Append a single character to a string or char array in java?

Question

Is it possible to append a single character to the end of array or string in java

for example:

    private static void /*methodName*/ () {                


        

Answer 1

new StringBuilder().append(str.charAt(0))
                   .append(str.charAt(10))
                   .append(str.charAt(20))
                   .append(str.charAt(30))
                   .toString();

This way you can get the new string with whatever characters you want.