Shulou(Shulou.com)06/03 Report--

This article mainly introduces "the summary of the usage of StringBuffer class in String". In the daily operation, I believe that many people have doubts about the summary of the usage of StringBuffer class in String. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts of "summary of the usage of StringBuffer class in String". Next, please follow the editor to study!

StringBuffer class

First, the string buffer is a container. You cannot inherit without subclasses.

Features: variable length; operable with multiple data types; can be changed into a string through toString ().

2. Storage method

1. StringBuffer append (); adds the specified data to the end of the existing data. No overloading of byte and short

StringBuffer sb = new StringBuffer ()

Sb.append (34) .append ("abc") .append ("de"); method call chain: this object is returned

Example:

StringBuffer sb = new StringBuffer ()

StringBuffer sb1 = sb.append (34)

Sop (sb==sb1) true the same object

Sop (sb.toString ()); 34

Sop (sb1.toString ()); 34

2. StringBuffer Insert (Index, any type of data) inserts the data into the specified Index location

Sb.insert (1, "hi")

III. Deletion method

StringBuffet Delete (int start,int end); contains the head but not the tail

StringBuffer deleteCharAt (int index); deletes the specified position character

Sb.delete (0menthsb.length ()) empties the buffer

IV. Acquisition method

Char charAt (int index)

Int indexOf (String str)

Int lastindexOf (String str)

Int length ()

String subString (int start,int end)

V. Modification method

Sb.replace (int start,int end,String str)

Sb.setChrAt (2) replaces a character

Void setCharAt (int index,char ch)

VI. Flip method

StringBuffer reverse ()

Save the contents of srcBegin to srcEnd in StringBuffer to the character array, starting with dstBegin

Void getChars (int srcBegin,int srcEnd,char [] dst,int dstBegin) eight: StringBuilder class

Appears after the JDK1.5 version

StringBuilder threads are not synchronized, StringBuffer thread synchronization is safe, and only one place is allowed to use

StringBuilder is faster, does not need to judge the lock, single-thread use

At this point, the study on the "summary of the usage of StringBuffer classes in String" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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