char的封装类Character中常用的方法

Character.isUpperCase();     判断是否是大写字符

Character.isLowerCase();     判断是是否是小写字符

Character.isDigit();                判断是否是数字字符

Character.isLetter();              判断是否是字母(此处还可以根据ASCII码表进行判断)

Character.isSpaceChar();     判断是不是空格字符

Character.isLetterOrDigit();   判断是否是字母或数字字符

public class CharacterTest {
    public static void main(String[] args) {

        Character character = new Character('6');
        char c = character.charValue();

        char ch = 'A';
        //判断是否是大写字符
        boolean upperCase = Character.isUpperCase(ch);
        System.out.println(upperCase);
        //判断是否是数字字符
        boolean digit = Character.isDigit('9');
        System.out.println(digit);
        //判断是是否是小写字符
        boolean a = Character.isLowerCase('a');
        System.out.println(a);
        //判断是否是字母
        boolean a1 = Character.isLetter('a');

        boolean a3 = Character.isLetter(97);

        boolean a2 = Character.isLetter('B');

        boolean a9 = Character.isLetter('9');

        System.out.println(a1);
        System.out.println(a2);
        System.out.println(a3);


      /*  static boolean isDigit ( char ch)
        确定指定字符是否为数字。
        static boolean isDigit ( int codePoint)
        确定指定字符（Unicode 代码点）是否为数字。*/

        boolean digit1 = Character.isDigit('0');

        //a 97  A 65   0 48
        boolean digit2 = Character.isDigit(48);

        System.out.println(digit1);
        System.out.println(digit2);
        //判断是不是空格字符
        boolean spaceChar = Character.isSpaceChar(' ');
        System.out.println(spaceChar);

        //判断是否是字母或数字字符
        boolean letterOrDigit = Character.isLetterOrDigit('9');


    }
}

 (小编也在努力学习更多哟!以后再慢慢挖掘,慢慢补充啦!)

希望对友友们有所帮助!!!!