Java Character isWhitespace() 方法

2024年11月6日 | 阅读 4 分钟

Character 类的 isWhitespace(char ch) 方法用于确定给定的字符（Unicode 码点）是否为空格字符。

在 Java 中，如果满足以下任一条件，则字符可被视为空格字符：

该字符是 Unicode 空格字符（是 SPACE_SEPARATOR、LINE_SEPARATOR 或 PARAGRAPH_SEPARATOR），但不能是非中断空格。
该字符必须是水平制表符。
该字符必须是换行符。
该字符必须是垂直制表符。
该字符必须是换页符。
该字符必须是回车符。
该字符必须是文件分隔符。
该字符必须是组分隔符。
该字符必须是记录分隔符。
该字符必须是单元分隔符。

语法

参数

上述方法只需要一个参数

a.) 需要测试的字符。

返回值

isWhitespace(char ch) 方法返回一个布尔值，如果给定的（或指定的）字符是 Java 空格字符，则返回 true。否则，此方法返回 false。

示例 1

public class JavaCharacterisWhitespaceExample1 {
    public static void main(String[] args) {
        // Create three char primitives:ch1, ch2 and ch3
        char ch1, ch2, ch3
                ;
        // Assign the values to the char primitives.
        ch1 = '\n';
        ch2 = 'f';
        ch3 = '\b';
        
        //Create three boolean primitives.
        boolean b1, b2, b3;
       b1 =  Character.isWhitespace(ch1);
       b2 =  Character.isWhitespace(ch2);
       b3 =  Character.isWhitespace(ch3);
      System.out.println("The first character is a white space character :"+b1);
      System.out.println("The second character is a white space character :"+b2);
      System.out.println("The third character is a white space character :"+b3);
   }
}

输出

The first character is a white space character :true
The second character is a white space character :false
The third character is a white space character :false

示例 2

public class JavaCharacterisWhitespaceExample2 {
    public static void main(String[] args) {
        // Create three char primitives:ch1, ch2 and ch3
        char ch1, ch2, ch3;	
                
        // Assign the values to the char primitives.
        ch1 = '\t';
        ch2 = ' ';
        ch3 = '\b';
        
        //Create three boolean primitives.
        boolean b1, b2, b3;
       b1 =  Character.isWhitespace(ch1);
       b2 =  Character.isWhitespace(ch2);
       b3 =  Character.isWhitespace(ch3);
      System.out.println("The first character is a white space character :"+b1);
      System.out.println("The second character is a white space character :"+b2);
      System.out.println("The third character is a white space character :"+b3);
   }
}

输出

The first character is a white space character :true
The second character is a white space character :true
The third character is a white space character :false

Java Character isWhitespace() 方法

Character 类的 isWhitespace(int codePoint) 方法用于确定给定的（或指定的）字符是否为空格字符。

在 Java 中，如果满足以下任一条件，则字符可被视为空格字符：

该字符是 Unicode 空格字符（是 SPACE_SEPARATOR、LINE_SEPARATOR 或 PARAGRAPH_SEPARATOR），但不能是非中断空格。
该字符必须是水平制表符。
该字符必须是换行符。
该字符必须是垂直制表符。
该字符必须是换页符。
该字符必须是回车符。
该字符必须是文件分隔符。
该字符必须是组分隔符。
该字符必须是记录分隔符。
该字符必须是单元分隔符。

语法

参数

上述方法只需要一个参数

a.) codePoint，即需要测试的字符。

返回值

isWhitespace(int codePoint) 方法返回一个布尔值，如果给定的（或指定的）字符是 Java 空格字符，则返回 true。否则，此方法返回 false。

示例 1

public class JavaCharacterisWhitespaceExample_1 {
    public static void main(String[] args) {
        // Initialize three codepoints: cp1, cp2 and cp3
                int cp1 = 49;
                int cp2 = 121;
                int cp3 = 234;
       // Check whether the codepoints are whitespaces or not.
	        boolean check1 = Character.isWhitespace(cp1);
                boolean check2 = Character.isWhitespace(cp2);
                boolean check3 = Character.isWhitespace(cp3);
       // Print the result.
		if(check1){
		System.out.print("The codepoint \'"+cp1+"\' is a whitespace character.\n");
		}
		else{
		System.out.print("The codePoint \'"+cp1+"\' is not a whitespace character.\n");
		}
                
		if(check2){
		System.out.print("The codepoint \'"+cp2+"\' is a whitespace character.\n");
		}
		else{
		System.out.print("The codePoint \'"+cp2+"\' is not a whitespace character.\n");
		}
                
                              if(check3){
		System.out.print("The codepoint \'"+cp3+"\' is a whitespace character.\n");
		}
		else{
		System.out.print("The codePoint \'"+cp3+"\' is not a whitespace character.\n");
	}
    }
}

输出

The codePoint '49' is not a whitespace character.
The codePoint '121' is not a whitespace character.
The codePoint '234' is not a whitespace character.

示例 2

public class JavaCharacterisWhitespaceExample_2 {
    public static void main(String[] args) {
        // Initialize three codepoints: cp1, cp2 and cp3
                int cp1 = 9;
                int cp2 = 10;
                int cp3 = 13;
       // Check whether the codepoints are whitespaces or not.
                boolean check1 = Character.isWhitespace(cp1);
                boolean check2 = Character.isWhitespace(cp2);
                boolean check3 = Character.isWhitespace(cp3);
        // Print the result.
            if(check1){
  System.out.print("The codepoint \'"+cp1+"\' is a whitespace character.\n");
                       }
            else{
System.out.print("The codePoint \'"+cp1+"\' is not a whitespace character.\n");
                       }
                
            if(check2){
System.out.print("The codepoint \'"+cp2+"\' is a whitespace character.\n");
                       }
             else{
System.out.print("The codePoint \'"+cp2+"\' is not a whitespace character.\n");
                  }
                
            if(check3){
System.out.print("The codepoint \'"+cp3+"\' is a whitespace character.\n");
                   }
             else{
System.out.print("The codePoint \'"+cp3+"\' is not a whitespace character.\n");
         }
    }
}

输出

The codepoint '9' is a whitespace character.
The codepoint '10' is a whitespace character.
The codepoint '13' is a whitespace character.

示例 3

public class JavaCharacterisWhitespaceExample_3 {
    public static void main(String[] args) {
        // Initialize three codepoints: cp1, cp2 and cp3
                int cp1 = 9;
                int cp2 = 121;
                int cp3 = 245;
      // check whether the codepoints are whitespaces or not.
               boolean check1 = Character.isWhitespace(cp1);
                boolean check2 = Character.isWhitespace(cp2);
                boolean check3 = Character.isWhitespace(cp3);
        // Print the result.
System.out.println("The first codePoint '"+cp1+"' is a Java space character:"+check1);	
System.out.println("The first codePoint '"+cp2+"' is a Java space character:"+check2);	
System.out.println("The first codePoint '"+cp3+"' is a Java space character:"+check3);	
    }
} 

输出

The first codePoint '9' is a Java space character:true
The first codePoint '121' is a Java space character:false
The first codePoint '245' is a Java space character:false

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Java Character isWhitespace() 方法

语法

参数

返回值

示例 1

示例 2

Java Character isWhitespace() 方法

语法

参数

返回值

示例 1

示例 2

示例 3

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Java Character isWhitespace() 方法

语法

参数

返回值

示例 1

示例 2

Java Character isWhitespace() 方法

语法

参数

返回值

示例 1

示例 2

示例 3

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