java.lang.Character 类–方法|集合 2
原文:https://www . geesforgeks . org/Java-lang-character-class-methods-set-2/
朗。字符方法
Java . lang . character class–methods | Set 1
下面讨论字符类的方法:
-
toUpperCase():Java . lang . toUpperCase(char arg)方法基于 Unicode 值将参数中的给定字符转换为大写。 语法:
```java public static char toUpperCase(char arg) Parameters : arg : character to be converted to Upper case Return : Upper case character of the argumented character.
```
-
toLowerCase():Java . lang . toLowerCase(char arg)方法基于 Unicode 值将参数中的给定字符转换为小写。 语法:
public static char toLowerCase(char arg)
Parameters :
arg : character to be converted to Lower case
Return :
Lower case character of the argumented character.
-
isMirrored() : java.lang.Character.isMirrored(char arg) method checks whether passed argument is mirrored or not, based on Unicode values. Mirrored characters should have their glyphs horizontally mirrored when displayed in text that is right-to-left. For example, ‘\u0028’ LEFT PARENTHESIS is semantically defined to be an opening parenthesis. This will appear as a “(” in text that is left-to-right but as a “)” in text that is right-to-left. e.g. : [ ] { } ( ) Syntax :
```java public static boolean isMirrored(char arg) Parameters : arg : argumented character true if char 'arg' is mirrored, else false.
```
解释 toUpperCase()，toLowerCase()，isMirrored()方法使用的 Java 代码
```java // Java program explaining Character class methods // toUpperCase(), toLowerCase(), isMirrored() import java.lang.Character; public class NewClass { public static void main(String[] args) { // Use of toUpperCase() method Character g1 = new Character('g'); Character g2 = new Character('O');
char chUpper = Character.toUpperCase(g1); char chUpper1 = Character.toUpperCase(g2);
System.out.println("Upper value for g : "+ chUpper); System.out.println("Upper value for O : "+ chUpper1); System.out.println("");
// Use of toLowerCase() method char chLower = Character.toLowerCase(g1); char chLower1 = Character.toLowerCase(g2); System.out.println("Lower value for G : "+ chLower); System.out.println("Lower value for O : "+ chLower1); System.out.println("");
// Use of isMirrored() method Character g3 = new Character('-'); Character g4 = new Character(')'); Character g5 = new Character('{'); Character g6 = new Character(']');
boolean checkBool1 = Character.isMirrored(g3); boolean checkBool2 = Character.isMirrored(g4); boolean checkBool3 = Character.isMirrored(g5); boolean checkBool4 = Character.isMirrored(g6);
System.out.println("Checking - : "+ checkBool1); System.out.println("Checking ) : "+ checkBool2); System.out.println("Checking { : "+ checkBool3); System.out.println("Checking ] : "+ checkBool4); } } ```
输出:
```java Upper value for g : G Upper value for O : O
Lower value for G : g Lower value for O : o
Checking - : false Checking ) : true Checking { : true Checking ] : true
```
- reverse bytes():Java . lang . character . reverse bytes()方法通过反转参数化字符中字节的顺序返回一个字符。 语法:
```java public static char reverseBytes() Parameters : cP : code point, need to check Return : character with reversed order of bytes in the argumented character
```
- isAlphabetic():Java . lang . character . isAlphabetic(int cP)方法检查论证字符(代码点)是否是字母表 语法:
```java public static boolean isAlphabetic(int codePoint) Parameters : cP : code point, need to check.
Return : True if character is a Unicode alphabet, else false Exception : --> NullPointerException --> IndexOutOfBoundsException```
- isValidCodePoint() : java.lang.Character.isValidCodePoint( int cP) method checks whether the argumented Unicode is actually valid or not Syntax :
```java public static boolean isValidCodePoint(int codePoint) Parameters : cP : code point to be tested
Return : true if Min code point < Argumented code point < Max code point```
解释 isValidCodePoint()，reverseBytes()，isAlphabetical()方法使用的 Java 代码
```java // Java program explaining Character class methods // isValidCodePoint(), reverseBytes(), isAlphabetical() import java.lang.Character; public class NewClass { public static void main(String[] args) { // Use of reverseBytes() method Character g1 = new Character('1'); Character g2 = new Character('s');
char chreverse = Character.reverseBytes(g1); char chreverse1 = Character.reverseBytes(g2);
System.out.println("Reverse char for 1 : "+ chreverse); System.out.println("Revrese char for s : "+ chreverse1); System.out.println("");
// Use of isAlphabetical() method int c1 = 101, c2 = 132; boolean check1 = Character.isAlphabetic(c1); boolean check2 = Character.isAlphabetic(c2); System.out.println("Is Unicode 66 alphabetic : "+ check1); System.out.println("Is Unicode 132 alphabetic : "+ check2); System.out.println("");
// Use of isValidCodePoint() method int c3 = 0x012343, c4 = 0x01344ffff; boolean check4 = Character.isValidCodePoint(c4); boolean check3 = Character.isValidCodePoint(c3); System.out.println("Validity check : "+ check3); System.out.println("Validity check : "+ check4); } } ```
输出:
```java Reverse char for 1 : ? Reverse char for s : ?
Is Unicode 66 alphabetic : true Is Unicode 132 alphabetic : false
Validity check : true Validity check : false
```
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