with java. please explain how to write this code

1. Write the following method that returns the intersecting point between two lines (p1, p2) and (p3, p4):

public static Point2D getIntersectingPoint(

Point2D p1, Point2D p2, Point2D p3, Point2D p4);

The method returns null if the two lines are parallel. Write a test program that prompts the user to enter three points and displays the center point. Here is a sample run. (Hint: for finding the intersecting point between two lines, see Programming Exercise 8.31.)

Enter x1, y1, x2, y2, x3, y3, x4, y4: 2 2 5 -1.0 4.0 2.0 -1.0 -2.0

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The intersecting point is at (2.88889, 1.1111)

Enter x1, y1, x2, y2, x3, y3, x4, y4: 2 2 7 6.0 4.0 2.0 -1.0 -2.0 The two lines are parallel.

2. Write the following method that splits a string into substrings using delimiter characters. public static ArrayList split(String s, String delimiters); For example, split("AB#C D?EF#45", "# ?") returns a vector containing AB, C, D, EF, and 45. Write a test program that prompts the user to enter a string and delimiters and displays the substrings separated by a space. (You are not allowed to use the regex for splitting a string in this exercise.)