Character類的一個(gè)對(duì)象包裝一個(gè)char值。
字符類包含isLetter()和isDigit()方法來檢查字符是否為字母和數(shù)字。
toUpperCase()和toLowerCase()方法將字符轉(zhuǎn)換為大寫和小寫。
該類提供了一個(gè)構(gòu)造函數(shù)和一個(gè)工廠valueOf()方法來從char創(chuàng)建對(duì)象。
charValue()方法返回對(duì)象包裝的char。
以下代碼顯示了如何創(chuàng)建Character對(duì)象以及如何使用它們的一些方法:
public class Main { public static void main(String[] args) { // Using the constructor Character c1 = new Character("A"); // Using the factory method - preferred Character c2 = Character.valueOf("2"); Character c3 = Character.valueOf("-"); // Getting the wrapped char values char 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 c1 System.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 c2 System.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)); } }
上面的代碼生成以下結(jié)果。
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