Java Character isJavaLetterOrDigit() 方法

2024 年 11 月 6 日 | 阅读 2 分钟

Character 类的 isJavaLetterOrDigit(char ch) 方法用于确定给定的（或指定的）字符是否可以作为 Java 标识符的非首字符。

当且仅当满足以下任一条件时，该字符才属于 Java 标识符的一部分：

该字符是字母。
该字符是货币符号，例如 '$'。
该字符是数字。
该字符是连接标点符号，例如 '_'。
该字符是数字字母。
该字符是组合标记。
该字符是非间距标记。
isIdentifierIgnorable() 方法对给定的字符返回 true。

语法

参数

ch：需要测试的字符。

返回值

isJavaLetterOrDigit(char ch) 方法返回一个布尔值，即如果给定的（或指定的）字符是 Java 标识符的一部分，则返回 true。否则，该方法返回 false。

示例 1

public class JavaCharacterisJavaLetterOrDigitExample1 {
    public static void main(String[] args) {
    char ch1 = '3';
    char ch2 = '6';
    char ch3 = '9';

      boolean b1 = Character.isJavaLetterOrDigit(ch1);
      boolean b2 = Character.isJavaLetterOrDigit(ch2);
      boolean b3 = Character.isJavaLetterOrDigit(ch3);

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

输出

The result for the first character is given as:true
The result for the second character is given as:true
The result for the third character is given as:true.

示例 2

public class JavaCharacterisJavaLetterOrDigitExample2 {
    public static void main(String[] args) {
    char ch1 = 'a';
    char ch2 = 'B';
    char ch3 = 'c';

      boolean b1 = Character.isJavaLetterOrDigit(ch1);
      boolean b2 = Character.isJavaLetterOrDigit(ch2);
      boolean b3 = Character.isJavaLetterOrDigit(ch3);

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

输出

The result for the first character is given as:true
The result for the second character is given as:true
The result for the third character is given as:true

示例 3

public class JavaCharacterisJavaLetterOrDigitExample3 {
    public static void main(String[] args) {
    char ch1 = 'a';
    char ch2 = '*';
    char ch3 = '5';

      boolean b1 = Character.isJavaLetterOrDigit(ch1);
      boolean b2 = Character.isJavaLetterOrDigit(ch2);
      boolean b3 = Character.isJavaLetterOrDigit(ch3);

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

输出

The result for the first character is given as:true
The result for the second character is given as:false
The result for the third character is given as:true

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Java Character isJavaLetterOrDigit() 方法

语法

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示例 1

示例 2

示例 3

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Java Character isJavaLetterOrDigit() 方法

语法

参数

返回值

示例 1

示例 2

示例 3

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