Use java's Character.isWhitespace() function to determine whether a character is a space

Use java's Character.isWhitespace() function to determine whether a character is a space

In the daily programming process, we often encounter situations where we need to determine whether a character is a space. Java provides a very convenient method: Character.isWhitespace(). This method can determine whether a character is a space character in Unicode, not just ASCII space characters.

The following will introduce how to use the Character.isWhitespace() function and related code examples.

Character.isWhitespace() function is a static method of the Character class in Java. It accepts a parameter of type char and returns a value of type boolean indicating whether the character is a space character.

The following is the definition and sample code of this function:

public static boolean isWhitespace(char ch)

The following is a sample code that uses the Character.isWhitespace() function to determine whether a character is a space:

public class Main {
    public static void main(String[] args) {
        char ch1 = ' ';
        char ch2 = '    '; // 制表符
        char ch3 = '
'; // 换行符
        char ch4 = 'A';

        boolean isWhitespace1 = Character.isWhitespace(ch1);
        boolean isWhitespace2 = Character.isWhitespace(ch2);
        boolean isWhitespace3 = Character.isWhitespace(ch3);
        boolean isWhitespace4 = Character.isWhitespace(ch4);

        System.out.println("ch1 is whitespace: " + isWhitespace1);
        System.out.println("ch2 is whitespace: " + isWhitespace2);
        System.out.println("ch3 is whitespace: " + isWhitespace3);
        System.out.println("ch4 is whitespace: " + isWhitespace4);
    }
}

Run The output of the above code is as follows:

ch1 is whitespace: true
ch2 is whitespace: true
ch3 is whitespace: true
ch4 is whitespace: false

As you can see, the Character.isWhitespace() function can accurately determine whether a character is a space. In the example code, ch1, ch2, and ch3 are common space characters, while ch4 is a non-space character.

When the determined character is a space character, the isWhitespace() function returns true; when the determined character is not a space character, the isWhitespace() function returns false.

It should be noted that the isWhitespace() function can only determine whether a single character is a space character, but cannot determine whether a string is all spaces. If you need to determine whether the entire string is whitespace, you can use other methods, such as using regular expressions or traversing characters to determine.

To summarize, using the Character.isWhitespace() function can easily determine whether a character is a space character. During the programming process, this function can accurately determine whether a character is a space, so that corresponding processing and judgment can be made.

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