch in Java
132. Bubble Sort in Java
133. Caesar Cipher Program in Java
134. Queue in Java
135. Object Creation in Java
136. Multidimensional Array in Java
137. How to Read a File in Java
138. String Comparison in Java
139. Volatile Keyword in Java
140. Control Statements in Java
141. Jagged Array in Java
142. Two-Dimensional Array in Java
143. Java String Format
144. Replace in Java
145. charAt() in Java
146. CompareTo in Java
147. Matrix Multiplication in Java
148. Static Variable in Java
149. Event Handling in Java
150. parseInt in Java
151. Java ArrayList forEach
152. Abstraction in Java
153. String Input in Java
154. Logical Operators in Java
155. instanceof in Java
156. Math Floor in Java
157. Selection Sort Java
158. int to char in Java
159. Stringtokenizer in java
160. Implementing and Manipulating Abs in Java
161. Char array to string in java
162. Convert Double To String In Java
163. Deque in Java
164. Converting a List to an Array in Java
165. The Max function in java
166. Removing whitespace from string in java
167. String arrays in Java
168. Strings in Java Vs Strings in Cpp
169. Sum of digits of a number in Java
170. Art of Graphical User Interfaces
171. Trim in Java
172. RxJava
173. Recursion in Java
174. HashSet Java
175. Difference Between Java and Python
176. Square Root in Java
177. Reverse A String in Java
178. Even Odd Program in Java
179. Fibonacci Series in Java
180. Prime Number Program in Java
181. Java Program to Print Prime Numbers in a Given Range
182. Java Leap Year Program
183. Swapping of Two Numbers in Java
184. LCM of Two Numbers in Java
185. Math.sqrt() Function in Java
186. Area of Triangle in Java
187. Sort a String In Java
188. Factorial Program in Java
189. Javafx
190. Lambda expression in java
191. Setup Java Home and IDE on macOS
Java is a versatile and widely-used programming language that has gained immense popularity over the years. One of the key factors contributing to its success is the extensive collection of Java APIs (Application Programming Interfaces). In this Java API tutorial, we will delve into the world of Java API, explore their significance, and provide practical examples to help you harness the power of Java's libraries.
Java is a high-level, object-oriented programming language that was developed by Sun Microsystems (now owned by Oracle Corporation) in the mid-1990s. It is known for its platform independence, robustness, and security features. Java is widely used for developing a variety of applications, including web and mobile applications, enterprise software, and embedded systems.
To develop Java applications, you need the Java Development Kit (JDK), which includes the Java compiler, runtime environment, and other tools necessary for creating and running Java programs.
The JDK also provides a vast array of Java APIs that enable developers to access pre-built functionality and libraries.
Java APIs, or Application Programming Interfaces, are sets of predefined classes, interfaces, and methods that provide ready-made functionality for developers to use in their Java applications.
APIs act as a bridge between different software components, allowing them to interact with each other in a standardized manner. They encapsulate complex operations and provide a simplified interface for developers to work with.
Java APIs are used by a wide range of developers, from beginners to experienced professionals.
They are particularly valuable for Java developers who want to leverage existing functionality rather than reinventing the wheel. By utilizing Java APIs, developers can save time and effort by building upon well-tested and reliable code.
Java APIs serve several important purposes in software development. They promote code reuse, as developers can incorporate existing API functionality into their applications instead of writing everything from scratch.
APIs also abstract away the implementation details of complex operations, providing a higher-level interface that simplifies development.
Additionally, APIs facilitate interoperability between different systems and programming languages, enabling seamless integration and communication.
There are 4 types of APIs in Java and here's a Java API list, explaining each type in the context of web services:
It's important to note that these API types are not mutually exclusive, and an organization may utilize multiple types of APIs based on their specific needs and strategies. Each type serves a different purpose and caters to different audiences, whether it's opening up functionality to the public, collaborating with trusted partners, facilitating internal communication, or aggregating multiple APIs for simplified access.
Data and API services are crucial components in modern software development, enabling applications to interact with data sources and leverage the functionality provided by APIs. Let's explore different aspects related to data and API services:
Internal API services refer to APIs that are designed and used within an organization or enterprise. These APIs are not intended for public use but are utilized internally to facilitate communication and data exchange between different systems, services, or components. Internal API services often enable seamless integration of various internal systems, streamlining business processes, and improving efficiency.
For example, an organization may have an internal API service that allows different departments to exchange data and share information. This could involve APIs for accessing employee databases, managing inventory systems, or retrieving financial data for reporting purposes. Internal API services are crucial for enabling collaboration and ensuring smooth operations within an organization.
External API services are APIs that are exposed by an organization or service provider for external developers or third-party applications to consume. These APIs are made available to the public or selected partners, allowing them to access specific functionalities or data provided by the organization.
For instance, popular social media platforms offer external API services that enable developers to build applications that interact with their platforms. These APIs provide access to features like user authentication, posting updates, retrieving user data, or performing actions on behalf of users. External API services promote integration, expand the reach of services, and encourage innovation by allowing developers to create applications that interact with existing platforms.
CRUD is a common acronym used to describe the basic operations performed on data within a system. It stands for Create, Read, Update, and Delete, representing the fundamental operations that can be performed on data.
CRUD operations are commonly supported by APIs, allowing applications to perform these basic data manipulation tasks. APIs provide a standardized way to interact with data sources and execute CRUD operations programmatically.
User Interface (UI) services encompass APIs or services that focus on managing the user interface aspects of an application. These services provide functionalities for creating, rendering, and managing the user interface elements, such as forms, buttons, menus, and visual components.
UI services are crucial for applications that have a graphical user interface (GUI), allowing developers to define and manipulate the UI elements programmatically. These services often provide features for handling user interactions, managing layouts, and customizing the appearance of the user interface.
Java APIs support various protocols for communication between different systems. Some commonly used protocols include:
Let's explore some of the most commonly used Java APIs and their applications:
1. Java.util: This API provides essential utility classes for working with collections, dates, and other fundamental data structures.
2. Java.io: This API provides classes for performing input and output operations, such as reading from and writing to files, streams, and sockets.
3. Java.net: This API facilitates network programming and provides classes for working with URLs, sockets, and network protocols.
4. Javax.swing: This API is used for building graphical user interfaces (GUIs) in Java applications.
Java APIs offer numerous advantages for developers, such as:
Consider the following example:
import Java.io.File;
import Java.io.IOException;
public class FileOperationsExample {
public static void main(String[] args) {
// Specify the file path
String filePath = "C:/path/to/example.txt";
// Create a File object
File file = new File(filePath);
try {
// Check if the file exists
if (file.exists()) {
System.out.println("File already exists.");
} else {
// Create a new file
boolean created = file.createNewFile();
if (created) {
System.out.println("File created successfully.");
} else {
System.out.println("Failed to create the file.");
}
}
// Get the file name
String fileName = file.getName();
System.out.println("File name: " + fileName);
// Get the file path
String fileAbsolutePath = file.getAbsolutePath();
System.out.println("File absolute path: " + fileAbsolutePath);
// Check if the file is writable
boolean isWritable = file.canWrite();
System.out.println("Is writable: " + isWritable);
// Delete the file
boolean deleted = file.delete();
if (deleted) {
System.out.println("File deleted successfully.");
} else {
System.out.println("Failed to delete the file.");
}
} catch (IOException e) {
System.out.println("An error occurred: " + e.getMessage());
}
}
}
The output of the code will vary depending on the state of the file specified by the filePath variable. Here are the possible outputs for different scenarios:
1. If the file specified by filePath exists:
2. If the file specified by filePath does not exist and is successfully created:
3. If there is an error while creating the file:
4. If there is an error while performing any of the file operations:
Mastering the Java API is essential for Java developers looking to enhance their programming skills and leverage the power of Java's libraries. In this guide, we explored the significance of Java APIs, the types of APIs available, and provided practical examples of commonly used APIs. By harnessing the power of Java APIs, developers can enhance their productivity, improve code quality, and build robust and efficient applications. So dive into the world of Java APIs and unlock the true potential of the Java programming language.
1. What is the purpose of a Java API?
Ans: The purpose of a Java API is to provide a set of pre-built classes, methods, and interfaces that developers can use to enhance their Java applications with additional functionality or interact with external systems.
2. How do I find and explore available Java APIs?
Ans: You can find and explore available Java APIs by referring to official documentation, Java Development Kit (JDK) documentation, online resources, or integrated development environments (IDEs) that provide features for API exploration.
3. How do I handle errors or exceptions when working with Java APIs?
Ans: When working with Java APIs, it is important to handle errors or exceptions that may occur during API usage. This can be done using exception handling mechanisms such as try-catch blocks to catch and handle specific exceptions or using exception propagation for higher-level error handling.
PAVAN VADAPALLI
Director of Engineering
Director of Engineering @ upGrad. Motivated to leverage technology to solve problems. Seasoned leader for startups and fast moving orgs. Working …Read More
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upGrad does not grant credit; credits are granted, accepted or transferred at the sole discretion of the relevant educational institution offering the diploma or degree. We advise you to enquire further regarding the suitability of this program for your academic, professional requirements and job prospects before enr...