1. Write a Datetime class, which can input, display and modify dates (year, month, day) and time (hours, minutes, seconds). The program file is named Exe3_1. java. 3. Designing a class system that can describe geometric shapes such as point, line, circle, rectangle and triangle. It can calculate the circumference and area of different shapes (if it can be defined). The program file is named Exe3_3. java.

Filename	Size	Update
Exe3_3.java	2625	2018-11-26
Exe3_1.java	1940	2018-11-26

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