When data needs to be changed a lot, should you choose String or StringBuffer in Java?

ofStringType is a Java class used to represent a set of characters. Strings in Java are immutable and their values cannot be changed after creation.

Since strings are immutable, if you try to reassign the value of a string, its reference will point to a new String object, leaving an unused String in memory.

Java provides the StringBuffer class as a replacement for String in places where a large number of modifications need to be made to character strings.

You can modify it repeatedly./operate the content of StringBuffer without leaving many new unused objects.

StringBuilder class is from Java 5The main difference between StringBuffer and StringBuilder introduced from Java

It is recommended to use StringBuilder as much as possible, as it is faster than StringBuffer. However, if thread safety must be guaranteed, the best choice is the StringBuffer object.

Convert String to StringBuilder

StringBuilderclassappend()The method accepts a String value and adds it to the currentObject.

To convert a String value to a StringBuilder object, simply use the append() method to attach it.

Example

In the following Java program, we will convert a string array to a single StringBuilder object.

public class StringToStringBuilder {
　　　public static void main(String args[]) {
　　　　　　String strs[] = {"Arshad", "Althamas", "Johar", "Javed", "Raju", "Krishna"};
　　　　　　StringBuilder sb = new StringBuilder();
　　　　　　sb.append(strs[0]);
　　　　　　sb.append("  ")+strs[1]);
　　　　　　sb.append("  ")+strs[2]);
　　　　　　sb.append("  ")+strs[3]);
　　　　　　sb.append("  ")+strs[4]);
　　　　　　sb.append("  ")+strs[5]);
　　　　　　System.out.println(sb.toString());
　　　}
}

Output Result

Arshad Althamas Johar Javed Raju Krishna