equalsIgnoreCase（）函数 忽略大小写的比较函数

                            equalsIgnoreCase()  

public boolean equalsIgnoreCase(String anotherString)

Compares this String to another String, ignoring (忽略) case (大小写) considerations. Two strings are considered equal ignoring case if they are of the same length, and corresponding( 相当、一致) characters in the two strings are equal ignoring case.

Two characters c1 and c2 are considered the same, ignoring case if at least one of the following is true:

• The two characters are the same (as compared by the == operator). //两字符相等(相当于= =)
• Applying the method Character.toUpperCase(char) to each character produces the same result. 
     //c1经过Character.toUpperCase(char)处理后
• Applying the method Character.toLowerCase(char) to each character produces the same result.
      //c1经过Character.toLowerCase(char)处理后

 

Parameters:

anotherString - the String to compare this String against.

Returns:

true if the argument is not null and the Strings are equal, ignoring case; false otherwise.

See Also:

equals(Object), Character.toLowerCase(char) , Character.toUpperCase(char)