In Java, uppercase and lowercase letters are converted to each other (not using the Java method ).

In Java, uppercase and lowercase letters are converted to each other (not using the Java method ).

Conversion of uppercase and lowercase letters in Java (not using the built-in Java method)

1. Design source code

/***** @ Title: UpperAndLower. java * @ Package: com. you. utils * @ Description: 

2. design results


**************************************** **************************************** * ***** Converts lowercase letters into uppercase letters: ABCDEFGHIKDOERTIOJKSKDKJFKDJFKDFJKABCDEFGHIJKLMNOPQRSTUVWXYZ *************************************** **************************************** * ***** converts uppercase letters into lowercase letters: *************************************** **************************************** * ***** uppercase and lowercase letters are converted to each other: *************************************** **************************************** *******