This rule is deprecated; use {rule:java:S1158} instead.

## Why is this an issue?

"Boxing" is the process of putting a primitive value into a primitive-wrapper object. When that’s done purely to use the wrapper class' `toString` method, it’s a waste of memory and cycles because those methods are `static`, and can therefore be used without a class instance. Similarly, using the `static` method `valueOf` in the primitive-wrapper classes with a non-`String` argument should be avoided.

### Noncompliant code example

    int myInt = 4;
    String myIntString = (new Integer(myInt)).toString(); // Noncompliant; creates & discards an Integer object
    myIntString = Integer.valueOf(myInt).toString(); // Noncompliant

### Compliant solution

    int myInt = 4;
    String myIntString = Integer.toString(myInt);