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Part 10: Working with APIs in JavaScript

  Working with APIs in JavaScript Outline: 1. Introduction to APIs: 1.1 Definition of APIs: Explanation of what an API (Application Programming Interface) is. Understanding the role of APIs in web development. Types of APIs:  RESTful APIs, SOAP APIs, etc. 1.2 Importance of APIs in Web Development: How APIs facilitate communication between different software systems. Use cases of APIs in modern web development. Examples of popular APIs and their impact. 2. Making API Requests: 2.1 HTTP Methods: Overview of common HTTP methods: GET, POST, PUT, DELETE. Explanation of when to use each HTTP method. 2.2 Fetch API: Introduction to the Fetch API in JavaScript. Making simple GET requests with Fetch. Handling responses from Fetch requests. 2.3 Sending Data in API Requests: Using POST requests to send data to the server. Handling different types of data (JSON, form data) in API requests. 3. Handling API Responses: 3.1 Parsing JSON: Importance of JSON (JavaScript Object Notation) in API r...
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Q & A in Java basics Part-2

Q & A in Java basics Part-2

Type casting is done using parentheses and the target type.

20. What is the "super" keyword in Java?

The "super" keyword is used to call a method or access a member from the superclass.

21. How do you implement inheritance in Java?

Inheritance is implemented using the "extends" keyword.

22. Explain the concept of interfaces in Java.

An interface is a reference type like a class but contains only abstract methods and constant fields. Classes can implement multiple interfaces.

23. What is an abstract class in Java?

An abstract class is a class that cannot be instantiated and can contain both abstract and concrete methods. It serves as a base for other classes.

24. How do you achieve multiple inheritance in Java?

Java supports multiple inheritance through interfaces.

25. What is the "default" keyword in interface methods?

The "default" keyword allows defining a method with a default implementation within an interface.

26. How do you handle multi-threading in Java?

You can handle multi-threading using Java's built-in "Thread" class or by implementing the "Runnable" interface.

27. What is synchronization in Java?

Synchronization is used to prevent multiple threads from accessing shared resources simultaneously.

31. What are access modifiers in Java?

Access modifiers control the visibility of classes, methods, and variables. Java has four access modifiers: public, private, protected, and default (package-private).

32. Explain the "final" keyword in Java.

The "final" keyword is used to make a variable, method, or class constant and unchangeable.

28. How do you implement a for loop in Java?

A for loop is used to iterate over a sequence of values.

29. What is a while loop in Java?

A while loop repeatedly executes a block of code as long as the specified condition is true.

30. How do you implement a do-while loop in Java?

A do-while loop executes the code block at least once, and then it repeatedly executes the block if the specified condition is true.

31. What is the "break" statement in Java?

The "break" statement is used to exit a loop or a switch statement prematurely.

32. What is the "continue" statement in Java?

The "continue" statement is used to skip the rest of the loop's body for the current iteration and move to the next iteration.

33. How do you read user input from the console in Java?

You can use the Scanner class from the java.util package to read user input.

Here is the screenshot of output from IntelliJ IDE:

37.What are the different types of control statements in Java?

Java has three types of control statements: selection statements (if-else, switch), loop statements (for, while, do-while), and branching statements (break, continue, return).

39. How do you sort an array in Java?

You can use the Arrays.sort() method to sort an array of primitive data types.

Here is the screenshot of output from IntelliJ IDE:

40. How do you sort an ArrayList in Java?

You can use the Collections.sort() method to sort an ArrayList of objects.

Here is the screenshot of output from IntelliJ IDE:

42. What is autoboxing and unboxing in Java?

Autoboxing is the process of automatically converting a primitive type to its corresponding wrapper class (e.g., int to Integer). Unboxing is the reverse process.

43. What is the "StringBuilder" class in Java, and how is it different from "String" for string manipulation?

The "StringBuilder" class is used for efficient string manipulation, as it allows dynamic modifications to strings without creating new objects. In contrast, the "String" class is immutable, and every modification creates a new string object.

44. How do you find the length of an array in Java?

You can use the "length" property of the array to find its length.

Here is the screenshot of output from IntelliJ IDE:

45. What is the Java Virtual Machine (JVM)?

The JVM is a virtual machine that enables Java bytecode to be executed on any platform. It provides a runtime environment for Java programs.

46. What is the "throws" keyword in Java?

The "throws" keyword is used to declare that a method may throw a specific type of checked exception.

47. What is the "try-with-resources" statement in Java?

The "try-with-resources" statement is used to manage resources that need to be closed explicitly, such as files or network connections. It automatically closes the resources at the end of the block.

48. What is the purpose of the "assert" statement in Java?

The "assert" statement is used to check assumptions during the development phase and can be enabled or disabled at runtime. If an assertion fails, it throws an "AssertionError."

49. How do you convert a string to an integer in Java?

You can use the Integer.parseInt() method to convert a string to an integer.

50. How do you convert an integer to a string in Java?

You can use the String.valueOf() method or simply concatenate the integer with an empty string to convert it to a string.



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