单选题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 Cla

题目
单选题
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.


相似考题
参考答案和解析
正确答案: C
解析: 暂无解析
更多“单选题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 Cla”相关问题
  • 第1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

    正确答案:A,D

  • 第2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.

    正确答案:B

  • 第3题:

    现有:   1. class Synapse {    2.    protected int gap() { return 7; }    3. }   4.     5. class Creb extends Synapse {    6.   // insert code here   7. }    分别插入到第 6 行,哪三行可以编译?()

    • A、 int gap() { return 7; }
    • B、 public int gap() { return 7; }
    • C、 private int gap(int x) { return 7; }
    • D、 protected Creb gap() { return this; }
    • E、 public int gap() { return Integer.getInteger ("42"); }

    正确答案:B,C,E

  • 第4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5题:

    ClassOne.java   package com.abc.pkg1;   public class ClassOne {   private char var = ‘a‘;   char getVar() {return var;}   }   ClassTest.java   package com.abc.pkg2;   import com.abc.pkg1.ClassOne;   public class ClassTest extends ClassOne {  public static void main(Stringargs) {  char a = new ClassOne().getVar();  char b = new ClassTest().getVar();   }   }   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.

    正确答案:B

  • 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 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8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9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; }


    正确答案: A
    解析: 暂无解析

  • 第10题:

    单选题
    ClassOne.java   package com.abc.pkg1;   public class ClassOne {   private char var = ‘a‘;   char getVar() {return var;}   }   ClassTest.java   package com.abc.pkg2;   import com.abc.pkg1.ClassOne;   public class ClassTest extends ClassOne {  public static void main(Stringargs) {  char a = new ClassOne().getVar();  char b = new ClassTest().getVar();   }   }   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.


    正确答案: B
    解析: 暂无解析

  • 第11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12题:

    单选题
    1. public class Target {  2. private int i = 0;  3. public int addOne() {  4. return ++i;  5. }  6. }  And:  1. public class Client {  2. public static void main(String[] args) {  3. System.out.println(new Target().addOne());  4. }  5. }  Which change can you make to Target without affecting Client?()
    A

     Line 4 of class Target can be changed to return i++;

    B

     Line 2 of class Target can be changed to private int i = 1;

    C

     Line 3 of class Target can be changed to private int addOne() {

    D

     Line 2 of class Target can be changed to private Integer i = 0;


    正确答案: C
    解析: 暂无解析

  • 第13题:

    Given:  1. public class Method Over {  2. public void set Var (int a, int b, float c) {  3. }  4. }   Which two overload the set Var method()?

    • A、 private void set Var(int a, float c, int b) {}
    • B、 protected void set Var(int a, int b, float c) {}
    • C、 public int set Var(int a, float c, int b) {return a:}
    • D、 public int set Var(int a, int b, float c) {return a:}
    • E、 protected float set Var(int a, int b, float c) {return c:}

    正确答案:A,C

  • 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:

    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:A

  • 第16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; }

    正确答案:B

  • 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:

    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.

    正确答案:B

  • 第19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20题:

    单选题
    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.


    正确答案: D
    解析: 暂无解析

  • 第21题:

    多选题
    1. class BaseClass {  2. private float x = 1.of;  3. protected float getVar() { return x; }  4. }  5. class SubClass extends BaseClass {  6. private float x = 2.Of;  7. // insert code here 8. }   Which two are valid examples of method overriding when inserted at line 7?()
    A

    float getVar() { return x; }

    B

    public float getVar() { return x; }

    C

    public double getVar() { return x; }

    D

    protected float getVar() { return x; }

    E

    public float getVar(float f) { return f; }


    正确答案: E,A
    解析: 暂无解析

  • 第22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23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24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 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; }


    正确答案: C
    解析: 暂无解析