answer 48)

2)s+=i;

only a string acts as if the + operator were overloaded

answer 49)

although the objectives do not specifically mention the need to understand the i/o classes, feedback from people who have taken the exam indicate that you will get questions on this topic. as you will probably need to know this in the real world of java programming, get familiar with the basics. i have assigned these questions to objective 10.1 as that is a fairly vague objective.

1) file f = new file("/","autoexec.bat");
2) datainputstream d = new datainputstream(system.in);
3) outputstreamwriter o = new outputstreamwriter(system.out);

option 4, with the randomaccess file will not compile because the constructor must also be passed a mode parameter which must be either "r" or "rw"

answer 50)

1)o1=o2;

2)b=ob;

4)o1=b;

answer 51)

4) 10020

in the call

another(v,i);

a reference to v is passed and thus any changes will be intact after this call.

answer 52)

1) public void amethod(string s, int i){}
4) public void amethod(int i, string s) {}

overloaded methods are differentiated only on the number, type and order of parameters, not on the return type of the method or the names of the parameters.

answer 53)

4)base b = new base(10);

any call to this or super must be the first line in a constructor. as the method already has a call to this, no more can be inserted.

answer 54)

1) system.out.println(s);
4) system.out.println(iargs);

a class within a method can only see final variables of the enclosing method. however it the normal visibility rules apply for variables outside the enclosing method.