Return Value:

Copy the Rectangle.java sample program below and get it to work

Write a Triangle.java program with a class named Triangle that contains three integer instance variables $($properties$)$ named: sideOne, sideTwo, sideThree.

The class should include a constructor, accessor, and mutator methods that can show and change the above variables.

Write and test a method int perimeter$($int sideOne, int sideTwo, int SideThree$),$ which returns the sum of those $3$ sides to the main$()$

Save and submit your program as Rectangle.java, Triangle.java

Rectangle.java sample program:

Rectangle.java

class Rectangle

$\{$

$//$ instance variables

int length, width;

$//$ constructor

Rectangle$($int newL, int newW$)$

$\{$

length $=$ newL;

$\}$

width $=$ neww;

$//$ mutators

void changeL$($int newL$)\{$ length $=$ newL; $\}$

void changew$($int newW$)$ width $=$ newW;