JAVA题库:格林模拟试题二(下)(6)

文章作者 100test 发表时间 2007:03:14 17:05:14
来源 100Test.Com百考试题网



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

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