which order is an equivalent to “send out head line”?

题目

which order is an equivalent to “send out head line”?


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  • 第1题:

    Click the Exhibit button.Given:What is the result?()

    A.Line 26 prints "a" to System.out.

    B.Line 26 prints "b" to System.out.

    C.An exception is thrown at line 26 at runtime.

    D.Compilation of class A will fail due to an error in line 6.


    参考答案:A

  • 第2题:

    给出下列的代码,哪行在编译时可能会有错误? ① public void modify() { ② int i,j,k; ③ i=100; ④ while(i>0) { ⑤ j=i*2; ⑥ System.out.println(" The value of j is"+ j); ⑦ k=k+1; ⑧ } ⑨}

    A.line 4

    B.line 6

    C.line 7

    D.line 8


    正确答案:C
    解析:局部变量在使用前必须进行初始化,而代码中的变量k在使用前没有进行初始化。

  • 第3题:

    有Table1,Table2两表,Table2是Table1的从表,Table1表有字段head_id(主键)和head_name,Table2表有字段Line_id(主键),head_id(外键),line_name,现要求查询统计出有那些hand_name在Table2表中有2条以上的数据。请写出你的SQL语句。


    正确答案:select t1.head_name, count(1)   from Table1 t1, Table2 t2  where t1. head_id = t2. head_id  group by t1.head_name  having count(1)>2  

  • 第4题:

    ClicktheExhibitbutton.GiventhiscodefromClassB:25.Aa1=newA();26.Aa2=newA();27.Aa3=newA();28.System.out.println(A.getInstanceCount());Whatistheresult?()

    A.CompilationofclassAfails.

    B.Line28printsthevalue3toSystem.out.

    C.Line28printsthevalue1toSystem.out.

    D.Compilationfailsbecauseofanerroronline28.

    E.Aruntimeerroroccurswhenline25executes.


    参考答案:A

  • 第5题:

    给出下列代码, ( )行在编译时可能会有错误。 ①public void modify( ){ ②int i,j,k; ⑧i=100; ④while(i>0){ ⑤j=i*2; ⑥System.out.println("The value of j is"+j); ⑦k=k+l; ⑧} ⑨}

    A.line 4

    B.line 6

    C.line 7

    D.line 8


    正确答案:C

  • 第6题:

    The relative pronoun "which" in the last paragraph (Line 6) refers to (  ).

    A.experts
    B.periods
    C.theories
    D.issues

    答案:D
    解析: