CustomJavaCollection

CustomJavaCollection

Custom collection can manipulate of integer values and forbid adding to collection null, symbols and other types as value.

Current collection presents an array and provides the following operations:

• add();
• delete();
• searchByIndex();
• searchByValue();
• searchAverageValue();
• searchMaxValue();
• searchMinValue();
• isDuplicatesExist();
• searchTerms();

How methods work?

• add() - adding value to the end of the collection and simultaneously increasing existing values on added value.

• delete() - deleting value from the collection and simultaneously decreasing existing values on deleted value.

• searchTerms() - finding two indexes of the collection that gives a sum equals to input value.

Examples of the work.

Test case for array[0]

<Add element = 5 result: [5]

Delete element = 2 result: [5]
Delete element = 0 result: []
Delete element = 100 result: []
Delete element = -1 result: []

Search index = 2, value = null
Search value = 7, index = null

Average value = null
Max value = null
Min value = null

Sum of elements is 2. The number of elements: null>

Test case for array[n]

Add element = 1 result: [1]
Add element = 2 result: [3, 2]
Add element = 3 result: [6, 5, 3]
Add element = 4 result: [10, 9, 7, 4]
Add element = 5 result: [15, 14, 12, 9, 5]
Add element = 6 result: [21, 20, 18, 15, 11, 6]
Add element = 7 result: [28, 27, 25, 22, 18, 13, 7]
Add element = 8 result: [36, 35, 33, 30, 26, 21, 15, 8]
Add element = 9 result: [45, 44, 42, 39, 35, 30, 24, 17, 9]

Delete element = 2 result: [3, 2, -3, -7, -12, -18, -25, -33]
Delete element = 0 result: [-1, -6, -10, -15, -21, -28, -36]
Delete element = 100 result: [-1, -6, -10, -15, -21, -28, -36]
Delete element = -1 result: [-1, -6, -10, -15, -21, -28, -36]

Search index = 2, value = -10
Search value = 7, index = null

Average value = -16
Max value = -1
Min value = -36

Is duplicates exist? - false

Add element = 1 result: [0, -5, -9, -14, -20, -27, -35, 1]
Add element = 1 result: [1, -4, -8, -13, -19, -26, -34, 2, 1]

Is duplicates exist? - true

Sum of elements is 2. The number of elements: [0, 8]
Sum of elements is -12. The number of elements: [0, 3]