Java Character getDirectionality()方法及示例

java.lang.Character.getDirectionality() 是Java中的一个内置方法，用于返回指定字符的Unicode方向性属性。字符方向性用于计算文本的视觉排序。未定义的char值的方向性值是DIRECTIONALITY_UNDEFINED。这个方法不能处理补充字符。为了支持所有的Unicode字符，包括补充字符，请在此方法的参数中传递一个整数。

语法

public static byte getDirectionality(char ch)

参数： 该函数接受一个参数 ch ，这是必须的。这个参数指定了要求方向性属性的char。该参数可以是int或char数据类型。

返回值： 该函数返回字节，该字节表示char值的方向性属性。

以下程序说明了上述方法。

程序1 :

// Java program to demonstrate the
// Character.getDirectionality() method
// when the passed parameter is an integer
import java.lang.*;
  
public class gfg {
  
    public static void main(String[] args)
    {
        // create 2 int primitives ch1 and
        // ch2 and assign values to them
        int ch1=0x2424, ch2=0x2c61;
  
        // assign directionality of ch1, ch2 to bp1, bp2
        byte b1 = Character.getDirectionality(ch1);
        byte b2 = Character.getDirectionality(ch2);
  
        System.out.println("Directionality of first primitive is " + b1);
        System.out.println("Directionality of first primitive is " + b2);
    }
}

输出:

Directionality of first primitive is 13
Directionality of first primitive is 0

程序2

// Java program to demonstrate the
// Character.getDirectionality() method
// when the passed parameter is a character
import java.lang.*;
  
public class gfg {
  
    public static void main(String[] args)
    {
        // create 2 int primitives ch1 and
        // ch2 and assign values to them
        char ch1 = 'M', ch2 = '\u06ff';
  
        // assign directionality of ch1, ch2 to bp1, bp2
        byte b1 = Character.getDirectionality(ch1);
        byte b2 = Character.getDirectionality(ch2);
  
        System.out.println("Directionality of first primitive is " + b1);
        System.out.println("Directionality of first primitive is " + b2);
    }
}

输出:

Directionality of first primitive is 0
Directionality of first primitive is 2

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