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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

  0

B

  1

C

  2

D

  3


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更多 “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” 相关考题
考题 下列哪个类声明是正确的?A.abstract class G2 extends superClassl,superClass2{……}B.abstract public class classmates{……}C.public final class NewClass extends superClass implements Interfacel{……}D.public abstract class String{……}

考题 阅读下面代码 abstract class Person { public Person(String n) { name=n; } public______String getDescription(); public String getName() { return name; } private String name; } 在下画线处应填入的修饰符是A.staticB.abstractC.protectedD.final

考题 Java代码查错1.abstract class Name {private String name;public abstract boolean isStupidName(String name) {}}大侠们,这有何错误?

考题 下列哪个类声明是正确的? ( )A.abstract class G2 extends superClass1,superClass2{...}B.abstract public class classmates{...}C.public final class NewClass extends superClass implemnets Interface1{...}D.public abstract class String{...}

考题 为使下列代码正常运行,应该在下画线处填入的选项是( )。 abstract class person{ public Person(String n){ name=n: } Public String getDescription; public String getName{ return name; } private string name; }A.staticB.privateC.abstractD.final

考题 下列哪个类声明是正确的? ( )A.abstract class G2 extends superClass1, superClass2 {…}B.abstract public class classmates{…}C.public final class NewClass extends superClass implemnets Interfacel{…}D.public abstract class String{…}

考题 1. public class Employee {  2. String name;  3. double baseSalary;  4. Employee(String name, double baseSalary) {  5. this.name = name;  6. this.baseSalary = baseSalary;  7. }  8. }  And:  1. public class Salesperson extends Employee { 2. double commission;  3. public Salesperson(String name, double baseSalary,  4. double commission) {  5. // insert code here  6. } 7. }  Which code, inserted at line 7, completes the Salesperson constructor?() A、 this.commission = commission;B、 superb(); commission = commission;C、 this.commission = commission; superb();D、 super(name, baseSalary); this.commission = commission;E、 super(); this.commission = commission;F、 this.commission = commission; super(name, baseSalary);

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 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 public class OuterClass {   private double d1 1.0;   //insert code here   }   You need to insert an inner class declaration at line2. Which two inner class declarations are valid?()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 现有:  interface Animal {       void eat () ;       }       //insert code here       public class HouseCat extends Feline {       public void eat() { }       }  和五个申明  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();} 结果为:()      A、1B、2C、3D、4

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 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 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 public abstract class Shape {  private int x;  private int y;  public abstract void draw();  public void setAnchor(int x, int y) {  this.x = x;  this.y = y;  }  }  Which two classes use the Shape class correctly?()A、 public class Circle implements Shape { private int radius; }B、 public abstract class Circle extends Shape { private int radius; }C、 public class Circle extends Shape { private int radius; public void draw(); }D、 public abstract class Circle implements Shape { private int radius; public void draw(); }E、 public class Circle extends Shape { private int radius;public void draw() {/* code here */} }F、 public abstract class Circle implements Shape { private int radius;public void draw() { / code here */ } }

考题 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.

考题 多选题public class OuterClass {  private double d1  1.0;  //insert code here   }   You need to insert an inner class declaration at line2. Which two inner class declarations are valid?()Astatic class InnerOne {  public double methoda() {return d1;}  }Bstatic class InnerOne {  static double methoda() {return d1;} }Cprivate class InnerOne {  public double methoda() {return d1;} }Dprotected class InnerOne {  static double methoda() {return d1;} }Epublic abstract class InnerOne {  public abstract double methoda();  }

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. public class OuterClass {  2. private double d1 = 1.0;  3. // insert code here  4. }  Which two are valid if inserted at line 3?()Astatic class InnerOne { public double methoda() { return d1; } }Bstatic class InnerOne { static double methoda() { return d1; } }Cprivate class InnerOne { public double methoda() { return d1; } }Dprotected class InnerOne { static double methoda() { return d1; } }Epublic abstract class InnerOne { public abstract double methoda(); }

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 多选题public abstract class Shape {  private int x;  private int y;  public abstract void draw();  public void setAnchor(int x, int y) {  this.x = x;  this.y = y;  }  }  Which two classes use the Shape class correctly?()Apublic class Circle implements Shape { private int radius; }Bpublic abstract class Circle extends Shape { private int radius; }Cpublic class Circle extends Shape { private int radius; public void draw(); }Dpublic abstract class Circle implements Shape { private int radius; public void draw(); }Epublic class Circle extends Shape { private int radius;public void draw() {/* code here */} }Fpublic abstract class Circle implements Shape { private int radius;public void draw() { / code here */ } }

考题 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;

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. public class Employee {  2. String name;  3. double baseSalary;  4. Employee(String name, double baseSalary) {  5. this.name = name;  6. this.baseSalary = baseSalary;  7. }  8. }  And:  1. public class Salesperson extends Employee { 2. double commission;  3. public Salesperson(String name, double baseSalary,  4. double commission) {  5. // insert code here  6. } 7. }  Which code, inserted at line 7, completes the Salesperson constructor?()A  this.commission = commission;B  superb(); commission = commission;C  this.commission = commission; superb();D  super(name, baseSalary); this.commission = commission;E  super(); this.commission = commission;F  this.commission = commission; super(name, baseSalary);

考题 单选题现有:  interface Animal {       void eat () ;       }       //insert code here       public class HouseCat extends Feline {       public void eat() { }       }  和五个申明  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();} 结果为:()A 1B 2C 3D 4