java code to calculate the distance between any two given points (x1, y1) and (x2, y2)

Problem Specification: Write a java program that calculates the distance between two given points (x1, y1) and (x2, y2). All numbers and return values should be of type double

Input: real variables x1, y1 x2 and y2

Processing: the distance is given by

Output: the distance

Algorithm:

                                              Step 1. Read the four variables x1, x2, y1 and y2 from the user.

                                              Step 2. Initialize variable     

                                              Step 3. Display the

                                              Step 4. End of program

Program Listing: