NucleusTeq Junior Java Developer interview questions

it was a telephonic interview. it starts with simply my introduction and they asked me about my skills then ask me 3 questions on java. 1. why java is platform independent 2.what is constructors in java? 3. why pointers are not used in java. And also ask two more questions like what is the small thing that makes you happy ? and if any senior professional gives you feedback what you expect?