String s1 = "Hello" + ", " + "World";
System.out.println(s1);
// Build a StringBuffer, and append some things to it.
StringBuffer sb2 = new StringBuffer();
sb2.append("Hello");
sb2.append(',");
sb2.append(' ");
sb2.append("World");
// Get the StringBuffer's value as a String, and print it.
String s2 = sb2.toString();
System.out.println(s2);
// Now do the above all over again, but in a more
// concise (and typical "real-world" Java) fashion.
StringBuffer sb3 = new StringBuffer().append("Hello").
append(',").append(' ").append("World");
System.out.println(sb3.toString());
// Exercise for the reader: do it all AGAIN but without
// creating any temporary variables.
