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Core JAVA
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‎.gitignore‎

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#.idea/
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#IdeaProjects.iml
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out/

‎.idea/.gitignore‎

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‎.idea/misc.xml‎

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‎.idea/modules.xml‎

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‎.idea/vcs.xml‎

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‎Core JAVA.md‎

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# Core JAVA
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```java
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class test{
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public static void main(string[] args){
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int x = 10;
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// System.out.println("Hello");
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}
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}
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```
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## How many identifiers are their?
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- Test
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- main
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- string
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- args
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- x
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---
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## valid identifiers
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- ✅ total_numbers
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- ❌ total#
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- ❌ 123total
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- ✅ total123
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- ✅ ca$h
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- ✅ `_$_$_$_$_`
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- ❌ all@hands
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- ✅ Java2Share
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- ✅ Integer
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- ✅ Int
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- ❌ int
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---
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### **Java Reserved Words (53)**
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**1. Keywords (50)**
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* **Used Keywords (48)**
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* Examples:
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```
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if, else, for, while, class, interface, static, public, private, protected, return, void, new, try, catch, finally, throw, throws, switch, case, break, continue, default, do, enum, extends, implements, import, package, synchronized, volatile, transient, abstract, final, native, strictfp, this, super, assert, byte, short, int, long, float, double, char, boolean
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```
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* **Unused Keywords (2)**
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* `goto`
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* `const`
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**2. Reserved Literals (3)**
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* `true`
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* `false`
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* `null`
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---
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```java
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Reserved Words (53)
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│
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├── Keywords (50)
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│ │
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│ ├── Used Keywords (48)
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│ │ ├── if
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│ │ ├── else
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│ │ ├── for
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│ │ ├── while
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│ │ └── ... (other 44 keywords)
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│ │
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│ └── Unused Keywords (2)
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│ ├── goto
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│ └── const
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│
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└── Reserved Literals (3)
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├── true
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├── false
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└── null
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```
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---
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### **Java Reserved Words (53)**
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```java
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Reserved Words (53)
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│
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├── Keywords (50)
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│ │
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│ ├── Data Types (8) ✅
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│ │ ├── byte
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│ │ ├── short
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│ │ ├── int
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│ │ ├── long
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│ │ ├── float
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│ │ ├── double
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│ │ ├── boolean
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│ │ └── char
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│ │
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│ ├── Flow Control (11) ✅
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│ │ ├── if
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│ │ ├── else
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│ │ ├── switch
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│ │ ├── case
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│ │ ├── default
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│ │ ├── while
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│ │ ├── do
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│ │ ├── for
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│ │ ├── break
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│ │ ├── continue
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│ │ └── return
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│ │
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│ ├── Modifiers (11) ✅
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│ │ ├── public
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│ │ ├── private
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│ │ ├── protected
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│ │ ├── static
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│ │ ├── final
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│ │ ├── abstract
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│ │ ├── synchronized
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│ │ ├── native
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│ │ ├── strictfp (added in Java 1.2)
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│ │ ├── transient
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│ │ └── volatile
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│ │
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│ ├── Exception Handling (6) ✅
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│ │ ├── try
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│ │ ├── catch
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│ │ ├── finally
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│ │ ├── throw
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│ │ ├── throws
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│ │ └── assert (added in Java 1.4)
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│ │
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│ ├── Class Related (6) ✅
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│ │ ├── class
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│ │ ├── interface
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│ │ ├── extends
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│ │ ├── implements
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│ │ ├── package
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│ │ └── import
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│ │
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│ ├── Object Related (4) ✅
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│ │ ├── new
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│ │ ├── instanceof
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│ │ ├── super
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│ │ └── this
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│ │
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│ └── Unused Keywords (2)
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│ ├── goto
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│ └── const
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│
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└── Reserved Literals (3)
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├── true
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├── false
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└── null
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```
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---
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‎IdeaProjects.iml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<module type="JAVA_MODULE" version="4">
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<component name="NewModuleRootManager" inherit-compiler-output="true">
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<exclude-output />
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<content url="file://$MODULE_DIR$">
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<sourceFolder url="file://$MODULE_DIR$" isTestSource="false" packagePrefix="com.akashdipmahapatra" />
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</content>
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<orderEntry type="inheritedJdk" />
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<orderEntry type="sourceFolder" forTests="false" />
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</component>
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</module>

‎Practice/Q1.java‎

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‎Practice/Q1_DaysInMonth.java‎

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package com.akashdipmahapatra.Practice;
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import java.util.Scanner;
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public class Q1_DaysInMonth {
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public static void main(String[] args) {
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Scanner sc = new Scanner(System.in);
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System.out.print("Enter date (dd-mm-yyyy): ");
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String input = sc.nextLine();
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String[] parts = input.split("-");
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int day = Integer.parseInt(parts[0]);
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int month = Integer.parseInt(parts[1]);
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int year = Integer.parseInt(parts[2]);
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int daysInMonth;
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if (month == 2)
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daysInMonth = 28;
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else if (month == 4 || month == 6 || month == 9 || month == 11)
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daysInMonth = 30;
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else
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daysInMonth = 31;
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System.out.println("Output: " + daysInMonth);
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}
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}

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