11. public static void append(List list) { list.add(”0042”); }  12. public static void main(String[] args) {  13. List intList = new ArrayList();  14. append(intList);  15. System.out.println(intList.get(0));  16. }  What is the result?() A、 42B、 0042C、 An exception is thrown at runtime.D、 Compilation fails because of an error in line 13.E、 Compilation fails because of an error in line 14.

11. public static void append(List list) { list.add(”0042”); }  12. public static void main(String[] args) {  13. List intList = new ArrayList();  14. append(intList);  15. System.out.println(intList.get(0));  16. }  What is the result?() 

  • A、 42
  • B、 0042
  • C、 An exception is thrown at runtime.
  • D、 Compilation fails because of an error in line 13.
  • E、 Compilation fails because of an error in line 14.

相关考题:

Given:10. interface Data { public void load(); }11. abstract class Info { public abstract void load(); }Which class correctly uses the Data interface and Info class?()() A.B.C.D.E.F.

10. public class ClassA {  11. public void count(int i) {  12. count(++i);  13. }  14. }  And:  20. ClassA a = new ClassA();  21. a.count(3);  Which exception or error should be thrown by the virtual machine?() A、 StackOverflowErrorB、 NullPointerExceptionC、 NumberFormatExceptionD、 IllegalArgumentExceptionE、 ExceptionlnlnitializerError

11. public void addStrings(List list) {  12. list.add(”foo”);  13. list.add(”bar”);  14. }  What must you change in this method to compile without warnings?() A、 add this code after line 11: list = (List) list;B、 change lines 12 and 13 to: list.add(”foo”); list.add(”bar”);C、 change the method signature on line 11 to: public void addStrings(List extends String list) {D、 change the method signature on line 11 to: public void addStrings(List super String list) {E、 No changes are necessary. This method compiles without warnings.

11. public class Counter {  12. public static void main(String[] args) {  13. int numArgs = /* insert code here */;  14. }  15. }  and the command line: java Counter one fred 42 Which code, inserted at line 13, captures the number of arguments passed into the program?() A、 args.countB、 args.lengthC、 args.count()D、 args.length()E、 args.getLength()

10. abstract public class Employee {  11. protected abstract double getSalesAmount();  12. public double getCommision() {  13. return getSalesAmount() * 0.15;  14. }  15. }  16. class Sales extends Employee {  17. // insert method here  18. }  Which two methods, inserted independently at line 17, correctly complete the Sales class?()A、 double getSalesAmount() { return 1230.45; }B、 public double getSalesAmount() { return 1230.45; }C、 private double getSalesAmount() { return 1230.45; }D、 protected double getSalesAmount() { return 1230.45; }

A JavaBeans component has the following field:  11. private boolean enabled;  Which two pairs of method declarations follow the JavaBeans standard for accessing this field?()A、 public void setEnabled( boolean enabled) public boolean getEnabled()B、 public void setEnabled( boolean enabled) public void isEnabled()C、 public void setEnabled( boolean enabled) public boolean isEnabled()D、 public boolean setEnabled( boolean enabled) public boolean getEnabled()

11. public interface Status {  12. /* insert code here */ int MY_VALUE = 10;  13. }  Which three are valid on line 12?()A、 finalB、 staticC、 nativeD、 publicE、 privateF、 abstractG、 protected

10. class Line {  11. public class Point { public int x,y; }  12. public Point getPoint() { return new Point(); }  13. }  14. class Triangle {  15. public Triangle() {  16. // insert code here  17. }  18. }  Which code, inserted at line 16, correctly retrieves a local instance of a Point object?() A、 Point p = Line.getPoint();B、 Line.Point p = Line.getPoint();C、 Point p = (new Line()).getPoint();D、 Line.Point p = (new Line()).getPoint();

多选题Given:   11. // insert code here   12. private N min, max;   13. public N getMin() { return min; }   14. public N getMax() { return max; }   15. public void add(N added) {   16. if (min == null || added.doubleValue()  max.doubleValue())  19. max = added;   20. }   21. }   Which two, inserted at line 11, will allow the code to compile?()AABBCCDDEEFF

单选题11. class Animal { public String noise() { return “peep”; } }  12. class Dog extends Animal {  13. public String noise() { return “bark”; }  14. }  15. class Cat extends Animal {  16. public String noise() { return “meow”; }  17. }  .....  30. Animal animal = new Dog();  31. Cat cat = (Cat)animal;  32. System.out.printIn(cat.noise());  What is the result?()A peepB barkC meowD Compilation fails.E An exception is thrown at runtime.

单选题10. interface Foo { int bar(); }  11. public class Sprite {  12. public int fubar( Foo foo) { return foo.bar(); }  13. public void testFoo() {  14. fubar(  15. // insert code here  16.);  17. }  18. }  Which code, inserted at line 15, allows the class Sprite to compile?()A Foo { public int bar() { return 1; } }B new Foo { public int bar() { return 1; } }C newFoo() { public int bar(){return 1; } }D new class Foo { public int bar() { return 1; } }

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: 8B Compilation fails.C Value is: 12D Value is: -12E The code runs with no output.F An exception is thrown at runtime.

多选题A JavaBeans component has the following field:  11. private boolean enabled;  Which two pairs of method declarations follow the JavaBeans standard for accessing this field?()Apublic void setEnabled( boolean enabled) public boolean getEnabled()Bpublic void setEnabled( boolean enabled) public void isEnabled()Cpublic void setEnabled( boolean enabled) public boolean isEnabled()Dpublic boolean setEnabled( boolean enabled) public boolean getEnabled()

单选题10. class Line {  11. public class Point { public int x,y; }  12. public Point getPoint() { return new Point(); }  13. }  14. class Triangle {  15. public Triangle() {  16. // insert code here  17. }  18. }  Which code, inserted at line 16, correctly retrieves a local instance of a Point object?()A Point p = Line.getPoint();B Line.Point p = Line.getPoint();C Point p = (new Line()).getPoint();D Line.Point p = (new Line()).getPoint();

单选题1. interface A { public void aMethod(); }  2. interface B { public void bMethod(); }  3. interface C extends A,B { public void cMethod(); }  4. class D implements B {  5. public void bMethod() { }  6. }  7. class E extends D implements C {  8. public void aMethod() { }  9. public void bMethod() { }  10. public void cMethod() { }  11. }  What is the result?()A Compilation fails because of an error in line 3.B Compilation fails because of an error in line 7.C Compilation fails because of an error in line 9.D If you define D e = new E(), then e.bMethod() invokes the version of bMethod()defined in Line 5.E If you define D e = (D)(new E()),then e.bMethod() invokes the version of bMethod() defined in Line 5.F If you define D e = (D)(new E()), then e.bMethod() invokes the version of bMethod() defined in Line 9.

单选题10. public class ClassA {  11. public void count(int i) {  12. count(++i);  13. }  14. }  And:  20. ClassA a = new ClassA();  21. a.count(3);  Which exception or error should be thrown by the virtual machine?()A StackOverflowErrorB NullPointerExceptionC NumberFormatExceptionD IllegalArgumentExceptionE ExceptionlnlnitializerError

单选题1. public class test (  2. public static void main(string args[]) {  3. int 1= 0;  4. while (i)  {  5. if (i==4) {  6. break;  7. }  8. ++i;  9. }  10.    11. }  12. )   What is the value of i at line 10?()A 0B 3C 4D 5E The code will not compile.

多选题1. class Super {  2. private int a;  3. protected Super(int a) { this.a = a; }  4. }  .....  11. class Sub extends Super {  12. public Sub(int a) { super(a); }  13. public Sub() { this.a= 5; }  14. }  Which two, independently, will allow Sub to compile?()AChange line 2 to: public int a;BChange line 2 to: protected int a;CChange line 13 to: public Sub() { this(5); }DChange line 13 to: public Sub() { super(5); }EChange line 13 to: public Sub() { super(a); }

单选题10. public class ClassA {  11. public void methodA() {  12. ClassB classB = new ClassB();  13. classB.getValue();  14. }  15. }  And:  20. class ClassB {  21. public ClassC classC;  22.  23. public String getValue() {  24. return classC.getValue();  25. }  26. }  And:  30. class ClassC {  31. public String value;  32.  33. public String getValue() {  34. value = “ClassB”;  35. return value;  36. }  37. }  Given:  ClassA a = new ClassA();  a.methodA();  What is the result?()A Compilation fails.B ClassC is displayed.C The code runs with no output.D An exception is thrown at runtime.

单选题10. class Nav{  11. public enum Direction { NORTH, SOUTH, EAST, WEST }  12. }  13. public class Sprite{  14. // insert code here  15. }  Which code, inserted at line 14, allows the Sprite class to compile?()A Direction d = NORTH;B Nav.Direction d = NORTH;C Direction d = Direction.NORTH;D Nav.Direction d = Nav.Direction.NORTH;

单选题11. public class Test {  12. public void foo() {  13. assert false;  14. assert false;  15. }  16. public void bar(){  17. while(true){  18. assert false;  19. }  20. assert false;  21. }  22. }  What causes compilation to fail?()A Line 13B Line 14C Line 18D Line 20

多选题Given an EL function declared with:11.  12.spin 13.com.example.Spinner 14. 15.java.lang.String spinIt() 16. 17. Which two are true?()AThe function method must have the signature: public String spin().BThe method must be mapped to the logical name spin in the web.xml file.CThe function method must have the signature: public String spinIt().DThe function method must have the signature public static String spin().EThe function method must have the signature: public static String spinIt().FThe function class must be named Spinner, and must be in the package com.example.

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 ToppingsC The code runs with no output.D A NullPointerException is thrown in Line 4.

多选题11. public interface Status {  12. /* insert code here */ int MY_VALUE = 10;  13. }  Which three are valid on line 12?()AfinalBstaticCnativeDpublicEprivateFabstractGprotected