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)