Write a public instance method named Integer arrayListSum(ArrayList pList). The method shall return the sum of the elements of pList as an Integer. The method shall return 0 when: (1) the pList parameter variable is null; or (2) pList is the empty list.

Write a method that takes in an array of point2d objects, and then analyzes the dataset to find points that are close together. be sure to review the point2d api. in your method, if the distance between any pair of points is less than 10, display the distance and the (x, y)s of each point. for example, "the distance between (3,5) and (8,9) is 6.40312." the complete api for the point2d adt may be viewed at ~pf/sedgewick-wayne/algs4/documenta tion/point2d. html (links to an external site.)links to an external site.. try to write your program directly from the api - do not review the adt's source code.

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How are we able to create photographs differently than 100 years ago? explain your answer in relation to your photograph you selected.