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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?
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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);
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What is the purpose of the if-else statement in programming?
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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"); }
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What is the purpose of the switch statement in programming?
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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"); }
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What is the purpose of the conditional operator (? :) in programming?
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Study Notes
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 classandpublic static void mainmethods - The
mainmethod is the entry point of the program - The
System.out.printlnmethod 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
typevariable_namesyntax - 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.inandSystem.outare used for input and output operations -
Scannerclass is used to read input from the user -
printfandformatmethods are used to format output
Packages and Importing
- Java has a concept of packages, which are used to group related classes and interfaces
-
importstatement is used to import classes and interfaces from packages -
java.utilpackage provides various utility classes, includingScannerandRandom
Math and Formatting
-
Mathclass provides mathematical constants and functions -
DecimalFormatclass is used to format numerical values -
NumberFormatclass is used to format numbers and currencies
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Description
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.
