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OOP 1 | Introduction & Concepts - Classes, Objects, Constructors, Keywords :check
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‎A03__conditionals_loops/assignments/Basic/Program_22.java

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‎A09__patterns/assignments/README.md

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# Pattern Questions
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Print these patterns using loops:
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```text
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1. *****
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*****
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*****
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*****
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*****
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2. *
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**
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***
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****
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*****
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3. *****
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****
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***
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**
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*
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4. 1
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1 2
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1 2 3
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1 2 3 4
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1 2 3 4 5
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5. *
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**
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***
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****
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*****
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****
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***
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**
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*
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6. *
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**
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***
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****
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*****
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7. *****
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****
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***
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**
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*
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8. *
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***
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*****
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*******
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*********
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9. *********
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*******
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*****
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***
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*
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10. *
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* *
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* * *
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* * * *
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* * * * *
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11. * * * * *
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* * * *
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* * *
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* *
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*
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12. * * * * *
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* * * *
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* * *
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* *
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*
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*
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* *
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* * *
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* * * *
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* * * * *
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13. *
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* *
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* *
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* *
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*********
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14. *********
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* *
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* *
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* *
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*
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15. *
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* *
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* *
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* *
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* *
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* *
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* *
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* *
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*
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16. 1
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1 1
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1 2 1
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1 3 3 1
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1 4 6 4 1
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17. 1
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212
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32123
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4321234
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32123
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212
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1
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18. **********
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**** ****
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*** ***
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** **
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* *
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* *
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** **
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*** ***
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**** ****
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**********
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19. * *
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** **
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*** ***
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**** ****
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**********
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**** ****
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*** ***
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** **
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* *
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20. ****
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* *
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* *
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* *
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****
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21. 1
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2 3
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4 5 6
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7 8 9 10
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11 12 13 14 15
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22. 1
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0 1
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1 0 1
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0 1 0 1
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1 0 1 0 1
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23. * *
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* * * *
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* * *
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24. * *
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** **
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* * * *
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* * * *
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* ** *
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* ** *
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* * * *
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* * * *
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** **
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* *
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25. *****
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* *
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* *
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* *
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*****
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26. 1 1 1 1 1 1
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2 2 2 2 2
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3 3 3 3
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4 4 4
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5 5
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6
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27. 1 2 3 4 17 18 19 20
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5 6 7 14 15 16
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8 9 12 13
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10 11
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28. *
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* *
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* * *
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* * * *
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* * * * *
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* * * *
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* * *
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* *
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*
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29.
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* *
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** **
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*** ***
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**** ****
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**********
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**** ****
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*** ***
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** **
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* *
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30. 1
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2 1 2
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3 2 1 2 3
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4 3 2 1 2 3 4
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5 4 3 2 1 2 3 4 5
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31. 4 4 4 4 4 4 4
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4 3 3 3 3 3 4
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4 3 2 2 2 3 4
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4 3 2 1 2 3 4
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4 3 2 2 2 3 4
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4 3 3 3 3 3 4
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4 4 4 4 4 4 4
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32. E
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D E
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C D E
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B C D E
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A B C D E
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33. a
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B c
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D e F
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g H i J
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k L m N o
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34. E D C B A
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D C B A
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C B A
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B A
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A
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35. 1 1
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12 21
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123 321
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12344321
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```

‎A14__oops/assignments/README.md

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# Important Topics
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- [Kunal's notes](https://github.com/kunal-kushwaha/DSA-Bootcamp-Java/tree/main/lectures/17-oop/notes)
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- [Object Oriented Paradigms](https://www.geeksforgeeks.org/object-oriented-programming-oops-concept-in-java/) `GFG`
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- [Constructors in Java](https://www.geeksforgeeks.org/constructors-in-java/) `GFG`
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- [Constructor chaining in Java](https://www.geeksforgeeks.org/constructor-chaining-java-examples/) `GFG`
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- [Inheritance in Java](https://www.geeksforgeeks.org/inheritance-in-java/) `GFG`
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- [Overriding in Java](https://www.geeksforgeeks.org/overriding-in-java/) `GFG`
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- [Abstraction in Java](https://www.geeksforgeeks.org/abstraction-in-java-2/) `GFG`
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- [Access modifiers in Java](https://www.geeksforgeeks.org/access-modifiers-java/) `GFG`
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- [Wrapper Classes in Java](https://www.geeksforgeeks.org/wrapper-classes-java/) `GFG`
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- [Need of wrapper classes in Java](https://www.geeksforgeeks.org/need-of-wrapper-classes-in-java/) `GFG`
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- [this keyowrd in Java](https://www.javatpoint.com/this-keyword) `Javatpoint`
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- [Important keyowrds in Java inheritance - extends,implements,super,instanceof](https://www.tutorialspoint.com/java/java_inheritance.htm)
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`Tutorialspoint`
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- [Instance initializer block](https://www.javatpoint.com/instance-initializer-block) `Javatpoint`
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- [Dynamic Method Dispatch or Runtime Polymorphism in Java](https://www.geeksforgeeks.org/dynamic-method-dispatch-runtime-polymorphism-java/)
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`GFG`
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- [Cohesion in Java](https://www.geeksforgeeks.org/cohesion-in-java/) `GFG`
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- [Coupling in Java](https://www.geeksforgeeks.org/coupling-in-java/) `GFG`
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# Interview Questions
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- [Can we declare main() method as private or protected or with no access modifier in java?](https://www.tutorialspoint.com/can-we-declare-main-method-as-private-or-protected-or-with-no-access-modifier-in-java)
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`Tutorialspoint`
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- [Difference between Method Overloading and Method Overriding in Java?](https://www.geeksforgeeks.org/difference-between-method-overloading-and-method-overriding-in-java/)
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`GFG`
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- [Can we declare interface members as private or protected in java8?](https://www.tutorialspoint.com/can-we-declare-interface-members-as-private-or-protected-in-java8)
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`Tutorialspoint`
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- [Can we override a private or static method in Java?](https://www.tutorialspoint.com/can-we-override-a-private-or-static-method-in-java)
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`Tutorialspoint`
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- [What is diamond problem in Java?](https://www.javatpoint.com/what-is-diamond-problem-in-java) `Javatpoint`
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- [Can we pass this keyword as argument in a method call?](https://www.javatpoint.com/this-keyword#:~:text=this%3A%20to%20pass%20as%20an%20argument%20in%20the%20method)
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`Javatpoint`
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- [Java constructor returns a value, but what?](https://www.javatpoint.com/java-constructor-returns-a-value-but-what)
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`Javatpoint`
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- [What is covariant return type?](https://www.javatpoint.com/covariant-return-type) `Javatpoint`
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- [Private classes and singleton classes in Java](https://www.geeksforgeeks.org/private-constructors-and-singleton-classes-in-java/)
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`GFG`
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- [How to prevent Singleton Pattern from Reflection, Serialization and Cloning?](https://www.geeksforgeeks.org/prevent-singleton-pattern-reflection-serialization-cloning/)
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`GFG`
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- [Double-Check Locking For Singleton Class](https://www.geeksforgeeks.org/java-program-to-demonstrate-the-double-check-locking-for-singleton-class/)
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`GFG`
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# Practice Problems
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- [Inheritance I](https://www.hackerrank.com/challenges/java-inheritance-1/problem?isFullScreen=true) `HackerRank`
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- [Inheritance II](https://www.hackerrank.com/challenges/java-inheritance-2/problem?isFullScreen=true) `HackerRank`
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- [Java Abstract class](https://www.hackerrank.com/challenges/java-abstract-class/problem?isFullScreen=true)
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`HackerRank`
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- [Interface](https://www.hackerrank.com/challenges/java-interface/problem?isFullScreen=true) `HackerRank`
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- [Method Overriding I](https://www.hackerrank.com/challenges/java-method-overriding/problem?isFullScreen=true)
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`HackerRank`
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- [Method Overriding II (Use super keyword)](https://www.hackerrank.com/challenges/java-method-overriding-2-super-keyword/problem?isFullScreen=true)
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`HackerRank`
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- [Java instanceof keyword](https://www.hackerrank.com/challenges/java-instanceof-keyword/problem?isFullScreen=true)
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`HackerRank`
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- [Java Iterator](https://www.hackerrank.com/challenges/java-iterator/problem?isFullScreen=true) `HackerRank`

‎A14__oops/src/introduction/Main.java

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package A14__oops.src.introduction;
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public class Main {
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public static void main(String[] args) {
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// store 5 roll nos
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int[] numbers = new int[5];
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// store 5 names
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String[] names = new String[5];
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// data of 5 students: {roll no, name, marks}
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String[] name = new String[5];
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int[] rno = new int[5];
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float[] marks = new float[5];
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// instantiating an object out of a class
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Student ranit = new Student();
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ranit.name = "Ranit Manik";
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ranit.rno = 34;
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ranit.mark = 40;
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System.out.println(ranit.name);
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System.out.println(ranit.rno);
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System.out.println(ranit.mark);
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}
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}
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// creating a class
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// classes => datatypes
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class Student {
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String name;
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int rno;
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float mark;
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}

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