String s1 = new String("Hello world!"); That code will create an s1 string object and a reference variable. As noted, Java strings are immutable. Once created, a string using string class cannot be ...

In the code example below, you see the immutable String and the mutable StringBuilder class. Each is being passed as a parameter to a method. Knowing that Java only passes by value, what do you ...

In Java, like other languages, code is transformed into an abstract ... like Collections.unmodifiableCollection(). Strings are the best-known immutable Java objects. Because they never change ...