Java Character.isJavaIdentifierPart()用法及代碼示例

1. Character.isJavaIdentifierPart(int codePoint)是Java中的一種內置方法，該方法確定指定字符是否可能是Java標識符的一部分，而不是第一個字符。
   如果滿足以下任一條件，則字符可能是Java標識符的一部分：
   • 這是一封信
   • 它是貨幣符號(例如“ $”)
   • 它是連接的標點符號(例如“ _”)
   • 這是一個數字
   • 它是一個數字字母(例如羅馬數字字符)
   • 這是一個組合標記
   • 這是一個非間距標記
   • isIdentifierIgnorable對字符返回true。

   用法:

   public static boolean isJavaIdentifierPart(int codePoint)

   參數：Integer數據類型的參數codePoint是指要測試的字符(Unicode代碼點)。

   
   

   返回值：如果字符可能是Java標識符的一部分，則Character類的isJavaIdentifierPart(int codepoint)方法返回true。否則為假。

   下麵的程序用於說明Character.isJavaIdentifierPart(int codepoint)方法：
   示例1:

   // Java program to illustrate 
   // Character.isJavaIdentifierPart() method 
   import java.lang.*; 
     
   public class gfg { 
     
       public static void main(String[] args) 
       { 
     
           // Create 2 int primitives c1, c2 
           int c1 = 0x01f2, c2 = 0x78c0; 
     
           // Assign isJavaIdentifierPart results of c1, c2 
           // to boolean primitives bool1, bool2 
           boolean bool1 = Character.isJavaIdentifierPart(c1); 
           boolean bool2 = Character.isJavaIdentifierPart(c2); 
     
           String str1 = "c1 may be part of a Java identifier is " + bool1; 
           String str2 = "c2 may be part of a Java identifier is " + bool2; 
     
           System.out.println(str1); 
           System.out.println(str2); 
       } 
   }

   輸出：

   c1 may be part of a Java identifier is true
   c2 may be part of a Java identifier is true
   

   示例2:

   // Java program to illustrate 
   // Character.isJavaIdentifierPart(int codepoint) method 
   import java.lang.*; 
     
   public class gfg { 
     
       public static void main(String[] args) 
       { 
     
           // Create 2 int primitives c1, c2 
           int c1 = 0x85f1, c2 = 0x95c0; 
     
           // Assign isJavaIdentifierPart results of c1, c2 
           // to boolean primitives bool1, bool2 
           boolean bool1 = Character.isJavaIdentifierPart(c1); 
           boolean bool2 = Character.isJavaIdentifierPart(c2); 
     
           String str1 = "c1 may be part of a Java identifier is " + bool1; 
           String str2 = "c2 may be part of a Java identifier is " + bool2; 
     
           // Print b1, b2 values 
           System.out.println(str1); 
           System.out.println(str2); 
       } 
   }

   輸出：

   c1 may be part of a Java identifier is true
   c2 may be part of a Java identifier is true
   

2. Character.isJavaIdentifierPart(char ch)在所有方麵都類似於先前的方法，但是不能處理補充字符。若要支持所有Unicode字符，包括補充字符，請使用前麵的方法。

   用法:

   public static boolean isJavaIdentifierPart(char ch)

   參數：參數ch是字符數據類型，是指要測試的字符。

   返回值：如果字符可能是Java標識符的一部分，則Character類的isJavaIdentifierPart(char ch)方法返回true。否則為假。

   以下程序用於說明Character.isJavaIdentifierPart(char ch)方法的使用：
   示例1:

   // Java program to illustrate 
   // Character.isJavaIdentifierPart(char ch) method 
   import java.lang.*; 
     
   public class gfg { 
     
       public static void main(String[] args) 
       { 
     
           // Create 2 char primitives c1, c2 and assign values 
           char c1 = '5', c2 = '%'; 
     
           // Assign isJavaIdentifierPart results of  
           //c1, c2 to boolean primitives bool1, bool2 
           boolean bool1 = Character.isJavaIdentifierPart(c1); 
           boolean bool2 = Character.isJavaIdentifierPart(c2); 
     
           String str1 = c1 + " may be part of a Java identifier is " + bool1; 
           String str2 = c2 + " may be part of a Java identifier is " + bool2; 
     
           // Print bool1, bool2 values 
           System.out.println(str1); 
           System.out.println(str2); 
       } 
   }

   輸出：

   5 may be part of a Java identifier is true
   % may be part of a Java identifier is false
   

   示例2:

   // Java program to illustrate 
   // Character.isJavaIdentifierPart(char ch) method 
   import java.lang.*; 
     
   public class gfg { 
     
       public static void main(String[] args) 
       { 
     
           // Create 2 char primitives c1, c2 and assign values 
           char c1 = '6', c2 = '*'; 
     
           // assign isJavaIdentifierPart results of  
           //c1, c2 to boolean primitives bool1, bool2 
           boolean bool1 = Character.isJavaIdentifierPart(c1); 
           boolean bool2 = Character.isJavaIdentifierPart(c2); 
     
           String str1 = c1 + " may be part of a Java identifier is " + bool1; 
           String str2 = c2 + " may be part of a Java identifier is " + bool2; 
     
           // Print bool1, bool2 values 
           System.out.println(str1); 
           System.out.println(str2); 
       } 
   }

   輸出：

   6 may be part of a Java identifier is true
   * may be part of a Java identifier is false
   

參考： https://docs.oracle.com/javase/7/docs/api/java/lang/Character.html#isUnicodeIdentifierPart(int)