Which statement is true?

S1 and S3 are just pointers to objects.

After:
s1 = s3,
s3 = s2, and
s2 = null
s1 is pointing to an object, just like s3 (different object). There is one object that lost all connections and thus eligible for garbage connection.

Some code:
System.out.println(“s1 – “+s1.toString());
System.out.println(“s2 – “+s2.toString());
System.out.println(“s3 – “+s3.toString()+”\n”);

s1 = s3;
System.out.println(“s1 = s3;”);
System.out.println(“s1 – “+s1.toString());
System.out.println(“s3 – “+s1.toString()+”\n”);

s3 = s2;
System.out.println(“s3 = s2;”);
System.out.println(“s1 – “+s1.toString());
System.out.println(“s2 – “+s2.toString());
System.out.println(“s3 – “+s3.toString()+”\n”);

s2 = null;
System.out.println(“s2 = null;”);
System.out.println(“s1 – “+s1.toString()); //s1 points to Student@7852e922
//System.out.println(s2.toString()); //s2 is null
System.out.println(“s3 – “+s3.toString()); //s3 still point to Student@6d06d69c
/*
| s1 points to Student@7852e922
| s2 is null
| s3 points to Student@6d06d69c
| => no pointer to Student@15db9742 => eligible for garbage collection
*/
}
output:
s1 – Student@15db9742 <= eligible for garbage collection
s2 – Student@6d06d69c
s3 – Student@7852e922

s1 = s3;
s1 – Student@7852e922
s3 – Student@7852e922

s3 = s2;
s1 – Student@7852e922
s2 – Student@6d06d69c
s3 – Student@6d06d69c

s2 = null;
s1 – Student@7852e922
s3 – Student@6d06d69c