Question

I have

  SomeClass sc1 = new SomeClass();
  SomeClass sc2 = sc1;

Will sc2 change due to sc1(when sc1 is changed) ?
If not, how to do it?

Answer 1

Yes any changes to sc1 will be reflected in sc2 as both of the point to the same object.

So to say if this is the structure of SomeClass

public SomeClass {
  String name;
  //getter setter
}

if you do this

SomeClass sc1 = new SomeClass();
SomeClass sc2 = sc1;

sc1.setName("Hello");

System.out.println(sc2.getName()); // this will print hello since both sc1 and sc2 are pointing to the same object.

But if you do this:

sc1.setName("Hello");
sc1 = null;
System.out.println(sc2.getName()); // this will print hello since only sc1 is null not sc2.