单选题public class Mycircle {   public double radius;   public double diameter;   public void setRadius(double radius)   this.radius = radius;   this.diameter= radius * 2;   }   public double getRadius() {  return radius;   }   Which statement is true?()A The Mycircle class is fully encapsulated.B The diameter of a given MyCircle is guaranteed to be twice its radius.C Lines 6 and 7 should be in a synchronized block to ensure encapsulation.D The radius of a MyCircle object can be set without affecting its diameter.

单选题
public class Mycircle {   public double radius;   public double diameter;   public void setRadius(double radius)   this.radius = radius;   this.diameter= radius * 2;   }   public double getRadius() {  return radius;   }   Which statement is true?()
A

 The Mycircle class is fully encapsulated.

B

 The diameter of a given MyCircle is guaranteed to be twice its radius.

C

 Lines 6 and 7 should be in a synchronized block to ensure encapsulation.

D

 The radius of a MyCircle object can be set without affecting its diameter.


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Which will declare a method that is available to all members of the same package and can be referenced  without an instance of the class?()  A、 Abstract public void methoda();B、 Public abstract double methoda();C、 Static void methoda(double d1){}D、 Public native double methoda(){}E、 Protected void methoda(double d1){}

Which will declare a method that is available to all members of the same package and be referenced without an instance of the class?()A、 abstract public void methoda ();B、 public abstract double inethoda ();C、 static void methoda (double dl) {}D、 public native double methoda () {}E、 protected void methoda (double dl) {}

class super {   public float getNum() {return 3.0f;}   }   public class Sub extends Super {   }   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; }

Which three demonstrate an “is a” relationship?() A、 public class X { }  public class Y extends X { }B、 public interface Shape { }  public interface Rectangle extends Shape{ }C、 public interface Color { }  public class Shape { private Color color; }D、 public interface Species { }  public class Animal { private Species species; }E、 public class Person { } public class Employee {  public Employee(Person person) { }F、 interface Component { }  class Container implements Component { private Component[] children; }

Which two allow the class Thing to be instantiated using new Thing()?A、 public class Thing { }B、 public class Thing { public Thing() {} }C、 public class Thing { public Thing(void) {} }D、 public class Thing { public Thing(String s) {} }E、 public class Thing { public void Thing() {} public Thing(String s) {} }

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; }

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();  }

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(); }

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; }

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 */ } }

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 */ } }

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; }

单选题class super {   public float getNum() {return 3.0f;}   }   public class Sub extends Super {   }   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; }

单选题下列选项中,能实现对父类的getSalary方法重写的是(  )。class Employee{public double getSalary(){}}Aclass Manager extends Employee{public int getSalary(double x){}}Bclass Manager extends Employee{public double getSalary(int x,int y){}}Cclass Manager extends Employee{public double getSalary(){}}Dclass Manager extends Employee{public int getSalary(int x,int y){}}

单选题Which will declare a method that is available to all members of the same package and can be referenced without an instance of the class?()A Abstract public void methoda();B Public abstract double methoda();C Static void methoda(double d1){}D Public native double methoda()  {}E Protected void methoda(double d1)  {}

单选题Which will declare a method that is available to all members of the same package and be referenced without an instance of the class?()A abstract public void methoda ();B public abstract double inethoda ();C static void methoda (double dl) {}D public native double methoda () {}E protected void methoda (double dl) {}

单选题public class Mycircle {   public double radius;   public double diameter;   public void setRadius(double radius)   this.radius = radius;   this.diameter= radius * 2;   }   public double getRadius() {  return radius;   }   Which statement is true?()A The Mycircle class is fully encapsulated.B The diameter of a given MyCircle is guaranteed to be twice its radius.C Lines 6 and 7 should be in a synchronized block to ensure encapsulation.D The radius of a MyCircle object can be set without affecting its diameter.

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(); }

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();  }