I need help on problem $3$ and $4$ could you please do it in java for me

Problem $3$: Employee Salary Calculator

Complete the following program to determine the raise and new Salary for an employee by adding if$...$ else statements to compute the raise. The

input to the program includes the current annual salary for the employee and a number indicating the performance rating $(1=$excellent,$2=$ good,

and $3=$ poor$).$ An employee with a rating of $1$ will receive a $6\%$ raise, an employee with a rating of $2$ will receive a $4\%$ raise, and one with a rating of

$3$ will receive a $1\mathrm{.}5\%$ raise.

$//$ Salary.java

$//$ Computes the raise and new salary for an employee

import java.util.Scanner;

public class Salary

$($f$)$

public static void main $($String$[]$ args$)$

$\{$

double currentSalary; $//$ current annual salary

double rating; $//$ performance rating

double raise; $//$ dollar amount of the raise

I

Scanner scan $=$ new Scanner$($System$.$in$)$;

$//$ Get the current salary and performance rating

System.out.print $("$Enter the current salary: $")$;

currentSalary $=$ scan. nextDouble$()$;

System.out.print $("$Enter the performance rating: $")$;

rating $=$ scan.nextDouble$()$;

$//$ Compute the raise $--$ Use if $...$ else

$$

$//$ Print the results

System.out.println $("$Amount of your raise: $$"+$ raise$)$;

System.out.println $("$Your new salary: $$"+($currentSalary $+$ raise$))$;

Problem $4$: Powers of $2$ File PowersOf$2.$java contains a skeleton of a program to read in an integer from the user and print out that many powers of

$2,$ starting with $2^0.$

a$)$ Here are the first $4$ powers of $2$: $1248$

b$)$ Modify the program so that instead of just printing y $4$ powers, you print which power each is$,$ e$.$g$.$: Here are the first $4$ powers of $2$:$2^0=12^1$

$=22^2=42^3=8$

$//$ PowersOf$2.$java

$//$ Print out as many powers of $2$ as the user requests

import java.util.Scanner;

public class Powersof$2$

$(\{)$

public static void main$($String$[]$ args$)$

$\{$

int numPowersOf$2$; $//$ How many powers of $2$ to compute

int nextPowerOf$2=1$; $//$ Current power of $2$

int exponent; $//$ Exponent for current power of $2--$ this

$//$ also serves as a counter for the loop

Scanner scan $=$ new Scanner$($System$.$in$)$;

System.out.print $("$How many powers of $2$ would you like printed? $")$;

numPowersOf$2=$ scan.nextInt$()$;

$//$ Print a message saying how many powers of $2$ will be printed

$//$ Initialize exponent $--$ the first thing printed is $2$ to the what?

while $()$

$\{$

$//$ Print out current power of $2$

$//$ Find next power of $2--$ how do you get this from the last one?

$//$ Increment exponent