Java Character isJavaIdentifierPart() 方法

2024年11月6日 | 阅读时长 5 分钟

isJavaIdentifierPart(char ch) 字符类的方法用于确定给定的（或指定的）字符是否是 Java 标识符的一部分。

如果以下任一条件为真，则给定字符是 Java 标识符的一部分：

该字符是字母。
该字符是货币符号（如 '$'）。
该字符是连接标点符号（如 '_'）。
该字符是数字。
该字符是数字字母（如罗马数字字符）。
该字符是组合标记。
该字符是非间距标记。
isIdentifierIgnorable() 方法对此特定字符返回 true。

语法

参数

ch：需要测试的字符。

返回值

如果给定的（或指定的）字符是 Java 标识符的一部分，则 isJavaIdentifierPart(char ch) 方法返回布尔值 true。否则，该方法返回 false。

示例 1

import java.util.Scanner;
public class JavaCharacterisJavaIdentifierPartExample_1 {
	public static void main(String[] args) {
       // Ask the user to enter the input. 
	  System.out.print("Enter the first input:");
      // Use scanner to get the user input
	  Scanner s1 = new Scanner(System.in);
      // Gets the user input.
	  char[] value1 = s1.nextLine().toCharArray();
      // Check whether the user input is a part Java Identifier or not.
          for (char ch1 : value1) {
	  boolean result1 = Character.isJavaIdentifierPart(ch1);
      // Print the result.
	  if(result1){
System.out.println("The character '" + ch1 + "' is a part of Java Identifier. ");		
	 }
	else{
System.out.println("The character '" + ch1 + "' is not a part of Java Identifier. ");
	    }
	  System.out.print("Enter the second input:");
	  Scanner s2 = new Scanner(System.in);
	  char[] value2 = s2.nextLine().toCharArray();
          for (char ch2 : value2) {
	  boolean result2 = Character.isJavaIdentifierPart(ch2);
	  if(result2){
System.out.println("The character '" + ch2 + "' is a part of Java Identifier. ");		
	 }
	else{
System.out.println("The character '" + ch2 + "' is not a part of Java Identifier. ");
	    }
          }
       }
   }
}

输出

Enter the first input:&
The character '&' is not a part of Java Identifier.
Enter the second input:A
The character 'A' is a part of Java Identifier.

示例 2

public class JavaCharcaterisJavaIdentifierPartExample_2 {
    public static void main(String[] args) {
      // Create three char primitives ch1, ch2 and ch3.
	      char ch1, ch2, ch3;
	      // Assign the values to ch1, ch2 and ch3.
	      ch1 = ':';
	      ch2 = '\u0013';
	      ch3 = '\u0765';
      // Create three boolean primitives b1, b2 and b3. 
	      boolean b1, b2,b3;
	      // Assign isJavaCharacterIdentifierPart results of ch1, ch2 and ch3 to b1, b2 and b3.
	      b1 = Character.isJavaIdentifierPart(ch1);
	      b2 = Character.isJavaIdentifierPart(ch2);
	      b3 = Character.isJavaIdentifierPart(ch3);
	      String str1 = "The first character is a part of java identifier:  " + b1;
	      String str2 = "The second character is a part of java identifier: " + b2;
	      String str3 = "The third character is a part of java identifier:  " + b3;
	      // Print the values of b1, b2 and b3.
	      System.out.println( str1 );
	      System.out.println( str2 );
	      System.out.println( str3 );
	   }
	}

输出

The first character is a part of java identifier:  false
The second character is a part of java identifier: true
The third character is a part of java identifier:  true

Java Character isJavaIdentifierPart() 方法

Character 类中的 isJavaIdentifierPart(int codePoint) 方法用于确定给定的（或指定的）字符是否是 Java 标识符的一部分。

如果以下任一条件为真，则给定字符是 Java 标识符的一部分：

该字符是字母。
该字符是货币符号（如 '$'）。
该字符是连接标点符号（如 '_'）。
该字符是数字。
该字符是数字字母（如罗马数字字符）。
该字符是组合标记。
该字符是非间距标记。
isIdentifierIgnorable() 方法对此特定字符返回 true。

语法

参数

codePoint：需要测试的字符的 codePoint。

返回值

如果给定的（或指定的）字符是 Java 标识符的一部分，则 isJavaIdentifierPart(int codePoint) 方法返回布尔值 true。否则，该方法返回 false。

示例 3

public class JavaChracterisJavaIdentifierPartExample3 {
   public static void main(String[] args) {	
     // Initialize the codePoints.
	  int codepoint1 = 89;	
          int codepoint2 = 90;	
          int codepoint3 = 110;	
     // Check the results.
   boolean check1 = Character.isJavaIdentifierPart(codepoint1);
   boolean check2 = Character.isJavaIdentifierPart(codepoint2);
   boolean check3 = Character.isJavaIdentifierPart(codepoint3);
     // print result
	if (check1) {
System.out.print("The first codepoint \'" + codepoint1 + "' is a part of Java identifier.\n");
	} else {
System.out.print("The first codepoint \'" + codepoint1 + "' is not a part of Java identifier.\n");
		}
        if (check2) {
System.out.print("The second codepoint \'" + codepoint2 + "' is a part of Java identifier.\n");
	} else {
System.out.print("The second codepoint \'" + codepoint2 + "' is not a part of Java identifier.\n");
		}
        if (check3) {
System.out.print("The third codepoint \'" + codepoint3 + "' is a part of Java identifier.\n");
	} else {
System.out.print("The third codepoint \'" + codepoint3 + "' is not a part of Java identifier.\n");
		}		
	}
}

输出

The first codepoint '89' is a part of Java identifier.
The second codepoint '90' is a part of Java identifier.
The third codepoint '110' is a part of Java identifier.

示例 4

public class JavaChracterisJavaIdentifierPartExample4 {
   public static void main(String[] args) {
      char cp1 = '_'; 
      char cp2 = '5';
      char cp3 = '9';

      boolean b1 = Character.isJavaIdentifierPart(cp1);
      boolean b2 = Character.isJavaIdentifierPart(cp2);
      boolean b3 = Character.isJavaIdentifierPart(cp2);

      System.out.println("The boolean value for the first codePoint is given as: "+ b1);
      System.out.println("The boolean value for the second codePoint is given as: "+ b2);
      System.out.println("The boolean value for the third codePoint is given as: "+ b3);
   }
}

输出

The boolean value for the first codePoint is given as: true
The boolean value for the second codePoint is given as: true
The boolean value for the third codePoint is given as: true

示例 5

public class JavaChracterisJavaIdentifierPartExample5 {
   public static void main(String[] args) {
      char cp1 = 'A'; 
      char cp2 = 'G';
      char cp3 = 'k';

      boolean b1 = Character.isJavaIdentifierPart(cp1);
      boolean b2 = Character.isJavaIdentifierPart(cp2);
      boolean b3 = Character.isJavaIdentifierPart(cp2);

      System.out.println("The boolean value for the first codePoint '" + cp1 + "' is given as: "+ b1);
      System.out.println("The boolean value for the second codePoint '" + cp2 + "' is given as: "+ b2);
      System.out.println("The boolean value for the third codePoint '" + cp3 + "' is given as: "+ b3);
   }
}

输出

The boolean value for the first codePoint 'A' is given as: true
The boolean value for the second codePoint 'G' is given as: true
The boolean value for the third codePoint 'k' is given as: true

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Java Character isJavaIdentifierPart() 方法

语法

参数

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示例 1

示例 2

Java Character isJavaIdentifierPart() 方法

语法

参数

返回值

示例 3

示例 4

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Java Character isJavaIdentifierPart() 方法

语法

参数

返回值

示例 1

示例 2

Java Character isJavaIdentifierPart() 方法

语法

参数

返回值

示例 3

示例 4

示例 5

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