Use Java's String.trim() function to remove spaces at the beginning and end of a string

Use java's String.trim() function to remove spaces at the beginning and end of a string

When processing strings, you often encounter situations where the beginning and end of the string contain spaces. In order to remove these spaces, we can use the trim() function of the String class provided by java. The trim() function is a very convenient method that can quickly remove spaces at the beginning and end of a string.

The following is a code example that demonstrates how to use the trim() function to remove spaces at the beginning and end of a string:

public class TrimExample {
    public static void main(String[] args) {
        String str = "   Hello, World!   ";
        System.out.println("原始字符串: "" + str + """);
        
        // 使用trim()函数去除字符串首尾的空格
        String trimmedStr = str.trim();
        System.out.println("去除空格后的字符串: "" + trimmedStr + """);
    }
}

The output result is:

原始字符串: "   Hello, World!   "
去除空格后的字符串: "Hello, World!"

In the above code, We first define a string str that contains spaces. Then, we use the str.trim() function to remove the leading and trailing spaces from the string and store the result in the trimmedStr variable. Finally, we print out the original string and the string after removing spaces.

It should be noted that the str.trim() function will only remove spaces at the beginning and end of the string, and the spaces in the middle will not be removed. In the previous example, the spaces in the middle of the string "Hello, World!" are not affected.

In addition to removing spaces, the trim() function can also remove other whitespace characters, such as tabs and newlines. This makes it very useful when processing user input as well as reading the contents of files.

Summary:

By using the trim() function of Java's String class, we can easily remove the spaces at the beginning and end of the string. This function is a very convenient method that can reduce redundant whitespace characters and make string processing more convenient. Whether it is processing user input, reading file contents, or performing string comparisons, the trim() function can provide us with a lot of help.

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