Given a class Repetition:  1. package utils;  2.  3. public class Repetition {  4. public static String twice(String s) { return s + s; }  5. }  and given another class Demo:  1. // insert code here 2.  3. public class Demo {  4. public static void main(

题目

Given a class Repetition:  1. package utils;  2.  3. public class Repetition {  4. public static String twice(String s) { return s + s; }  5. }  and given another class Demo:  1. // insert code here 2.  3. public class Demo {  4. public static void main(String[] args) {  5. System.out.println(twice(”pizza”));  6. }  7. }  Which code should be inserted at line 1 of Demo.java to compile and run Demo to print“pizzapizza”?() 

  • A、 import utils.*;
  • B、 static import utils.*;
  • C、 import utils.Repetition.*;
  • D、 static import utils.Repetition. *;
  • E、 import utils.Repetition.twice();
  • F、 import static utils.Repetition.twice;
  • G、 static import utils.Repetition.twice;

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  • 第1题:

    1. public interface A {  2. public void doSomething(String thing);  3. }  1. public class AImpl implements A {  2. public void doSomething(String msg) { }  3. }  1. public class B {  2. public A doit() {  3. // more code here  4. }  5.  6. public String execute() { 7. // more code here  8. }  9. }  1. public class C extends B {  2. public AImpl doit() {  3. // more code here  4. }  5.  6. public Object execute() {  7. // more code here  8. }  9. }  Which statement is true about the classes and interfaces in the exhibit?() 

    • A、 Compilation will succeed for all classes and interfaces.
    • B、 Compilation of class C will fail because of an error in line 2.
    • C、 Compilation of class C will fail because of an error in line 6.
    • D、 Compilation of class AImpl will fail because of an error in line 2.

    正确答案:C

  • 第2题:

    1. public class A {  2. void A() {  3. System.out.println(“Class A”);  4. }  5. public static void main(String[] args) {  6. new A();  7. }  8. }  What is the result?()  

    • A、 Class A
    • B、 Compilation fails.
    • C、 An exception is thrown at line 2.
    • D、 An exception is thrown at line 6.
    • E、 The code executes with no output.

    正确答案:E

  • 第3题:

    现有2 个文件:  1. package x;  2. public class X {  3. public static void doX() { System.out.print("doX "); }  4. }  和:  1. class Find {  2. public static void main(String [] args) {  3. //insert code here  4. }  5. }  哪两行分别插入到类Find 的第3 行将编译并产生输出“doX”? ()

    • A、doX();
    • B、X.doX();
    • C、x.X.doX();
    • D、x.X myX = new x.X(); myX.doX();

    正确答案:C,D

  • 第4题:

    现有:  1. abstract class Color2  {      2.    //insert code here      3.  }      4.  5. public class Blue2 extends Color2  {  6.public  String getRGB()  {  return  "blue";  }      7.  }  和4个声明:  public abstract  String getRGB();     abstract  String getRGB();  private abstract  String getRGB();      protected abstract String getRGB();  分别插入到第2行,有多少行可以编译?()     

    • A、  0
    • B、  1
    • C、  2
    • D、  3

    正确答案:D

  • 第5题:

    1. public class OuterClass {  2. private double d1 = 1.0;  3. // insert code here  4. }  Which two are valid if inserted at line 3?()  

    • A、 static class InnerOne { public double methoda() { return d1; } }
    • B、 static class InnerOne { static double methoda() { return d1; } }
    • C、 private class InnerOne { public double methoda() { return d1; } }
    • D、 protected class InnerOne { static double methoda() { return d1; } }
    • E、 public abstract class InnerOne { public abstract double methoda(); }

    正确答案:C,E

  • 第6题:

    Given classes defined in two different files:  1. package util;  2. public class BitUtils {  3. public static void process(byte[]) { /* more code here */ }  4. }  1. package app;  2. public class SomeApp {  3. public static void main(String[] args) {  4. byte[] bytes = new byte[256];  5. // insert code here  6. }  7. }  What is required at line 5 in class SomeApp to use the process method of BitUtils?() 

    • A、 process(bytes);
    • B、 BitUtils.process(bytes);
    • C、 util.BitUtils.process(bytes);
    • D、 SomeApp cannot use methods in BitUtils.
    • E、 import util.BitUtils.*; process(bytes);

    正确答案:C

  • 第7题:

    Given  1.  public class Foo {  2.  public static void main (String [] args) }  3.  try { return;}  4.  finally { Syste.out.printIn (“Finally”);}  5. }  6. }   What is the result( )?

    • A、 The program runs and prints nothing.
    • B、 The program runs and prints “Finally”.
    • C、 The code comiles. But an exception is thrown at runtime.
    • D、 The code will not compile because the catch block is missing.

    正确答案:B

  • 第8题:

    定义类:      package utils;      public class Rep{  public static String twice (String s){return s+s ;}     }  再定义另一个类Demo:      //insert code here      public class Demo{  public static void main (String[]  args){      System. out .println( twice( "Hello"));      }      }  在第一行插入哪项代码,可以使程序正常编译和执行?()     

    • A、import utils.*;
    • B、 import utils.Rep.*;
    • C、 import static utils.Rep.twice;
    • D、 static import utils.Rep.twice;

    正确答案:C

  • 第9题:

    多选题
    1. public class OuterClass {  2. private double d1 = 1.0;  3. // insert code here  4. }  Which two are valid if inserted at line 3?()
    A

    static class InnerOne { public double methoda() { return d1; } }

    B

    static class InnerOne { static double methoda() { return d1; } }

    C

    private class InnerOne { public double methoda() { return d1; } }

    D

    protected class InnerOne { static double methoda() { return d1; } }

    E

    public abstract class InnerOne { public abstract double methoda(); }


    正确答案: C,A
    解析: 暂无解析

  • 第10题:

    单选题
    class Mineral {   static String shiny() { return "1"; }   }   class Granite extends Mineral {   public static void main(String [] args) {   String s = shiny() + getShiny();   s = s + super.shiny();   System.out.println(s);   }   static String getShiny() { return shiny(); }   }   结果为:()
    A

    3

    B

    12

    C

    111

    D

    编译失败


    正确答案: D
    解析: 暂无解析

  • 第11题:

    单选题
    Given  1.  public class Foo {  2.  public static void main (String [] args) }  3.  try { return;}  4.  finally { Syste.out.printIn (“Finally”);}  5. }  6. }   What is the result( )?
    A

     The program runs and prints nothing.

    B

     The program runs and prints “Finally”.

    C

     The code comiles. But an exception is thrown at runtime.

    D

     The code will not compile because the catch block is missing.


    正确答案: C
    解析: 暂无解析

  • 第12题:

    单选题
    Given a class Repetition: 1.package utils; 2. 3.public class Repetition{ 4.public static String twice(Strings){returns+s;} 5.} and given another class Demo: 1.//insert code here2. 3.public class Demo{ 4.public static void main(String[]args){ 5.System.out.println(twice("pizza")); 6.} 7.} Which code should be inserted at line 1 of Demo.java to compile and run Demo to print“pizzapizza”?()
    A

    import utils.*;

    B

    static import utils.*;

    C

    importutils.Repetition.*;

    D

    static importutils.Repetition.*;

    E

    import utils.Repetition.twice();

    F

    import static utils.Repetition.twice;

    G

    static import utils.Repetition.twice;


    正确答案: A
    解析: 暂无解析

  • 第13题:

    1. public class a {  2. public void method1() {  3. try {  4. B b=new b();  5. b.method2();  6. // more code here  7. } catch (TestException te) {  8. throw new RuntimeException(te);  9. }  10. }  11. }  1. public class b {  2. public void method2() throws TestException {  3. // more code here  4. }  5. }  1. public class TestException extends Exception {  2. }  Given:  31. public void method() {  32. A a=new a();  33. a.method1();  34. }  Which is true if a TestException is thrown on line 3 of class b?()

    • A、 Line 33 must be called within a try block.
    • B、 The exception thrown by method1 in class a is not required to be caught.
    • C、 The method declared on line 31 must be declared to throw a RuntimeException.
    • D、 On line 5 of class a, the call to method2 of class b does not need to be placed in a try/catch block.

    正确答案:B

  • 第14题:

    class Mineral {   static String shiny() { return "1"; }   }   class Granite extends Mineral {   public static void main(String [] args) {   String s = shiny() + getShiny();   s = s + super.shiny();   System.out.println(s);   }   static String getShiny() { return shiny(); }   }   结果为:()  

    • A、3
    • B、12
    • C、111
    • D、编译失败

    正确答案:D

  • 第15题:

    1. public class A {  2. public void method1() {  3. B b=new B();  4. b.method2();  5. // more code here  6. }  7. }  1. public class B {  2. public void method2() {  3.C c=new C();  4. c.method3();  5. // more code here  6. }  7. }  1. public class C {  2. public void method3() {  3. // more code here  4. }  5. }  Given:  25. try {  26. A a=new A();  27. a.method1();  28. } catch (Exception e) {  29. System.out.print(”an error occurred”);  30. }  Which two are true if a NullPointerException is thrown on line 3 of class C?()

    • A、 The application will crash.
    • B、 The code on line 29 will be executed.
    • C、 The code on line 5 of class A will execute.
    • D、 The code on line 5 of class B will execute.
    • E、 The exception will be propagated back to line 27.

    正确答案:B,E

  • 第16题:

    Given a class Repetition: 1.package utils; 2. 3.public class Repetition{ 4.public static String twice(Strings){returns+s;} 5.} and given another class Demo: 1.//insert code here2. 3.public class Demo{ 4.public static void main(String[]args){ 5.System.out.println(twice("pizza")); 6.} 7.} Which code should be inserted at line 1 of Demo.java to compile and run Demo to print“pizzapizza”?()

    • A、import utils.*;
    • B、static import utils.*;
    • C、importutils.Repetition.*;
    • D、static importutils.Repetition.*;
    • E、import utils.Repetition.twice();
    • F、import static utils.Repetition.twice;
    • G、static import utils.Repetition.twice;

    正确答案:F

  • 第17题:

    Given classes defined in two different files:  1. package util;  2. public class BitUtils {  3. private static void process(byte[] b) { }  4. }  1. package app;  2. public class SomeApp {  3. public static void main(String[] args) {  4. byte[] bytes = new byte[256];  5. // insert code here  6. }  7. }  What is required at line 5 in class SomeApp to use the process method of BitUtils?() 

    • A、 process(bytes);
    • B、 BitUtils.process(bytes);
    • C、 app.BitUtils.process(bytes);
    • D、 util.BitUtils.process(bytes);
    • E、 import util.BitUtils. *; process(bytes);
    • F、 SomeApp cannot use the process method in BitUtils.

    正确答案:F

  • 第18题:

    1. public class enclosingone (  2. public class insideone{}  3. )  4. public class inertest(  5. public static void main (string[]args)(  6. enclosingone eo= new enclosingone ();  7. //insert code here  8. )  9. )    Which statement at line 7 constructs an instance of the inner class?()  

    • A、 InsideOnew ei= eo.new InsideOn();
    • B、 Eo.InsideOne ei = eo.new InsideOne();
    • C、 InsideOne ei = EnclosingOne.new InsideOne();
    • D、 EnclosingOne.InsideOne ei = eo.new InsideOne();

    正确答案:D

  • 第19题:

    1. import java.util.*;  2. public class Test {  3. public static void main(String[] args) {  4. List strings = new ArrayList();  5. // insert code here  6. }  7. }  Which four, inserted at line 5, will allow compilation to succeed?()

    • A、 String s = strings.get(0);
    • B、 Iterator i1 = strings.iterator();
    • C、 String[] array1 = strings.toArray();
    • D、 Iterator i2 = strings.iterator();
    • E、 String[] array2 = strings.toArray(new String[1]);
    • F、 Iterator i3 = strings.iterator();

    正确答案:A,B,D,E

  • 第20题:

    单选题
    Given classes defined in two different files:  1. package util;  2. public class BitUtils {  3. private static void process(byte[] b) { }  4. }  1. package app;  2. public class SomeApp {  3. public static void main(String[] args) {  4. byte[] bytes = new byte[256];  5. // insert code here  6. }  7. }  What is required at line 5 in class SomeApp to use the process method of BitUtils?()
    A

     process(bytes);

    B

     BitUtils.process(bytes);

    C

     app.BitUtils.process(bytes);

    D

     util.BitUtils.process(bytes);

    E

     import util.BitUtils. *; process(bytes);

    F

     SomeApp cannot use the process method in BitUtils.


    正确答案: A
    解析: 暂无解析

  • 第21题:

    单选题
    定义类:      package utils;      public class Rep{  public static String twice (String s){return s+s ;}     }  再定义另一个类Demo:      //insert code here      public class Demo{  public static void main (String[]  args){      System. out .println( twice( "Hello"));      }      }  在第一行插入哪项代码,可以使程序正常编译和执行?()
    A

    import utils.*;

    B

     import utils.Rep.*;

    C

     import static utils.Rep.twice;

    D

     static import utils.Rep.twice;


    正确答案: C
    解析: 暂无解析

  • 第22题:

    单选题
    1. public class enclosingone (  2. public class insideone{}  3. )  4. public class inertest(  5. public static void main (string[]args)(  6. enclosingone eo= new enclosingone ();  7. //insert code here  8. )  9. )    Which statement at line 7 constructs an instance of the inner class?()
    A

     InsideOnew ei= eo.new InsideOn();

    B

     Eo.InsideOne ei = eo.new InsideOne();

    C

     InsideOne ei = EnclosingOne.new InsideOne();

    D

     EnclosingOne.InsideOne ei = eo.new InsideOne();


    正确答案: C
    解析: 暂无解析

  • 第23题:

    单选题
    1. public class A {  2. void A() {  3. System.out.println(“Class A”);  4. }  5. public static void main(String[] args) {  6. new A();  7. }  8. }  What is the result?()
    A

     Class A

    B

     Compilation fails.

    C

     An exception is thrown at line 2.

    D

     An exception is thrown at line 6.

    E

     The code executes with no output.


    正确答案: E
    解析: 暂无解析