Java Character isSpaceChar() 方法

6 Nov 2024 | 3 分钟阅读

Character 类的 isSpaceChar(char ch) 方法用于确定给定的（或指定的）字符是否为 Unicode 空格字符。

如果字符被 Unicode 标准指定为空格字符，则认为给定的（或指定的）字符为空格字符。

上述方法在字符的通用类别属于以下任一类别时返回 true：

SPACE_SEPARATOR
LINE_SEPARATOR
PARAGRAPH_SEPARATOR

语法

参数

ch：需要测试的字符。

返回值

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

示例 1

public class JavaCharacterIsSapceCharExample1 {
     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 = '\u2028';
      ch3 = '\u2078';

      // Create three boolean primitives b1, b2 and b3.
      boolean b1, b2, b3;
      
     //Check whether the characters ch1, ch2 and ch3 are space characters or not.
      b1 = Character.isSpaceChar(ch1);
      b2 = Character.isSpaceChar(ch2);
      b3 = Character.isSpaceChar(ch3);

      String str1 = "The first character is a space character: " + b1;
      String str2 = "The second character is a space character: " + b2;
      String str3 = "The third character is a space character: " + b3;

      // Print the values of b1, b2 and b3. 
      System.out.println( str1 );
      System.out.println( str2 );
      System.out.println( str2 );
   }
}

输出

The first character is a space character: true
The second character is a space character: true
The second character is a space character: true

示例 2

  public class JavaCharacterIsSapceCharExample2 {
   public static void main(String[] args)
    {
        // Create two char primitives ch1, ch2 and assign the values to them.
        char ch1 = '$'; 
        char ch2 ='\u2025';
 
        // Check whether the character is a space character or not.
        boolean b1 = Character.isSpaceChar(ch1);
        boolean b2 = Character.isSpaceChar(ch2);
        System.out.println("The first character is a space character: " + b1);
        System.out.println("The first character is a space character: " + b2);
    }
}

输出

The first character is a space character: false
The first character is a space character: false

示例 3

import java.util.Scanner;
public class JavaCharacterIsSapceCharExample3 {
   public static void main(String[] args) {
    // Ask the user for the first input. 
       System.out.print("Enter the first input:");
    // Use the Scanner class 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 space character or not.
       for (char ch1 : value1) {
   boolean result1 = Character.isSpaceChar(ch1);
    // Print the result.
       if(result1){
System.out.println("The character '" + ch1 + "' is a space character. ");				
                  }
     else{
System.out.println("The character '" + ch1 + "' is not a space character.");
           }		
       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.isSpaceChar(ch2);
      if(result2){
System.out.println("The character '" + ch2 + "' is a space character. ");				
                }
      else{
System.out.println("The character '" + ch2 + "' is a space character.");
        }		
      System.out.print("Enter the third input:");
       Scanner s3 = new Scanner(System.in);
       char[] value3 = s3.nextLine().toCharArray();
       for (char ch3 : value3) {
      boolean result3 = Character.isSpaceChar(ch3);
      if(result2){
System.out.println("The character '" + ch3 + "' is a space character. ");				
                }
      else{
System.out.println("The character '" + ch3 + "' is not a space character.");
           }		
         }
       }
     }
  }
}

输出

Enter the first input:_
The character '_' is not a space character.
Enter the second input:}
The character '}' is a space character.
Enter the third input:*
The character '*' is not a space character.

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Java Character isSpaceChar() 方法

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Java Character isSpaceChar() 方法

语法

参数

返回值

示例 1

示例 2

示例 3

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