State pattern - Java
https://github.com/sujjjith/DS/tree/master/src/main/java/ds/designpattern/state
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Class, Reference and Object
If you like housing metaphors a class is like the blueprint for a house. Using this blueprint, you can build as many houses as you like. each house you build (or instantiate, in OO lingo) is an object , also known as an instance . each house also has an address, of course. If you want to tell someone where the house is, you give them a card with the address written on it. That card is the object's reference . If you want to visit the house, you look at the address written on the card. This is called dereferencing . You can copy that reference as much as you like, but there's just one house -- you're just copying the card that has the address on it, not the house itself. Java methods are always pass-by-value, but the value could be an object's reference. So, if I have: Foo myFoo = new Foo (); // 1 callBar ( myFoo ); // 2 myFoo . doSomething () // 4 void callBar ( Foo foo ) { foo = new Foo (); ...
Find pair whose sum is k - java
public class PairSum { public static void main(String[] args) { pair(new int[]{1,2,4,5,6},6); } private static void pair(int[] nums, int k){ int i = 0; int j = nums.length -1; while(i < j){ if(nums[i] + nums[j] == k){ System.out.println(nums[i] +"--------"+nums[j]); i++; j--; }else if(nums[i] + nums[j] > k) j--; ...
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