Java数据类型教程 - Java字符数据类型
Character类的一个对象包装一个char值。
字符类包含isLetter()和isDigit()方法来检查字符是否为字母和数字。
toUpperCase()和toLowerCase()方法将字符转换为大写和小写。
该类提供了一个构造函数和一个工厂valueOf()方法来从char创建对象。
charValue()方法返回对象包装的char。
例子
以下代码显示了如何创建Character对象以及如何使用它们的一些方法:
public class Main {public static void main(String[] args) {// Using the constructorCharacter c1 = new Character("A");// Using the factory method - preferredCharacter c2 = Character.valueOf("2");Character c3 = Character.valueOf("-");// Getting the wrapped char valueschar cc1 = c1.charValue();char cc2 = c2.charValue();char cc3 = c3.charValue();System.out.println("c1 = " + c1);System.out.println("c2 = " + c2);System.out.println("c3 = " + c3);// Using some Character class methods on c1System.out.println("isLowerCase c1 = " + Character.isLowerCase(cc1));System.out.println("isDigit c1 = " + Character.isDigit(cc1));System.out.println("isLetter c1 = " + Character.isLetter(cc1));System.out.println("Lowercase of c1 = " + Character.toLowerCase(cc1));// Using some Character class methods on c2System.out.println("isLowerCase c2 = " + Character.isLowerCase(cc2));System.out.println("isDigit c2 = " + Character.isDigit(cc2));System.out.println("isLetter c2 = " + Character.isLetter(cc2));System.out.println("Lowercase of c2 = " + Character.toLowerCase(cc2));System.out.println("Uppercase of c3 = " + Character.toUpperCase(cc3));} }
上面的代码生成以下结果。