StringvalueOfobj

StringvalueOfobj refers to the Java standard library method String.valueOf(Object obj). It is defined in the String class and provides a null-safe way to obtain a string representation of an object. The method signature is public static String valueOf(Object obj).

Behavior: if obj is null, valueOf returns the string "null". If obj is non-null, it returns the result of obj.toString(). This makes valueOf(Object) effectively a safe alternative to calling toString() directly, since toString() on a null reference would throw a NullPointerException.

Array handling: when the argument is an array, valueOf(Object) delegates to the array’s toString() method. For arrays, this typically yields a string that includes the type and hash code (not a content representation). To display array contents, other utilities such as Arrays.toString(...) or Arrays.deepToString(...) are preferred.

Overloads and usage: String also provides other valueOf overloads for primitives (e.g., valueOf(int), valueOf(long), valueOf(boolean), and valueOf(char)) that convert primitive values to their string representations. In many expressions, especially string concatenation with the + operator, Java implicitly uses String.valueOf(Object) (or an appropriate overload) to convert non-string operands to strings.

Related concepts: valueOf is distinct from toString, which is an instance method that may be overridden by subclass implementations. If an object's toString() method is well-defined, String.valueOf(obj) will reflect that representation when obj is non-null.