阅读下面代码: import java.util.ArrayList; public class Demo { public static void main(String[] args) { ArrayList list = new ArrayList(); list.add("aaa"); list.add("bbb"); list.add("ccc"); for (Object obj :
A.[aaa,ccc]
B.[aaa,bbb,ccc]
C.[ ]
D.以上都不对
A.[aaa,ccc]
B.[aaa,bbb,ccc]
C.[ ]
D.以上都不对
第1题
A.Thesetvariablecontainsallsixelementsfromthecollcollection,andtheorderisguaranteedtobepreserved.
B.Thesetvariablecontainsonlythreeelementsfromthecollcollection,andtheorderisguaranteedtobepreserved.
C.Thesetvariablecontainsallsixelementsfromthecoilcollection,buttheorderisNOTguaranteedtobepreserved.
D.Thesetvariablecontainsonlythreeelementsfromthecoilcollection,buttheorderisNOTguaranteedtobepreserved.
第2题
第3题
A.for(Objecto:list)
B.for(Iteratoro:list)
C.for(Objecto:list.iterator())
D.for(Iteratoro:list.iterator();o.hasNext();)
第4题
A.for(Objecto:list)
B.for(Iteratoro:list)
C.for(Objecto:list.iterator())
D.for(Iteratoro:list.iterator();o.hasNext();)
第5题
第6题
*
*
*
* * */ public class ScoreAnalysis { List<integer> scores = new ArrayList<>(80); public ScoreAnalysis() { super(); //任务1:随机生成有效成绩,并添加到scores集合中 } /** * 任务2:统计各分数段人数 *
*
*
*
*
*
*/ public void segmentStatistics() { } /** * 任务3:找出最高分和最低分 */ public void maxAndMin() { } /** * 任务4:计算全班平均分 */ public void average() { } public static void main(String[] args) { ScoreAnalysis scoreAnalysis = new ScoreAnalysis(); scoreAnalysis.maxAndMin(); scoreAnalysis.average(); scoreAnalysis.segmentStatistics(); } }
第7题
publicclassNameList{
privateListnames=newArrayList();
publicsynchronizedvoidadd(Stringname){names.add(name);}
publicsynchronizedvoidprintAll(){
for(inti=0;iSystem.out.print(names.get(i)+);
}
}
publicstaticvoidmain(String[]args){
finalNameListsl=newNameList();
for(inti=0;i<2;i++){
newThread(){
publicvoidruin(){
sl.add(”A”);
sl.add(”B”);
sl.add(”C”);
sl.printAll();
}
}.start();
}
}
}
Whichtwostatementsaretrueifthisclassiscompiledandrun?()
第8题
1.importjava.util.*;
2.classForInTest{
3.staticListlist-newArrayList():
4.
5.staticListgetList(){returnlist;}
6.
7.publicstaticvoidmain(Strincj[]args){
8.list.add("a");list.add("b");list.add("c");
9.//insertcodehere
10.System.out.print(o);
11.}
12.}
第9行插入哪一项将输出abc?()
第9题
A.apple:apple
B.carrot:apple
C.apple:banana
D.banana:apple
E.carrot:carrot
F.carrot:banana
第10题
A.FileOutputStream
B.ByteArrayOutputStream
C.BufferedOutputStream
D.FileWriter
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