package MyImplementations;

$//$ Implementing the String class

public class MyString $\{$

private char$[]$ chars;

$//$ Constructor from a char array

public MyString$($char$[]$ chars$)\{$

this.chars $=$ new char$[$chars$.$length$]$;

for $($int i $=0$; i $$ chars.length; i$++)\{$

this.chars$[$i$]=$ chars$[$i$]$;

$\}$

$\}$

$//$ constructor from a String

public MyString$($String s$)\{$

this$($s$.$toCharArray$())$;

$\}$

$//$ constructor from a MyString

public MyString$($MyString s$)\{$

this$($s$.$toCharArray$())$;

$\}$

$//$ toCharArray

public char$[]$ toCharArray$()\{$

char$[]$ result $=$ new char$[$chars$.$length$]$;

for $($int i $=0$; i $$ chars.length; i$++)\{$

result$[$i$]=$ chars$[$i$]$;

$\}$

return result;

$\}$

$//$ toString

public String toString$()\{$

return new String$($chars$)$;

$//$ Returns the length of the string

public int length$()\{$

$//$ WRITE YOUR CODE HERE

$\}$

$//$ Returns the character at the specified index

public char charAt$($int index$)\{$

$//$ WRITE YOUR CODE HERE

$\}$

$//$ Returns a new MyString that is a substring of this MyString

public MyString substring$($int begin, int end$)\{$

$//$ WRITE YOUR CODE HERE

$\}$

$//$ Returns the MyString that is the concatenation of this MyString and the

$//$ specified MyString

public MyString concat$($MyString s$)\{$

$//$ WRITE YOUR CODE HERE

$\}$

$//$ Returns the MyString that is the concatenation of this MyString and the String

public MyString concat$($String s$)\{$

$//$ WRITE YOUR CODE HERE

$\}$

$//$ indexOf

public int indexOf$($MyString s$)\{$

$//$ WRITE YOUR CODE HERE

$\}$

$//$ indexOf

public int indexOf$($MyString s$,$ int fromIndex$)\{$

$//$ WRITE YOUR CODE HERE

$\}$

$//$ replace oldString with newString

public MyString replace$($MyString oldString, MyString newString$)\{$

$//$ WRITE YOUR CODE HERE

$\}$

public MyString replace$($String oldString, String newString$)\{$

$//$ WRITE YOUR CODE HERE

$\}$

public MyString replace$($char oldChar, char newChar$)\{$

$//$ WRITE YOUR CODE HERE

$\}$

$//$ count

public int count$($MyString s$)\{$

$//$ WRITE YOUR CODE HERE

$\}$

$//$ count

public int count$($String s$)\{$

$//$ WRITE YOUR CODE HERE

$\}$

$//$ count

public int count$($char c$)\{$

$//$ WRITE YOUR CODE HERE

$\}$

$//$ split

public MyString$[]$ split$($MyString regex$)\{$

$//$ WRITE YOUR CODE HERE

$\}$

$//$ split with String

public MyString$[]$ split$($String regex$)\{$

return split$($new MyString$($regex$))$;

$\}$

$//$ trim

public MyString trim$()\{$

$//$ WRITE YOUR CODE HERE

$\}$

$//$ toLowerCase

public MyString toLowerCase$()\{$

$//$ WRITE YOUR CODE HERE

$\}$

$//$ toUpperCase

public MyString toUpperCase$()\{$

$//$ WRITE YOUR CODE HERE

$\}$

$//$ equalsIgnoreCase

public boolean equalsIgnoreCase$($MyString s$)\{$

$//$ WRITE YOUR CODE HERE

$\}$

$//$ compareTopublic int compareTo$($MyString s$)\{$

$//$ WRITE YOUR CODE HERE

$\}//$ compareToIgnoreCase

public int compareToIgnoreCase$($MyString s$)\{$

$//$ WRITE YOUR CODE HERE

$\}$

$//$ startsWith

public boolean startsWith$($MyString s$)\{$

$//$ WRITE YOUR CODE HERE

$\}$

$//$ endsWith

public boolean endsWith$($MyString s$)\{$

$//$ WRITE YOUR CODE HERE

$\}$

$//$ contains

public boolean contains$($MyString s$)\{$

$//$ WRITE YOUR CODE HERE

$\}$

$//$ valueOf

public static MyString valueOf$($Number i$)\{$

$//$ WRITE YOUR CODE HERE

$\}$

$//$ equals

public boolean equals$($Object o$)\{$

$//$ WRITE YOUR CODE HERE

$\}$

$//$ equals for String

public boolean equals$($String s$)\{$

$//$ WRITE YOUR CODE HERE

$\}$

$//$ equals MyString

public boolean equals$($MyString s$)\{$

$//$ WRITE YOUR CODE HERE

$\}$

$//$ hashCode

public int hashCode$()\{$

int h $=0$;

for $($int i $=0$; i $$ length$()$; i$++)\{$

h $=31*$ h $+$ charAt$($i$)$;

$\}$

return h;

$\}$

$//$ All wrapper code below this line

$//$#region

$//$ startsWith String

public boolean startsWith$($String s$)\{$

$//$ WRITE YOUR CODE HERE

$\}$

$//$ endsWith String

public boolean endsWith$($String s$)\{$

$//$ WRITE YOUR CODE HERE

$\}$

$//$ contains String

public boolean contains$($String s$)\{$

$//$ WRITE YOUR CODE HERE

$\}$

$//$ indexOf String

public int indexOf$($String s$)\{$

$//$ WRITE YOUR CODE HERE

$\}//$ indexOf String from index

public int indexOf$($String s$,$ int fromIndex$)\{$

$//$ WRITE YOUR CODE HERE

$\}$

$//$#endregion

$/$ indexOf char

public int indexOf$($char ch$)\{$

$/$WRITE YOUR CODE HERE

$\}$

$//$ indexOf char from index

public int indexOf$($char ch$,$ int fromIndex$)\{$

$//$ WRITE YOUR CODE HERE

$\}$

$\}$

package Editor; import java.io$.$BufferedReader; import java.io$.$BufferedWriter; import java.io$.$IOException; import java.nio.charset.Charset; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import MyImplementations.MyArrayList; import MyImplementations.MyStack; import MyImplementations.MyString; public class Editor $\{$ int row; int col; MyArrayList text; $/**$ the undo stack $*/$ MyStack undoStack; $/**$ the redo stack $*/$ MyStack redoStack; $//$ Current file name MyString fileName; class EditorAction $\{/**$ the row of the action $*/$ int row; $/**$ the column of the action $*/$ int col; $/**$ the text of the action $*/$ MyString text; $/**$ the length of the action $*/$ int length; $/**$ the action type $*/$ ActionType type; $\}$ enum ActionType $\{/**$ insert action $*/$ INSERT, $/**$ delete action $*/$ DELETE, $/**$ replace action $*/$ REPLACE $\}$ public Editor$($String myFilename$)\{$ this$($new MyString$($myFilename$))$; $\}$

i apologize it for being so confusing chegg woulnt allow to me to post google drive for it$.$ please implement all the classes without changing ANYTHING. again tysm hope its not too hard to understand