code: public static boolean isStaticConstantInitializerType(ClassNode cn) {
          return cn == int_TYPE ||
                  cn == float_TYPE ||
                  cn == long_TYPE ||
                  cn == double_TYPE ||
                  cn == STRING_TYPE ||
                  // the next items require conversion to int when initializing
                  cn == byte_TYPE ||
                  cn == char_TYPE ||
                  cn == short_TYPE;
      }
docs: Test to determine if a ClassNode is a type belongs to the list of types which
  are allowed to initialize constants directly in bytecode instead of using &lt;cinit&gt;
  <p>
  Note: this only works for ClassNodes created using a
  predefined ClassNode
  
  @param cn the ClassNode to be tested
  @return true if the ClassNode is of int, float, long, double or String type
  @see #make(Class)
  @see #make(String)