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Showing content from https://www.tutorialspoint.com/java/lang/stringbuilder_append_chararray.htm below:

Java.lang.StringBuilder.append() Method

The java.lang.StringBuilder.append(char[] str) method appends the string representation of the char array argument to this sequence.The characters of the array argument are appended, in order, to the contents of this sequence. The length of this sequence increases by the length of the argument.

Following is the declaration for java.lang.StringBuilder.append() method

public StringBuilder append(char[] str)

str − The characters to be appended.

This method returns a reference to this object.

NA

The following example shows the usage of java.lang.StringBuilder.append() method.

package com.tutorialspoint;

import java.lang.*;

public class StringBuilderDemo {

   public static void main(String[] args) {
  
      StringBuilder str = new StringBuilder("compile ");
      System.out.println("string = " + str);

      // char array
      char[] cArr = new char[]{'o','n','l','i','n','e'};

      /* appends the string representation of char array argument to this StringBuilder */
      str.append(cArr);
      
      // print the StringBuilder after appending
      System.out.println("After append = " + str);
   }
}  

Let us compile and run the above program, this will produce the following result −

string = compile
After append = compile online

java_lang_stringbuilder.htm

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