Converts the entire string into uppercase and lowercase letters, and returns the string in uppercase and lowercase letters.

Converts the entire string into uppercase and lowercase letters, and returns the string in uppercase and lowercase letters.

Recently I used the uppercase Character function. The general idea is to use charAt (0) combined with Character's toUpperCase Method for conversion, and finally combine it into a string.

A few days ago, I saw a great god's code and thought it was highly efficient. If you are interested, please take a look.

The Code is as follows:

/*** Capitalized conversion * @ param str source String. Chinese characters * @ return */public static String firstCharUpper (String str) {if (str! = Null & Character. isLowerCase (str. charAt (0) {// determine whether it is in upper or lower case based on your needs. Modify char [] charArray = str. toCharArray (); if (charArray! = Null) {charArray [0]-= 32; // convert lowercase to uppercase. If it is lowercase to lowercase, It is + = 32. You need to judge return String above. valueOf (charArray) ;}} return str ;}

The following is a string that is similar to the upper-case string.

/*** Capitalized String * @ param str * @ return */public static String strUpperCase (String str) {if (str! = Null) {char [] charArray = str. toCharArray (); for (int I = 0; I <str. length (); I ++) {if (Character. isLowerCase (str. charAt (I) charArray [I]-= 32;} return String. valueOf (charArray);} return str;}/*** String lowercase * @ param str * @ return */public static String strLowerCase (String str) {if (str! = Null) {char [] charArray = str. toCharArray (); for (int I = 0; I <str. length (); I ++) {if (Character. isUpperCase (str. charAt (I) charArray [I] + = 32;} return String. valueOf (charArray);} return str ;}

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@ Ink