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多选题
Given a file GrizzlyBear.java:  1. package animals.mammals;  2.  3. public class GrizzlyBear extends Bear {  4. void hunt() {  5. Salmon s = findSalmon();  6. s.consume();  7. }  8. }  and another file, Salmon.java:  1. package animals.fish; 2.  3. public class Salmon extends Fish {  4. void consume() { /* do stuff */ }  5. }  Assume both classes are defined in the correct directories for theft packages, and that the Mammal class correctly defines the findSalmon() method. Which two changes allow this code to compile correctly?()
A

add public to the start of line 4 in Salmon.java

B

add public to the start of line 4 in GrizzlyBear.java

C

add import animals.mammals.*; at line 2 in Salmon.java

D

add import animals.fish.*; at line 2 in GrizzlyBear.java

E

add import animals.fish.Salmon.*; at line 2 in GrizzlyBear.java

F

add import animals.mammals.GrizzlyBear.*;at line 2 in Salmon.java


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更多 “多选题Given a file GrizzlyBear.java:  1. package animals.mammals;  2.  3. public class GrizzlyBear extends Bear {  4. void hunt() {  5. Salmon s = findSalmon();  6. s.consume();  7. }  8. }  and another file, Salmon.java:  1. package animals.fish; 2.  3. public class Salmon extends Fish {  4. void consume() { /* do stuff */ }  5. }  Assume both classes are defined in the correct directories for theft packages, and that the Mammal class correctly defines the findSalmon() method. Which two changes allow this code to compile correctly?()Aadd public to the start of line 4 in Salmon.javaBadd public to the start of line 4 in GrizzlyBear.javaCadd import animals.mammals.*; at line 2 in Salmon.javaDadd import animals.fish.*; at line 2 in GrizzlyBear.javaEadd import animals.fish.Salmon.*; at line 2 in GrizzlyBear.javaFadd import animals.mammals.GrizzlyBear.*;at line 2 in Salmon.java” 相关考题
考题 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.

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考题 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.

考题 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.

考题 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 AB、 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.

考题 Given a file GrizzlyBear.java:  1. package animals.mammals;  2.  3. public class GrizzlyBear extends Bear {  4. void hunt() {  5. Salmon s = findSalmon();  6. s.consume();  7. }  8. }  and another file, Salmon.java:  1. package animals.fish; 2.  3. public class Salmon extends Fish {  4. void consume() { /* do stuff */ }  5. }  Assume both classes are defined in the correct directories for theft packages, and that the Mammal class correctly defines the findSalmon() method. Which two changes allow this code to compile correctly?()A、 add public to the start of line 4 in Salmon.javaB、 add public to the start of line 4 in GrizzlyBear.javaC、 add import animals.mammals.*; at line 2 in Salmon.javaD、 add import animals.fish.*; at line 2 in GrizzlyBear.javaE、 add import animals.fish.Salmon.*; at line 2 in GrizzlyBear.javaF、 add import animals.mammals.GrizzlyBear.*;at line 2 in Salmon.java

考题 1. class SuperClass {  2. public a geta() {  3. return new a();  4. }  5. }  6. class SubClass extends SuperClass {  7. public b geta() {  8. return new b();  9. }  10. }  Which is true?() A、 Compilation will succeed if a extends b.B、 Compilation will succeed if b extends a.C、 Compilation will always fail because of an error in line 7.D、 Compilation will always fail because of an error in line 8.

考题 1. public class Exception Test {  2. class TestException extends Exception {}  3. public void runTest() throws TestException {}  4. public void test() /* Point X */ {  5. runTest();  6. }  7. }  At Point X on line 4, which code is necessary to make the code compile?()  A、 No code is necessary.B、 throws ExceptionC、 catch ( Exception e )D、 throws RuntimeExceptionE、 catch ( TestException e)

考题 1. package foo;  2.    3. import java.util.Vector;  4.    5. private class MyVector extends Vector {  6. int i = 1;  7. public MyVector()  {  8. i = 2;  9.    }  10. }  11.    12. public class MyNewVector extends MyVector {  13. public MyNewVector ()  {  14. i = 4;  15. }  16. public static void main (String args [])  {  17. MyVector v = new MyNewVector();  18.   }  19. }     The file MyNewVector.java is shown in the exhibit.  What is the result?()  A、 Compilation will succeed.B、 Compilation will fail at line 5.C、 Compilation will fail at line 6.D、 Compilation will fail at line 14.E、 Compilation will fail at line 17.

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考题 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.

考题 GivenafileGrizzlyBear.java: 1.package animals.mammals; 2. 3.public class GrizzlyBear extends Bear{ 4.voidhunt(){ 5.Salmons=findSalmon(); 6.s.consume(); 7.} 8.} and another file,Salmon.java: 1.packageanimals.fish; 2. 3.public class Salmon extends Fish{ 4.voidconsume(){/*dostuff*/} 5.} Assume both classes are defined in the correct directories for theft packages,and that the Mammal class correctly defines the findSalmon()method.Which two changes allow this code to compile correctly?()A、add public to the start of line 4 in Salmon.javaB、add public to the start of line 4 in GrizzlyBear.javaC、add import animals.mammals.*;at line 2 in Salmon.javaD、add import animals.fish.*at line 2 in GrizzlyBear.javaE、add import animals.fish.Salmon.*;at line 2 in GrizzlyBear.javaF、add import animals.mammals.GrizzlyBear.*;at line 2 in Salmon.java

考题 1. class super {  2. public float getNum() {return 3.0f;}  3. }  4.    5. public class Sub extends Super { 6.   7. }   Which method, placed at line 6, will cause a compiler error?()  A、  Public float getNum()   {return 4.0f; }B、  Public void getNum ()  { }C、  Public void getNum (double d)   { }D、  Public double getNum (float d) {retrun 4.0f; }

考题 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.

考题 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);

考题 ClassOne.java  1. package com.abc.pkg1;  2. public class ClassOne {  3. private char var = ‘a’;   4. char getVar()  {return var;}  5. }  ClassTest.java    1. package com.abc.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 will fail.B、 Compilation succeeds and no exceptions are thrown.C、 Compilation succeeds but an exception is thrown at line 5 in ClassTest.java.D、 Compilation succeeds but an exception is thrown at line 6 in ClassTest.java.

考题 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;

考题 现有:   1. interface Animal {    2.   void eat();   3.  }    4.   5. // insert code here    6.   7. public class HouseCat implements Feline {    8.   public void eat() { }   9. }   和以下三个接口声明:   interface Feline extends Animal { }    interface Feline extends Animal { void eat(); }     interface Feline extends Animal { void eat() { } }    分别插入到第 5 行,有多少行可以编译?()  A、 0B、 1C、 2D、 3

考题 多选题GivenafileGrizzlyBear.java: 1.package animals.mammals; 2. 3.public class GrizzlyBear extends Bear{ 4.voidhunt(){ 5.Salmons=findSalmon(); 6.s.consume(); 7.} 8.} and another file,Salmon.java: 1.packageanimals.fish; 2. 3.public class Salmon extends Fish{ 4.voidconsume(){/*dostuff*/} 5.} Assume both classes are defined in the correct directories for theft packages,and that the Mammal class correctly defines the findSalmon()method.Which two changes allow this code to compile correctly?()Aadd public to the start of line 4 in Salmon.javaBadd public to the start of line 4 in GrizzlyBear.javaCadd import animals.mammals.*;at line 2 in Salmon.javaDadd import animals.fish.*at line 2 in GrizzlyBear.javaEadd import animals.fish.Salmon.*;at line 2 in GrizzlyBear.javaFadd import animals.mammals.GrizzlyBear.*;at line 2 in Salmon.java

考题 单选题1. public class Exception Test {  2. class TestException extends Exception {}  3. public void runTest() throws TestException {}  4. public void test() /* Point X */ {  5. runTest();  6. }  7. }  At Point X on line 4, which code is necessary to make the code compile?()A  No code is necessary.B  throws ExceptionC  catch ( Exception e )D  throws RuntimeExceptionE  catch ( TestException e)

考题 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.

考题 单选题1. class SuperClass {  2. public a geta() {  3. return new a();  4. }  5. }  6. class SubClass extends SuperClass {  7. public b geta() {  8. return new b();  9. }  10. }  Which is true?()A  Compilation will succeed if a extends b.B  Compilation will succeed if b extends a.C  Compilation will always fail because of an error in line 7.D  Compilation will always fail because of an error in line 8.

考题 单选题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.

考题 单选题1. class Super {  2. public float getNum() { return 3.0f; }  3. }  4.   5. public class Sub extends Super {  6.   7. }  Which method, placed at line6, causes compilation to fail?()A  public void getNum(){}B  public void getNum(double d){}C  public float getNum() { return 4.0f; }D  public double getNum(float d) { return 4.0d; }

考题 多选题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?()AThe application will crash.BThe code on line 29 will be executed.CThe code on line 5 of class A will execute.DThe code on line 5 of class B will execute.EThe exception will be propagated back to line 27.

考题 单选题现有:   1. interface Animal {    2.   void eat();   3.  }    4.   5. // insert code here    6.   7. public class HouseCat implements Feline {    8.   public void eat() { }   9. }   和以下三个接口声明:   interface Feline extends Animal { }    interface Feline extends Animal { void eat(); }     interface Feline extends Animal { void eat() { } }    分别插入到第 5 行,有多少行可以编译?()A  0B  1C  2D  3

考题 多选题Given a file GrizzlyBear.java:  1. package animals.mammals;  2.  3. public class GrizzlyBear extends Bear {  4. void hunt() {  5. Salmon s = findSalmon();  6. s.consume();  7. }  8. }  and another file, Salmon.java:  1. package animals.fish; 2.  3. public class Salmon extends Fish {  4. void consume() { /* do stuff */ }  5. }  Assume both classes are defined in the correct directories for theft packages, and that the Mammal class correctly defines the findSalmon() method. Which two changes allow this code to compile correctly?()Aadd public to the start of line 4 in Salmon.javaBadd public to the start of line 4 in GrizzlyBear.javaCadd import animals.mammals.*; at line 2 in Salmon.javaDadd import animals.fish.*; at line 2 in GrizzlyBear.javaEadd import animals.fish.Salmon.*; at line 2 in GrizzlyBear.javaFadd import animals.mammals.GrizzlyBear.*;at line 2 in Salmon.java

考题 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 AB  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.