static boolean equalsIgnoreCase(final CharSequence str1, final CharSequence str2) {
    """
	<p>
	Compares two CharSequences, returning {@code true} if they represent
	equal sequences of characters, ignoring case.
	</p>
	
	<p>
	{@code null}s are handled without exceptions. Two {@code null}
	references are considered equal. Comparison is case insensitive.
	</p>
	
	<pre>
	equalsIgnoreCase(null, null)   = true
	equalsIgnoreCase(null, "abc")  = false
	equalsIgnoreCase("abc", null)  = false
	equalsIgnoreCase("abc", "abc") = true
	equalsIgnoreCase("abc", "ABC") = true
	</pre>
	
	@param str1
	the first CharSequence, may be {@code null}
	@param str2
	the second CharSequence, may be {@code null}
	@return {@code true} if the CharSequence are equal, case insensitive,
	or both {@code null}; {@code false} otherwise
    """
		if(str1==str2) {
			return true;
		} else if(str1==null||str2==null) {
			return false;
		} else if(str1.length()!=str2.length()) {
			return false;
		} else {
			return regionMatches(str1,true,0,str2,0,str1.length());
		}
	}
static boolean equalsIgnoreCase(final CharSequence str1, final CharSequence str2) {
		if(str1==str2) {
			return true;
		} else if(str1==null||str2==null) {
			return false;
		} else if(str1.length()!=str2.length()) {
			return false;
		} else {
			return regionMatches(str1,true,0,str2,0,str1.length());
		}
	}
static boolean equalsIgnoreCase ( final CharSequence str1 , final CharSequence str2 ) { if ( str1 == str2 ) { return true ; } else if ( str1 == null || str2 == null ) { return false ; } else if ( str1 . length ( ) != str2 . length ( ) ) { return false ; } else { return regionMatches ( str1 , true , 0 , str2 , 0 , str1 . length ( ) ) ; } }
<p>
Compares two CharSequences, returning {@code true} if they represent
equal sequences of characters, ignoring case.
</p>

<p>
{@code null}s are handled without exceptions. Two {@code null}
references are considered equal. Comparison is case insensitive.
</p>

<pre>
equalsIgnoreCase(null, null)   = true
equalsIgnoreCase(null, "abc")  = false
equalsIgnoreCase("abc", null)  = false
equalsIgnoreCase("abc", "abc") = true
equalsIgnoreCase("abc", "ABC") = true
</pre>

@param str1
the first CharSequence, may be {@code null}
@param str2
the second CharSequence, may be {@code null}
@return {@code true} if the CharSequence are equal, case insensitive,
or both {@code null}; {@code false} otherwise
<p > Compares two CharSequences returning { @code true } if they represent equal sequences of characters ignoring case . < / p >