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Questions and Answers
What is a Java interface?
What is a Java interface?
- A keyword in Java used for exception handling
- A built-in graphical user interface component in Java
- A reference type in Java, similar to a class, that can only contain method signatures and constants (correct)
- A type of loop in Java used for iterating over collections
What are the fundamental operations in Java?
What are the fundamental operations in Java?
- Arithmetic, relational, logical, and bitwise operations
- Database operations using SQL queries and JDBC
- Declaration, instantiation, initialization, and usage of variables and objects (correct)
- File input/output operations using streams and readers/writers
What is a Java applet?
What is a Java applet?
- A unit test framework for Java applications
- A small application that is written in Java and delivered to users in the form of bytecode (correct)
- A tool for debugging and profiling Java programs
- A mechanism for implementing multithreading in Java
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Study Notes
Java Interface
- A Java interface is a collection of abstract methods and constants that define a contract that must be implemented by any class that implements it.
- An interface is essentially a blueprint of a class, and it specifies a set of methods that must be implemented by any class that implements it.
- Interfaces are used to achieve abstraction and multiple inheritance in Java.
Fundamental Operations in Java
- The fundamental operations in Java include arithmetic, assignment, comparison, logical, and bitwise operations.
- Arithmetic operations include addition, subtraction, multiplication, and division, as well as modulus and increment/decrement operations.
- Assignment operations include simple assignment, addition assignment, subtraction assignment, and so on.
- Comparison operations include equal, not equal, greater than, less than, and so on.
- Logical operations include AND, OR, and NOT.
- Bitwise operations include AND, OR, and XOR.
Java Applet
- A Java applet is a small Java program that runs on a web browser, typically used to provide interactive features on a web page.
- Applets are compiled into an intermediate form called bytecode, which can be run on any platform that has a Java Virtual Machine (JVM) installed.
- Java applets were widely used in the early days of the web, but have since been largely replaced by other technologies such as JavaScript and HTML5.
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