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单选题
1. abstract class AbstractIt {  2. abstract float getFloat();  3. }  4. public class AbstractTest extends AbstractIt {  5. private float f1 = 1.0f;  6. private float getFloat() { return f1; }  7. }  What is the result?()
A

 Compilation succeeds.

B

 An exception is thrown.

C

 Compilation fails because of an error at line 2.

D

 Compilation fails because of an error at line 6.


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更多 “单选题1. abstract class AbstractIt {  2. abstract float getFloat();  3. }  4. public class AbstractTest extends AbstractIt {  5. private float f1 = 1.0f;  6. private float getFloat() { return f1; }  7. }  What is the result?()A  Compilation succeeds.B  An exception is thrown.C  Compilation fails because of an error at line 2.D  Compilation fails because of an error at line 6.” 相关考题
考题 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; }

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 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 1. interface DoStuff2 {  2. float getRange(int low, int high); }  3.  4. interface DoMore {  5. float getAvg(int a, int b, int c); }  6.  7. abstract class DoAbstract implements DoStuff2, DoMore { }  8.  9. class DoStuff implements DoStuff2 {  10. public float getRange(int x, int y) { return 3.14f; } }  11.  12. interface DoAll extends DoMore {  13. float getAvg(int a, int b, int c, int d); }  What is the result?() A、 The file will compile without error.B、 Compilation fails. Only line 7 contains an error.C、 Compilation fails. Only line 12 contains an error.D、 Compilation fails. Only line 13 contains an error.E、 Compilation fails. Only lines 7 and 12 contain errors.F、 Compilation fails. Only lines 7 and 13 contain errors.G、 Compilation fails. Lines 7, 12, and 13 contain errors.

考题 1. abstract class AbstractIt {  2. abstract float getFloat();  3. }  4. public class AbstractTest extends AbstractIt {  5. private float f1 = 1.0f;  6. private float getFloat() { return f1; }  7. }  What is the result?() A、 Compilation succeeds.B、 An exception is thrown.C、 Compilation fails because of an error at line 2.D、 Compilation fails because of an error at line 6.

考题 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:}

考题 abstract class abstrctIt {   abstract float getFloat ();   }   public class AbstractTest extends AbstractIt {   private float f1= 1.0f;   private float getFloat () {return f1;}   }   What is the result? ()A、 Compilation is successful.B、 An error on line 6 causes a runtime failure.C、 An error at line 6 causes compilation to fail.D、 An error at line 2 causes compilation to fail.

考题 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、  0B、  1C、  2D、  3

考题 class BaseClass{  private float x= 1.0f;  protected void setVar (float f) {x = f;}  }  class SubClass extends BaseClass   {  private float x = 2.0f;  //insert code here  }   Which two are valid examples of method overriding?()        A、 Void setVar(float f) {x = f;}B、 Public void setVar(int f) {x = f;}C、 Public void setVar(float f) {x = f;}D、 Public double setVar(float f) {x = f;}E、 Public final void setVar(float f) {x = f;}F、 Protected float setVar() {x=3.0f; return 3.0f; }

考题 class BaseClass{   private float x= 1.0f;   protected void setVar (float f) {x = f;}   }   class SubClass exyends BaseClass {   private float x = 2.0f;   //insert code here  8. }   Which two are valid examples of method overriding?()A、 Void setVar(float f) {x = f;}B、 Public void setVar(int f) {x = f;}C、 Public void setVar(float f) {x = f;}D、 Public double setVar(float f) {x = f;}E、 Public final void setVar(float f) {x = f;}F、 Protected float setVar() {x=3.0f; return 3.0f; }

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 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、0B、1C、2D、3

考题 现有:  1. abstract class Color  {  2.protected abstract  String getRGB();     3.  }     4.  5. public class Blue extends Color  {     6.    //insert code here      7.  }  和四个声明:  public String getRGB()  {  return "blue";  }      String getRGB()  {  return  "blue";  )  private  String getRGB()  {  return  "blue";  }      protected String getRGB()  {  return "blue";  )      分别插入到第6行,有几个可以通过编译?()    A、  0B、  1C、  2D、  3

考题 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(); }

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 1. public class ArrayTest {  2. public static void main (String[]args)  {  3. float f1[], f2[];  4. f1 = new float [10];  5. f2 = f1;  6. System.out.printIn (“f2[0]=” + f2[0]);  7.  }  8. }   What is the result?()  A、 It prints f2[0] = 0.0B、 It prints f2[0] = NaNC、 An error at line 5 causes compile to fail.D、 An error at line 6 causes compile to fail.E、 An error at line 6 causes an exception at runtime.

考题 单选题1. interface DoStuff2 {  2. float getRange(int low, int high); }  3.  4. interface DoMore {  5. float getAvg(int a, int b, int c); }  6.  7. abstract class DoAbstract implements DoStuff2, DoMore { }  8.  9. class DoStuff implements DoStuff2 {  10. public float getRange(int x, int y) { return 3.14f; } }  11.  12. interface DoAll extends DoMore {  13. float getAvg(int a, int b, int c, int d); }  What is the result?()A  The file will compile without error.B  Compilation fails. Only line 7 contains an error.C  Compilation fails. Only line 12 contains an error.D  Compilation fails. Only line 13 contains an error.E  Compilation fails. Only lines 7 and 12 contain errors.F  Compilation fails. Only lines 7 and 13 contain errors.G  Compilation fails. Lines 7, 12, and 13 contain errors.

考题 单选题abstract class abstrctIt {  abstract float getFloat ();  } public class AbstractTest extends AbstractIt { private float f1= 1.0f;  private float getFloat () {return f1;}  }   What is the result?()A  Compilation is successful.B  An error on line 6 causes a runtime failure.C  An error at line 6 causes compilation to fail.D  An error at line 2 causes compilation to fail.

考题 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.

考题 单选题1. abstract class AbstractIt {  2. abstract float getFloat();  3. }  4. public class AbstractTest extends AbstractIt {  5. private float f1 = 1.0f;  6. private float getFloat() { return f1; }  7. }  What is the result?()A  Compilation succeeds.B  An exception is thrown.C  Compilation fails because of an error at line 2.D  Compilation fails because of an error at line 6.

考题 单选题现有:  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   0B   1C   2D   3

考题 单选题1. public class ArrayTest {  2. public static void main (String[]args)  {  3. float f1[], f2[];  4. f1 = new float [10];  5. f2 = f1;  6. System.out.printIn (“f2[0]=” + f2[0]);  7.  }  8. }   What is the result?()A  It prints f2[0] = 0.0B  It prints f2[0] = NaNC  An error at line 5 causes compile to fail.D  An error at line 6 causes compile to fail.E  An error at line 6 causes an exception at runtime.

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 单选题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 0B 1C 2D 3

考题 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?()Afloat getVar() { return x; }Bpublic float getVar() { return x; }Cpublic double getVar() { return x; }Dprotected float getVar() { return x; }Epublic float getVar(float f) { return f; }

考题 单选题现有:  1. interface Animal {  2. void eat();  3. }  4.  5. // insert code here  6.  7. public class HouseCat extends Feline {  8. public void eat() { }  9. }   和五个声明:  abstract class Feline implements Animal { }  abstract class Feline implements Animal { void eat(); }  abstract class Feline implements Animal { public void eat(); }  abstract class Feline implements Animal { public void eat() { } }  abstract class Feline implements Animal { abstract public void eat(); }  分别插入到第5行,有几个可以通过编译?()A 0B 1C 2D 3

考题 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.

考题 单选题现有:  1. abstract class Color  {  2.protected abstract  String getRGB();     3.  }     4.  5. public class Blue extends Color  {     6.    //insert code here      7.  }  和四个声明:  public String getRGB()  {  return "blue";  }      String getRGB()  {  return  "blue";  )  private  String getRGB()  {  return  "blue";  }      protected String getRGB()  {  return "blue";  )      分别插入到第6行,有几个可以通过编译?()A   0B   1C   2D   3

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 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; }