Java Character isWhitespace()方法

java.lang.Character.isWhitespace(char ch) 确定指定的字符是否为Java空白。字符是一个Java空白字符,当且仅当它满足下列条件之一:

  • 它是一个Unicode字符空格 (SPACE_SEPARATOR, LINE_SEPARATOR, or PARAGRAPH_SEPARATOR) 但不也是非间断空格('u00A0', 'u2007', 'u202F').

  • 它是 ' ', U+0009 HORIZONTAL TABULATION.

  • 它是 ' ', U+000A LINE FEED.

  • 它是 'u000B', U+000B VERTICAL TABULATION.

  • 它是 'f', U+000C FORM FEED.

  • 它是 ' ', U+000D CARRIAGE RETURN.

  • 它是 'u001C', U+001C FILE SEPARATOR.

  • 它是 'u001D', U+001D GROUP SEPARATOR.

  • 它是 'u001E', U+001E RECORD SEPARATOR.

  • 它是 'u001F', U+001F UNIT SEPARATOR.

1 语法

public static boolean isWhitespace(char ch)

2 参数

ch:要测试字符

3 返回值

如果字符是一个Java空白字符此方法返回true,否则返回false。

4 示例 

package com.yiidian;

/**
 * 一点教程网: http://www.yiidian.com
 */
/**
 * Java Character isWhitespace()方法
 */
import java.lang.*;

public class CharacterDemo {

   public static void main(String[] args) {

      // create 2 char primitives ch1, ch2
      char ch1, ch2;

      // assign values to ch1, ch2
      ch1 = ' ';
      ch2 = 'f';

      // create 2 boolean primitives b1, b2
      boolean b1, b2;

      /**
       *  check if ch1, ch2 are whitespace characters and 
       *  assign results to b1, b2
       */
      b1 = Character.isWhitespace(ch1);
      b2 = Character.isWhitespace(ch2);

      String str1 = "ch1 is a Java whitespace character is " + b1;
      String str2 = "ch2 is a Java whitespace character is " + b2;

      // print b1, b2 values
      System.out.println( str1 );
      System.out.println( str2 );
   }
}

输出结果为:

ch1 is a Java whitespace character is true
ch2 is a Java whitespace character is true

 

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