character java是什麼,讓我們一起了解一下?
character類用於對單個字元進行操作,Character類在對象中包裝一個基本類型 char 的值,Java語言爲內置數據類型char提供了包裝類Character類。
character的構造方法示例代碼如下:
public class characterDemo {public static void main(string[] args){//創建對象//Charcter ch=new Character((char)97); Character ch=new Character('a') System.out.println("ch:"+ch);
執行結果:
ch:a
幾個主要方法:
public static boolean isUpperCase(char ch):判斷給定的字元是否是大寫字元
public static boolean isLowerCase(char ch):判斷給定的字元是否是小寫字元
public static boolean isDigit(char ch):判斷給定的字元是否是數字字元
public static char toUpperCase(char ch):把給定的字元轉換爲大寫字元
public static char toLowerCase(char ch):把給定的字元轉換爲小寫字元
具體代碼如下:
public class CharacterDemo {public static void main(string[] args){//public static boolean isUpperCase(charch):判斷給定的字元是否是大寫字元 System.out.println("isUpperCase:"+Character.isUpperCase('A)); System.out.println("isUpperCase:"+Character.isUpperCase('a')); System.out.println("isUpperCase:"+Character.isUpperCase('e'));System.out.println("---------------- ---------"); //public static boolean isLowerCase(charch):判斷給定的字元是否是小寫字待 System.out.println("isLowerCase:"+Character.isLowerCase('A')); System.out.println("isLowerCase:"+Character.isLowerCase('a')); System.out.println("isLowerCase:"+Character.isLowerCase('0')); System.out.println("---------------------------------");//public static boolean isDigit(charch):判斷給定的字元是否是數字字元 System.out.println("isDigit:"+Character.isDigit('A')); System.out.println("isDigit:"+Character.isDigit("a')): System.out.println("isDigit:"+Character.isDigit("0'));System.out.println("------------------ -----------"); //public static char toUpperCase(charch)把給定的字元轉換爲大寫字元 System.out.println("toUpperCase:"+Character.toUpperCase('A')); System.out.println("toUpperCase:"+Character.toUpperCase('a')); System.out.println("---------------------------------");//public static char toLowerCase(char ch):把給定的字元轉換爲小寫字元System.out.println("tolowerCase:"+Character.toLowerCase('A)):System.out.println("toLowerCase:"+Character.toLowerCase('a'));}}
執行結果:
isUpperCase:trueisUpperCase:falseisUpperCase:false