单选题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) { 

题目
单选题
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);


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  • 第1题:

    1. public class Test {   2. public static void main (String args) {   3. unsigned byte b = 0;   4. b--;   5.   6. }   7. }   What is the value of b at line 5?()  

    • A、 -1
    • B、 255
    • C、 127
    • D、 Compilation will fail.
    • E、 Compilation will succeed but the program will throw an exception at line 4.

    正确答案:D

  • 第2题:

    1. class Pizza {  2. java.util.ArrayList toppings;  3. public final void addTopping(String topping) {  4. toppings.add(topping); 5. }  6. }  7. public class PepperoniPizza extends Pizza {  8. public void addTopping(String topping) {  9. System.out.println(”Cannot add Toppings”);  10. }  11. public static void main(String[] args) {  12. Pizza pizza = new PepperoniPizza();  13. pizza.addTopping(”Mushrooms”);  14. }  15. }  What is the result?() 

    • A、 Compilation fails.
    • B、 Cannot add Toppings
    • C、 The code runs with no output.
    • D、 A NullPointerException is thrown in Line 4.

    正确答案:A

  • 第3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4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5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6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7题:

    单选题
    1. public class Test {   2. public static void main (String args) {   3. unsigned byte b = 0;   4. b--;   5.   6. }   7. }   What is the value of b at line 5?()
    A

     -1

    B

     255

    C

     127

    D

     Compilation will fail.

    E

     Compilation will succeed but the program will throw an exception at line 4.


    正确答案: D
    解析: 暂无解析

  • 第8题:

    单选题
    1. class Pizza {  2. java.util.ArrayList toppings;  3. public final void addTopping(String topping) {  4. toppings.add(topping); 5. }  6. }  7. public class PepperoniPizza extends Pizza {  8. public void addTopping(String topping) {  9. System.out.println(”Cannot add Toppings”);  10. }  11. public static void main(String[] args) {  12. Pizza pizza = new PepperoniPizza();  13. pizza.addTopping(”Mushrooms”);  14. }  15. }  What is the result?()
    A

     Compilation fails.

    B

     Cannot add Toppings

    C

     The code runs with no output.

    D

     A NullPointerException is thrown in Line 4.


    正确答案: D
    解析: 暂无解析

  • 第9题:

    单选题
    ClassOne.java: 1. package com.abe.pkg1; 2. public class ClassOne { 3. private char var = ‘a’; 4. char getVar() { return var; } 5. } ClassTest.java: 1. package com.abe.pkg2; 2. import com.abc.pkg1.ClassOne; 3. public class ClassTest extends ClassOne { 4. public static void main(String[] args) { 5. char a = new ClassOne().getVar();6. char b = new ClassTest().getVar(); 7. } 8. } What is the result?()
    A

     Compilation fails.

    B

     Compilation succeeds and no exceptions are thrown.

    C

     An exception is thrown at line 5 in ClassTest.java.

    D

     An exception is thrown at line 6 in ClassTest.java.


    正确答案: B
    解析: 暂无解析

  • 第10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=newbyte[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

    importutil.BitUtils.*;process(bytes);

    F

    SomeApp cannot use the process method in BitUtils.


    正确答案: E
    解析: 暂无解析

  • 第11题:

    单选题
    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;


    正确答案: D
    解析: 暂无解析

  • 第12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

  • 第13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14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15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16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17题:

    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;

    正确答案:F

  • 第18题:

    单选题
    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: A
    解析: 暂无解析

  • 第19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20题:

    单选题
    1. public class SimpleCalc {  2. public int value;  3. public void calculate() { value += 7; }  4. } And:  1. public class MultiCalc extends SimpleCalc {  2. public void calculate() { value -= 3; }  3. public void calculate(int multiplier) {  4. calculate();  5. super.calculate();  6. value *=multiplier;  7. }  8. public static void main(String[] args) {  9. MultiCalc calculator = new MultiCalc();  10. calculator.calculate(2);  11. System.out.println(”Value is: “+ calculator.value);  12. }  13. }  What is the result?()
    A

     Value is: 8

    B

     Compilation fails.

    C

     Value is: 12

    D

     Value is: -12

    E

     The code runs with no output.

    F

     An exception is thrown at runtime.


    正确答案: A
    解析: 暂无解析

  • 第21题:

    单选题
    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: E
    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
    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24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