1-Access modefire in java 1-what is oop main features 2-what is polymorphism 3-abstract and interface concept 4-enca

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1-Access modefire in java
1-what is oop main features
2-what is polymorphism
3-abstract and interface concept
4-encapsolation concept
5-singlton class desgin paterns write code
6-Is java deponds multible inhertance and why ?
7- give max and second max from array in single loop
8-there is linear and non linear data structre give me example;
9-list the types of linked list
10- from circular linked list give the middel using two ways .
11-write code return hight from binary tree .
12-there is array and value and i want to search on arry and return if this value exist or not .
13-there is sort arry and value and i want to search on array and return if this value exist or not.
14 write query that count number of person on each country.
please use Google but please i need solve all questions