Use the insert() method of the StringBuilder class in Java to insert a string into a specified location

In Java, use the insert() method of the StringBuilder class to insert a string into a specified position.

In Java, if you need to insert an existing string, you can use the insert() method of the StringBuilder class. method. StringBuilder is a variable character sequence that provides a series of methods to modify and operate strings. Using the insert() method, you can insert a string into the original string at a specified position, thereby implementing the string insertion operation. The syntax of the

insert() method is as follows:

insert(int offset, String str)

where offset represents the insertion position and str represents the string to be inserted. The value range of offset is from 0 to the length of the current string of the StringBuilder object.

The following is a sample code that uses the insert() method for string insertion:

public class StringBuilderExample {
    public static void main(String[] args) {
        StringBuilder sb = new StringBuilder("Hello, World!");
        System.out.println("原始字符串：" + sb);

        // 在指定位置插入字符串
        sb.insert(7, "Java ");
        System.out.println("插入后的字符串：" + sb);
    }
}

In the above code, we created a StringBuilder object sb and initialized its content to "Hello, World !". Then using the insert() method, the string "Java" is inserted at position 7. Finally, the inserted string is output, and the result is "Hello, Java World!".

It should be noted that the value range of offset is from 0 to the length of the current string of the StringBuilder object. If offset exceeds the value range, StringIndexOutOfBoundsException will be thrown.

In addition to the insert() method, the StringBuilder class also provides some other commonly used methods to operate on strings, such as the append() method for adding content to the end of the string, and the delete() method for deleting Characters at specified positions, etc. Using these methods, we can modify and manipulate strings flexibly.

Summary:
In Java, use the insert() method of the StringBuilder class to insert a string into a specified location. Through this method, we can easily insert content in the middle of the string and implement the string insertion operation. When writing a Java program, you can choose an appropriate string processing method according to actual needs to implement operations such as adding, deleting, modifying, and checking strings.

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