Java Programming Lecture 1

What is the output of the following code snippet: int a = 60; int b = 90; boolean c; c = a > b; System.out.println(c);

What is the purpose of the ! operator in a conditional statement?

What is the output of the following code snippet: int a = 60; int b = 90; boolean c; c = a > 50 && b >= 90; System.out.println(c);

What is the purpose of the || operator in a conditional statement?

What is the output of the following code snippet: int a = 60; int b = 90; int max = (a>b)?a:b; System.out.println(max);

What is the purpose of the if-else statement in programming?

What is the output of the following code snippet: int a = 60; int b = 90; if(a>b) { System.out.println("a is greater than b"); } else { System.out.println("a is not greater than b"); }

What is the purpose of the switch statement in programming?

What is the output of the following code snippet: int a = 60; int b = 90; if(a>b) { System.out.println("a is greater than b"); } else if(a==b) { System.out.println("a is equal to b"); } else { System.out.println("a is not greater than b"); }

What is the purpose of the conditional operator (? :) in programming?

Introduction to Java

Java is an object-oriented language
A Java program consists of classes only
There is no way to define standalone functions
Java is a multi-platform language (Windows, Linux, Unix, Mac OS, Android)
Java is non-native, means it does not produce executable files like C/C++
Java produces .class files that require Java Virtual Machine (JVM) to run

Java Hello Program

A simple Java program uses public class and public static void main methods
The main method is the entry point of the program
The System.out.println method is used to print output to the console

Variables, Data Types, and Operators

Java has two types of data types: primitive and reference
Primitive data types include byte, short, int, long, float, double, boolean, char
Variables are declared using the type variable_name syntax
Operators include arithmetic, relational, logical, assignment, and conditional operators

Control Flow Statements

Conditional statements: if, if-else, switch
Loops: while, for, do-while
Conditional expressions: ?: operator

Methods and Functions

Methods are blocks of code that can be called multiple times from different parts of the program
Methods can take arguments and return values
Methods can be overloaded and overridden

Input and Output

System.in and System.out are used for input and output operations
Scanner class is used to read input from the user
printf and format methods are used to format output

Packages and Importing

Java has a concept of packages, which are used to group related classes and interfaces
import statement is used to import classes and interfaces from packages
java.util package provides various utility classes, including Scanner and Random

Math and Formatting

Math class provides mathematical constants and functions
DecimalFormat class is used to format numerical values
NumberFormat class is used to format numbers and currencies

Introduction to Java programming basics, covering topics such as Java syntax, packages, conditions, and loops. Learn how to write your first Java program with this lecture.

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Java Programming Lecture 1

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Questions and Answers

What is the output of the following code snippet: `int a = 60; int b = 90; boolean c; c = a > b; System.out.println(c);`

What is the purpose of the `!` operator in a conditional statement?

What is the output of the following code snippet: `int a = 60; int b = 90; boolean c; c = a > 50 && b >= 90; System.out.println(c);`

What is the purpose of the `||` operator in a conditional statement?

What is the output of the following code snippet: `int a = 60; int b = 90; int max = (a>b)?a:b; System.out.println(max);`

What is the purpose of the `if-else` statement in programming?

What is the output of the following code snippet: `int a = 60; int b = 90; if(a>b) { System.out.println("a is greater than b"); } else { System.out.println("a is not greater than b"); }`

What is the purpose of the `switch` statement in programming?

What is the output of the following code snippet: `int a = 60; int b = 90; if(a>b) { System.out.println("a is greater than b"); } else if(a==b) { System.out.println("a is equal to b"); } else { System.out.println("a is not greater than b"); }`

What is the purpose of the conditional operator (`? :`) in programming?