Notesale: Turn your study into money

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Java for Beginners
Java is being used in many places these days
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from the Android studio till the backend
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so we are going to
finish it in one video
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we'll start with installation
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the editor that we 'll be using would be Eclipse
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you
will download Eclipse from the website of Eclipse Eclipse
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you can download eclipse for Java
developers as we 've to do Java development
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so my version of Eclipse has switched to its dark mode and I love Dark mode
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you can write your code
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and
below there is the console window in which your output is displayed
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and i 'll name it Javainonevideo
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eclipse ide has been properly installed
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system
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println and you can write anything here
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you store variable in every programming language
and they have different syntax
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Just like in math you assumed x= something, same way here
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how is variable declared
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you can only store underscore —,
underscore and $ sign and alphanumeric characters
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that the user has written this
particular
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Java has specified that you can not use our keyword
while defining the variable
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you can only store the 'true ' and 'false ' value in
the 'boolean'
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There are some operators, that they will allow only these type of
operations
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in Java, the first word of
the variable will start with small letter and the words after that will start in capital letter
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so we made 2 numbers and we added them

to find the sum
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so it summed up these numbers and printed 357
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' means number is incremented or decrement by 1 by 1
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'modulo'
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Object Oriented Programming
Every class has two things properties and behavior
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each
person has some property name and age
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for
example, the first one is walk, second is eat
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p1
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P1, call its 'eat ' function/ method
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the second one that i wrote was p2
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and it has
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now
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Polymorphism is a Greek word made up of 2 words
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and walk is also taking forms once with steps argument and
another without arguments
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Then both will call their respective functions
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because it is being checked at compile time
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and we 'll be understanding their need and implementing them
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According to my experience
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there is collection
framework and collection interface
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collection framework is
huge which includes collection interface in it
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segregation segregate data structures according to their property
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If you ever need to use it
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learnarraylist is basically like normal arrays, just like you make arrays in Java
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here we get a scalable
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array list internally uses array and increases and decreases the size of the
array itself
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When you write this line arraylist = new array list ; then at that time an empty array is created in it
because you have n't added any element till now
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after that as you add 10 elements more in it
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If its size is 'n' it 'll increase its size from 'n ' to 'n+n/2 +1'
and its time to increase the size
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so in this way you can get element of any
index
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if you 're
removing an element from the middle, all the elements after that will shift by one place to the left side
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If it is present in the list
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List is an array list which has a twostring method which is invoked in system
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println
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so you can see that 'the element is ' in this way our entire list is being iterated
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let 's see how you 're able to implement stack and it also comes under list
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this way you can
directly make its object
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After that, if you 've to add an element in it,
the the function is 'push' you can check by peeking, which element is present on top at this time
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you can see lion,, dog,, horse and cat is in the stack
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