Insert content into a string in Java using the insert() method of the StringBuffer class

Use the insert() method of the StringBuffer class to insert content into a string in Java

In Java programming, the StringBuffer class is a very commonly used string manipulation class. It provides a variety of methods to modify strings, among which the insert() method is a very convenient method for inserting content into a string.

The insert() method is used to insert a character, a character array, a string or a string converted from other data types at the specified position. Its syntax format is as follows:

public StringBuffer insert(int offset, 数据类型 data)

Among them, offset represents the position to be inserted, starting from 0. data represents the content to be inserted, which can be a character, a character array, a string, or a string converted from other data types.

The following is some sample code using the insert() method:

Example 1: Insert a character into a string

StringBuffer sb = new StringBuffer("Hello World");
sb.insert(5, '!');
System.out.println(sb.toString());  // 输出：Hello! World

Example 2: Insert a character into a string Character array

StringBuffer sb = new StringBuffer("Hello World");
char[] array = {'!', '!', '!'};
sb.insert(5, array);
System.out.println(sb.toString());  // 输出：Hello!!! World

Example 3: Insert a string into a string

StringBuffer sb = new StringBuffer("Hello World");
sb.insert(5, "!!!");
System.out.println(sb.toString());  // 输出：Hello!!! World

Example 4: Insert an integer value into a string

StringBuffer sb = new StringBuffer("Hello World");
int num = 2021;
sb.insert(5, num);
System.out.println(sb.toString());  // 输出：Hello2021 World

Example 5: Insert a string into a string Insert a floating-point value into a string

StringBuffer sb = new StringBuffer("Hello World");
float num = 3.14f;
sb.insert(5, num);
System.out.println(sb.toString());  // 输出：Hello3.14 World

By using the insert() method, we can easily insert content into the string and achieve flexible string operations. Whether it is inserting a character, a character array, a string or a string converted from other data types, it can be easily achieved.

It should be noted that since the insert() method of the StringBuffer class will modify the original string object, the modified string needs to be converted into a string through the toString() method before printing or other operations can be performed.

In summary, using the insert() method of the StringBuffer class can easily insert content into a string and achieve flexible string operations. Whether you are inserting a character, a character array, a string, or a string converted from other data types into a string, you can easily implement it through the insert() method. When performing string processing, we can choose to use the insert() method of the StringBuffer class to better meet our needs.

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