1. The comparison between the string can be used equals or compareTo. Equals high efficiency.
The results equals returns a Boolean value
str1.equals (str2) (together with, and if ... else)
compareTo coding demand values in accordance with a difference, compared to the difference, the result returned is of type int. Equal, the result is zero, not equal, return difference
str1.compareTo(str2);
If the comparison value (str1 or str2) is not a string, error.
2. string interception
substring parenthesis string start and end index, the package does not include the left and right.
str1.substring (2); equals 2, taken from the start index, (i.e., starting from c) until the last.
str1.substring (1,2); equals 1, taken from the start index, the index is equal to the end 2 (without subscript is equal to 2).
3. Cutting strings
The result is an array of split
str1.split ( ","); the content in parentheses cutting
str1.split ( ",", 2) ; the content in parentheses cut, cut into two, when the number = 0 or greater than the maximum number of cutting, according to all carried out.
