code in java.

The two roots of a quadratic equation $a{x}^2+bx+c=0$ can be obtained using the following formula:

$r_1=\frac{-b+\sqrt[\phantom{2}]{b^2-4ac}}{2a}$ and $r_2=\frac{-b-\sqrt[\phantom{2}]{b^2-4ac}}{2a}$

$b^2-4ac$ is called the discriminant of the quadratic equation. If it is positive, the equation has two real

roots. If it is zero, the equation has one root. If it is negative, the equation has no real roots. Write a

Java program that prompts the user to enter values for $a,b,$ and $c$ and displays the result based on

the discriminant. If the discriminant is positive, display two roots. If the discriminant is $0,$ display

one root. Otherwise, display the complex roots. Use JOptionPane dialog boxes to take inputs and

display the output.

Given an integer ArrayList, write a program to move all $0$ s to the end of it while maintaining the

relative order of the non$-$zero elements. Note that you must do this in place without making a copy

of the ArrayList.

Example $1$:

Input: nums $=[0,1,0,3,12]$

Output: $[1,3,12,0,0]$

Example $2$:

Input: nums $=[0]$

Output: $[0]$