Binary Search in Java | Algorithm and Implementation | Search Key Element
Binary Search is used to search a key element from multiple elements. Binary search is faster than linear search. Array elements must be in ascending in order to Implement Binary Search.
Binary Search Algorithm :
Step 1 : Calculate the mid element of the collection.
Step 2 : Compare the key items with the mid element.
Step 3 : If key = middle element, then we return the mid index position for the key found.
Step 4 : Else If key is greater than mid element, then the key lies in the right half of the collection. Thus repeat steps 1 to 3 on the lower (right) half of the collection (low).
Step 5 : Else key is less than mid element, then the key is in the upper half of the collection. Hence you need to repeat the binary search in the upper half (High).
Note : From the above steps, in Binary search, half the elements in the collection are ignored just after the first comparison.
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