How to determine whether a character is a number in java

In C, you can use isdigit() to determine whether a character is a number, and isalpha() to determine whether a character is a letter. Similar methods in JAVA are mainly It is a static method of the Character class:

The example is as follows:

Character.isDigit( char ch )   // 判断ch是否是数字字符，如'1'，'2‘，是返回true。
否则返回false

Character.isLowerCase(c) || Character.isUpperCase(c) // 判断ch是否是字母字符，如'a'，'b‘，是返回true。
否则返回false

Character.isLetterOrDigit( char ch ) // 判断ch是否是字母或数字字符，如'a'，'b‘，'1'，'2'，是返回true。
否则返回false

Recommended tutorial: java introductory tutorial

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