Implement a code in java:

• removeChar(String str, char ch) - returns a new string - with the first occurrence of the character ch removed. If the character ch is not contained in the input string S, then this method returns the original string.
  • Example: removeChar("save", 'a') returns the string "sve", and the method call removeChar("abc", 'q') returns "abc"

• testAnagrams (String word1, String word2) - determine whether the two input strings word1 and word2 are anagrams of one another, and return true or false.
  • Example:
    • testAnagrams("melon", "lemon");return true,
    • testAnagrams("hi", "world"); should return false
    • testAnagrams(hello, hello) should return false.