character java

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character java是什么，让我们一起了解一下？

character类用于对单个字符进行操作，Character类在对象中包装一个基本类型 char 的值，Java语言为内置数据类型char提供了包装类Character类。

character的构造方法示例代码如下：

public class characterDemo {public static void main(string[] args){//创建对象//Charcter ch=new Character((char)97); Character ch=new Character('a') System.out.println("ch:"+ch);

运行结果：

ch:a

几个主要方法：

public static boolean isUpperCase(char ch):判断给定的字符是否是大写字符

public static boolean isLowerCase(char ch):判断给定的字符是否是小写字符

public static boolean isDigit(char ch):判断给定的字符是否是数字字符

public static char toUpperCase(char ch):把给定的字符转换为大写字符

public static char toLowerCase(char ch):把给定的字符转换为小写字符

具体代码如下：

public class CharacterDemo {public static void main(string[] args){//public static boolean isUpperCase(charch):判断给定的字符是否是大写字符 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):判断给定的字符是否是小写字待 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):判断给定的字符是否是数字字符 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)把给定的字符转换为大写字符 System.out.println("toUpperCase:"+Character.toUpperCase('A')); System.out.println("toUpperCase:"+Character.toUpperCase('a')); System.out.println("---------------------------------");//public static char toLowerCase(char ch):把给定的字符转换为小写字符System.out.println("tolowerCase:"+Character.toLowerCase('A)):System.out.println("toLowerCase:"+Character.toLowerCase('a'));}}

运行结果：

isUpperCase:trueisUpperCase:falseisUpperCase:false