ctrl+shft+t->to check module
ctrl+o->to check overview
Comparison btw Primitive & Reference
each type has its wrapper type
references are different but values are same
Java Memory Model Stack contain primitives like Integer ref,int[]arr1 Heap contain wrappers Integer object,Array object
Integer ref on same Integer pool[-127,128]
Scanner sc=new Scanner(system.in); String word = sc.next(); int i = sc.nextInt();