using string inside string builder code example

Example 1: c# append in strigbuilder

StringBuilder sb = new StringBuilder();
sb.Append("Hello ");
sb.AppendLine("World!");
sb.AppendLine("Hello C#");
Console.WriteLine(sb);

Example 2: java stringbuilder set value

StringBuilder str = new StringBuilder("ABCD"); 
// set char at index 2 to 'L' 
str.setCharAt(2, 'L');