question 48)
given the following variables
char c = 'c';int i = 10;double d = 10;long l = 1;string s = "hello";
which of the following will compile without error?
1)c=c+i;
2)s+=i;
3)i+=s;
4)c+=s;
question 49)
which of the following will compile without error?
1) file f = new file("/","autoexec.bat");
2) datainputstream d = new datainputstream(system.in);
3) outputstreamwriter o = new outputstreamwriter(system.out);
4) randomaccessfile r = new randomaccessfile("outfile");
question 50)
given the folowing classes which of the following will compile without error?
interface iface{}class cface implements iface{}class base{}public class obref extends base{ public static void main(string argv[]){ obref ob = new obref(); base b = new base(); object o1 = new object(); iface o2 = new cface(); }}
1)o1=o2;
2)b=ob;
3)ob=b;
4)o1=b;
question 51)
given the following code what will be the output?
class valhold{ public int i = 10;}public class obparm{public static void main(string argv[]){ obparm o = new obparm(); o.amethod(); } public void amethod(){ int i = 99; valhold v = new valhold(); v.i=30; another(v,i); system.out.print( v.i ); }//end of amethod public void another(valhold v, int i){ i=0; v.i = 20; valhold vh = new valhold(); v = vh; system.out.print(v.i); system.out.print(i); }//end of another}
1) 10030
2) 20030
3) 209930
4) 10020