in java pls

As you know, the String class is provided in the Java library. Provide your own implementation for the class (name the new class MyString1) and the following methods:

public MyString1(char[] chars);

public char charAt(int index);

public int length();

public MyString1 substring(int begin, int end);

public MyString1 toLowerCase();

public boolean equals(MyString1 s);

public static MyString1 valueOf(int i);

public MyString1[] split(String s);