## Why is this an issue?

Boxing is the process of putting a primitive value into a wrapper object, such as creating an `Integer` to hold an `int` value. Unboxing is the process of retrieving the primitive value from such an object. Since the original value is unchanged during boxing and unboxing, there is no point in doing either when not needed.

Instead, you should rely on Java’s implicit boxing/unboxing to convert from the primitive type to the wrapper type and vice versa, for better readability.

### Noncompliant code example

    public void examinePrimitiveInt(int a) {
      //...
    }

    public void examineBoxedInteger(Integer a) {
      // ...
    }

    public void func() {
      int primitiveInt = 0;
      Integer boxedInt = Integer.valueOf(0);
      double d = 1.0;

      int dIntValue = Double.valueOf(d).intValue(); // Noncompliant; should be replaced with a simple cast

      examinePrimitiveInt(boxedInt.intValue()); // Noncompliant; unnecessary unboxing
      examinePrimitiveInt(Integer.valueOf(primitiveInt));  // Noncompliant; boxed int will be auto-unboxed

      examineBoxedInteger(Integer.valueOf(primitiveInt)); // Noncompliant; unnecessary boxing
      examineBoxedInteger(boxedInt.intValue()); // Noncompliant; unboxed int will be autoboxed
    }

### Compliant solution

    public void examinePrimitiveInt(int a) {
      //...
    }

    public void examineBoxedInteger(Integer a) {
      // ...
    }

    public void func() {
      int primitiveInt = 0;
      Integer boxedInt = Integer.valueOf(0);
      double d = 1.0;

      int dIntValue = (int) d;

      examinePrimitiveInt(primitiveInt);
      examinePrimitiveInt(boxedInt);

      examineBoxedInteger(primitiveInt);
      examineBoxedInteger(boxedInt);
    }