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SCJP模拟试题一


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此套试题由60道题组成(实际考试为60道题)。

试题由单选题和多选题组成，单选题将提示：Selecttheonerightanswer.，多选题将提示：Selectallvalidanswers.。

实际考试70%为通过，因此您必须在此套模拟试题中答对42题。答案在这儿。


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Question1:Giventhefollowingclassdefinition:
classA{
protectedinti;
A(inti){
this.i=i;
}
}
Whichofthefollowingwouldbeavalidinnerclassforthisclass?

Selectallvalidanswers.

a)

classB{
}
b)

classBextendsA{
}
c)

classB{
B(){
System.out.println("i="+i);
}
}
d)

classB{
classA{
}
}
e)

classA{
}
answer


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Question2:Whatstatementsaretrueconcerningthemethodnotify()thatisusedinconjunctionwithwait()?
Selectallvalidanswers.

a)ifthereismorethanonethreadwaitingonacondition,onlythethreadthathasbeenwaitingthelongestisnotified

b)ifthereismorethanonethreadwaitingonacondition,thereisnowaytopredictwhichthreadwillbenotifed

c)notify()isdefinedintheThreadclass

d)itisnotstrictlynecessarytoownthelockfortheobjectyouinvokenotify()for

e)notify()shouldonlybeinvokedfromwithinawhileloop

answer


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Question3:Giventhefollowingclass:
classCounter{
publicintstartHere=1;
publicintendHere=100;
publicstaticvoidmain(String[]args){
newCounter().go();
}
voidgo(){
//A
Threadt=newThread(a);
t.start();
}
}
WhatblockofcodecanyoureplaceatlineAabovesothatthisprogramwillcountfromstartHeretoendHere?

Selectallvalidanswers.

a)
Runnablea=newRunnable(){
publicvoidrun(){
for(inti=startHere;i<=endHere;i++){
System.out.println(i);
}
}
};

b)
aimplementsRunnable{
publicvoidrun(){
for(inti=startHere;i<=endHere;i++){
System.out.println(i);
}
}
};

c)
Threada=newThread(){
publicvoidrun(){
for(inti=startHere;i<=endHere;i++){
System.out.println(i);
}
}
};
answer


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