In Java Please!!

The starter project provides a basic implementation of the LList class, including the Node inner$/$private

class. Your task is to complete the following methods:

$$ indexOf$($int value$)$: Returns the index of the first occurrence of the specified value in the list.

Note: The list uses $1-$based indexing, so the first element is at index $1($not index $0).$ If the value is

not found, return $-1.$

$$ reverse$()$: Reverses the order of elements in the list.

$$ removeDuplicates$()$: Removes duplicate values from the list, leaving only unique elements in their

first$-$occurrence order.

Grading Rubric

public class GradingRubric $\{$

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

int score $=0$;

LList list $=$ new LList$()$;

list.add$(1,10)$;

list.add$(2,20)$;

list.add$(3,30)$;

list.add$(4,20)$;

list.add$(5,40)$;

list.add$(6,30)$;

System.out.print$("$Original List: $")$;

list.print$\_$list$()$;

$//$ Test Case $1-3$: Testing $`$indexOf$`$

System.out.println$("$

Test Cases for indexOf:"$)$;

score $+=$ runTestCase$($list$.$indexOf$(10)==1,$ "indexOf$(10)$ should return $1")$;

score $+=$ runTestCase$($list$.$indexOf$(20)==2,$ "indexOf$(20)$ should return $2($first occurrence$)")$;

score $+=$ runTestCase$($list$.$indexOf$(50)==-1,$ "indexOf$(50)$ should return $-1($not found$)")$;

$//$ Test Case $4-6$: Testing $`$add$`$

System.out.println$("$

Test Cases for add:"$)$;

list.add$(50)$;

score $+=$ runTestCase$($list$.$indexOf$(50)==7,$ "add$(50),$ indexOf$(50)$ should return $7")$;

list.add$(60)$;

score $+=$ runTestCase$($list$.$indexOf$(60)==8,$ "add$(60),$ indexOf$(60)$ should return $8")$;

list.add$(20)$;

score $+=$ runTestCase$($list$.$indexOf$(20)==2,$ "indexOf$(20)$ should still return $2($first occurrence$)")$;

$//$ Test Case $7-10$: Testing $`$reverse$`$

System.out.println$("$

Test Cases for reverse:"$)$;

list.reverse$()$;

score $+=$ runTestCase$($list$.$indexOf$(60)==2,$ "After reverse, indexOf$(60)$ should return $2")$;

score $+=$ runTestCase$($list$.$indexOf$(10)==9,$ "After reverse, indexOf$(10)$ should return $9")$;

list.reverse$()$;

score $+=$ runTestCase$($list$.$indexOf$(10)==1,$ "After second reverse, indexOf$(10)$ should return $0")$;

score $+=$ runTestCase$($list$.$indexOf$(60)==8,$ "After second reverse, indexOf$(60)$ should return $7")$;

list.print$\_$list$()$;

System.out.println$($list$.$getLength$())$;

$//$ Test Case $11-15$: Testing $`$removeDuplicates$`$

System.out.println$("$

Test Cases for removeDuplicates:"$)$;

list.removeDuplicates$()$;

score $+=$ runTestCase$($list$.$indexOf$(20)==2,$ "After removeDuplicates, indexOf$(20)$ should return $1")$;

score $+=$ runTestCase$($list$.$indexOf$(30)==3,$ "After removeDuplicates, indexOf$(30)$ should return $2")$;

score $+=$ runTestCase$($list$.$indexOf$(40)==4,$ "After removeDuplicates, indexOf$(40)$ should return $3")$;

score $+=$ runTestCase$($list$.$getLength$()==6,$ "After removeDuplicates, size should be $6")$;

score $+=$ runTestCase$($list$.$indexOf$(60)==6,$ "After removeDuplicates, indexOf$(60)$ should return $4")$;

$//$ Test Case $16-17$: Testing $`$isEmpty$`$ and $`$clear$`$

System.out.println$("$

Test Cases for isEmpty and clear:"$)$;

score $+=$ runTestCase$(!$list.isEmpty$(),$ "List should not be empty"$)$;

list.clear$()$;

score $+=$ runTestCase$($list$.$isEmpty$(),$ "List should be empty after clear"$)$;

$//$ Test Case $18-20$: Testing $`$size$`$ and adding elements after clear

System.out.println$("$

Test Cases for size and adding elements after clear:"$)$;

score $+=$ runTestCase$($list$.$getLength$()==0,$ "After clear, size should be $0")$;

list.add$(100)$;

list.add$(200)$;

score $+=$ runTestCase$($list$.$getLength$()==2,$ "After adding two elements, size should be $2")$;

list.add$(100)$;

list.add$(200)$;

score $+=$ runTestCase$($list$.$getLength$()==4,$ "After adding two elements, size should be $2")$;

$//$ Final Score Display

System.out.println$("$

Total Score: $"+$ score $+"/100")$;

$\}$

$//$ Utility method for running individual test cases

public static int runTestCase$($boolean passed, String description$)\{$

if $($passed$)\{$

System.out.println$("$Passed $(5$ points$)-"+$ description$)$;

return $5$;

$\}$ else $\{$

System.out.println$("$Failed $-"+$ description$)$;

return $0$;

$\}$

$\}$

$\}$