in java

EX $3\mathrm{.}15$ Write a declaration for each of the following:

a$.$ A line that extends from point $(60,100)$ to point $(30,90).$

b$.$ A rectangle that is $20$ pixels wide, $100$ pixels high, and has its upper$-$left corner at point $(10,10).$

c$.$ A circle that is centered at point $(50,75)$ and has a radius of $30.$

d$.$ An ellipse that is centered at point $(150,180)$ and is $100$ pixels wide and $80$ pixels high.