Java Character isUnicodeIdentifierPart()方法及实例

Java Character isUnicodeIdentifierPart()方法及实例

java.lang.Character.isUnicodeIdentifierPart() 是java中的一个内置方法,用于确定指定的字符是否可能是Unicode标识符的一部分,而不是第一个字符。

一个字符可能是Unicode标识符的一部分,当且仅当以下陈述之一为真。

  • 它是一个连接标点符号(如’_’)。
  • 它是一个数字
  • 是一个字母
  • 是一个组合标记
  • isIdentifierIgnorable对该字符返回true。
  • 它是一个数字字母(如罗马数字字符)。
  • 它是一个非间隔标记

语法

public static boolean isUnicodeIdentifierPart(datatype character)

参数: 该函数接受一个强制性参数字符。这个参数的数据类型可以是int或char。它指定了要测试的字符。

返回值: 如果该字符可能是Unicode标识符的一部分,该方法返回true,否则返回false。

下面的程序说明了java.lang.Character.isUnicodeIdentifierPart()方法:

程序1: 当传入的参数是一个字符时。

// Code to illustrate the Character.isUnicodeIdentifierPart() 
import java.lang.*;
  
public class gfg {
  
    public static void main(String[] args)
    {
  
        // Creating character primitives
        char char1 = '-';
        char char2 = '7';
        char char3 = 'g';
  
        boolean bool1 = Character.isUnicodeIdentifierPart(char1);
        boolean bool2 = Character.isUnicodeIdentifierPart(char2);
        boolean bool3 = Character.isUnicodeIdentifierPart(char3);
  
        String str1 = " Is " + char1 + " a part of Unicode Identifier: " + bool1;
        String str2 = " Is " + char2 + " a part of Unicode Identifier: " + bool2;
        String str3 = " Is " + char3 + " a part of Unicode Identifier: " + bool3;
  
                // Displaying the strings
        System.out.println(str1);
        System.out.println(str2);
        System.out.println(str3);
    }
}

输出:

Is - a part of Unicode Identifier: false
 Is 7 a part of Unicode Identifier: true
 Is g a part of Unicode Identifier: true

程序2: 当传递的参数是一个字符时。

// Code to illustrate the Character.isUnicodeIdentifierPart() 
import java.lang.*;
  
public class gfg {
  
    public static void main(String[] args)
    {
  
        // Create 2 char primitives c1, c2
        char c1 = '~', c2 = '8';
  
        boolean bool1 = Character.isUnicodeIdentifierPart(c1);
        boolean bool2 = Character.isUnicodeIdentifierPart(c2);
  
        String str1 = c1 + " may be part of a Unicode identifier is " + bool1;
        String str2 = c2 + " may be part of a Unicode identifier is " + bool2;
  
        System.out.println(str1);
        System.out.println(str2);
    }
}

输出:

~ may be part of a Unicode identifier is false
8 may be part of a Unicode identifier is true

以下程序说明了Character.isUnicodeIdentifierPart(int codePoint)方法。

程序1 :

// Code to illustrate the Character.isUnicodeIdentifierPart(int codePoint)
import java.lang.*;
  
public class gfg {
  
    public static void main(String[] args)
    {
  
        // Create 2 int primitives c1, c2
        int c1 = 0x053d, c2 = 0x7840;
  
        boolean bool1 = Character.isUnicodeIdentifierPart(c1);
        boolean bool2 = Character.isUnicodeIdentifierPart(c2);
  
        String str1 = "c1 may be part of a Unicode identifier is " + bool1;
        String str2 = "c2 may be part of a Unicode identifier is " + bool2;
          
        // Displaying the strings
        System.out.println(str1);
        System.out.println(str2);
    }
}

输出:

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

程序2

// Code to illustrate the Character.isUnicodeIdentifierPart(int codePoint)
import java.lang.*;
  
public class gfg {
  
    public static void main(String[] args)
    {
  
        // Creating 2 int primitives c1, c2
        int c1 = 0x065d, c2 = 0x7885;
  
        boolean bool1 = Character.isUnicodeIdentifierPart(c1);
        boolean bool2 = Character.isUnicodeIdentifierPart(c2);
  
        String str1 = "c1 may be part of a Unicode identifier is " + bool1;
        String str2 = "c2 may be part of a Unicode identifier is " + bool2;
  
        // Displaying the strings
        System.out.println(str1);
        System.out.println(str2);
    }
}

输出:

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

参考资料 : https://docs.oracle.com/javase/7/docs/api/java/lang/Character.html#isUnicodeIdentifierPart(char)

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