Java Character isWhitespace()方法

java.lang.Character.isWhitespace(int codePoint) 确定指定字符(Unicode代码点)是根据Java的空白。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空格字符 (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(int codePoint)

2 参数

codePoint：要进行测试的字符(Unicode代码点)

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.util.Calendar getInstance()方法的例子
 */
import java.lang.*;

public class CharacterDemo {

   public static void main(String[] args) {

      // create 2 int primitives cp1, cp2
      int cp1, cp2;

      // assign values to cp1, cp2
      cp1 = 0x001c; // represents FILE SEPARATOR
      cp2 = 0x0abc;

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

      /**
       *  check if cp1, cp2 represent whitespace characters 
       *  and assign results to b1, b2
       */
      b1 = Character.isWhitespace(cp1);
      b2 = Character.isWhitespace(cp2);

      String str1 = "cp1 represents Java whitespace character is " + b1;
      String str2 = "cp2 represents Java whitespace character is " + b2;

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

输出结果为：

cp1 represents Java whitespace character is true
cp2 represents Java whitespace character is false