How to use StringBuffer and StringBuilder in Java

When modifying strings, you need to use the StringBuffer and StringBuilder classes.Different from the String class, objects of the StringBuffer and StringBuilder classes can be modified multiple times without generating new unused objects.

StringBuffer: When using the StringBuffer class, the StringBuffer object itself will be operated every time instead of generating a new object, so if you need to It is recommended to use StringBuffer to modify strings.

StringBuilder: The StringBuilder class was proposed in Java 5. The biggest difference between it and StringBuffer is that the methods of StringBuilder are not thread-safe (cannot be accessed synchronously). Since StringBuilder has a speed advantage compared to StringBuffer, it is recommended to use the StringBuilder class in most cases.

StringBuilder usage example:

public class RunoobTest{ public static void main(String args[]){ StringBuilder sb = new StringBuilder(10); sb.append("Runoob.."); System.out.println(sb); sb.append("!"); System.out.println(sb); sb.insert(8, "Java"); System.out.println(sb); sb.delete(5,8); System.out.println(sb); } } // 实例编译运行结果如下： // Runoob.. // Runoob..! // Runoob..Java! // RunooJava!

#However, when the application requires thread safety, the StringBuffer classmust be used. StringBuffer usage example:

public class Test { public static void main(String args[]) { StringBuffer sBuffer = new StringBuffer("稀土掘金："); sBuffer.append("www"); sBuffer.append(".juejin"); sBuffer.append(".cn"); System.out.println(sBuffer); } } // 实例编译运行结果如下： // 稀土掘金：www.juejin.cn

StringBuffer method

Main methods supported by the StringBuffer class:

Other common methods of the StringBuffer class:

Method instance:\color{red}{Method instance:}Method instance:

reverse() Method instance:

public synchronized StringBuffer reverse()

Description:

Replace this character sequence with its reversed form.

Parameters:

None

Return value:

The reversed form of the character sequence.

public class Test { public static void main(String args[]) { String string="niJeuJ"; String reverse = new StringBuffer(string).reverse().toString(); System.out.println("字符串反转前:"+string); System.out.println("字符串反转后:"+reverse); } } // 以上程序执行结果为： // 字符串反转前:niJeuJ // 字符串反转后:JueJin

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