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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A. An inner class may be declared as static.
B. An anonymous inner class can be declared as public.
C. An anonymous inner class can be declared as private.
D. An anonymous inner class can extend an abstract class.
E. An anonymous inner class can be declared as protected.
AnInterface is an interface.
AnAdapter0 is a non-abstract， non-final class with a zero argument constructor.
AnAdapter1 is a non-abstract， non-final class without a zero argument constructor， but with a constructor that takes one int argument.
Which two construct an anonymous inner class？ （）
A. AnAdapter1 aa=new AnAdapter1（）{}
B.AnAdapter0 aa=new AnAdapter0（）{}
C. AnAdapter0 aa=new AnAdapter0（5）{}
D. AnAdapter1 aa=new AnAdapter1（5）{}
E.AnInterface a1=new AnInterface（5）{}
class A {
public byte getNumber （） {
return 1；
}
}
class B extends A {
public short getNumber（） {
return 2；
}
public static void main （String args） {
B b = new B （）；
System.out.printIn（b.getNumber（））
}
}
What is the result？（）
A. Compilation succeeds and 1 is printed.
B. Compilation succeeds and 2 is printed.
C. An error at line 8 causes compilation to fail.
D. An error at line 14 causes compilation to fail.
E. Compilation succeeds but an exception is thrown at line 14.
A. An anonymous class can be declared as static.
B. A static inner class cannot be a static member of the outer class.
C. A static inner class does not require an instance of the enclosing class.
D. Instance members of a static inner class can be referenced using the class name of the static inner class.
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； }
class A {
public int getNumber（int a） {
return a + 1；
}
}
class B extends A {
public int getNumber （int a） {
return a + 2
}
public static void main （String args） {
A a = new B（）；
System.out.printIn（a.getNumber（0））；
}
}
What is the result？ （）
A. Compilation succeeds and 1 is printed.
B. Compilation succeeds and 2 is printed.
C. An error at line 8 causes compilation to fail.
D. An error at line 13 causes compilation to fail.
E. An error at line 14 causes compilation to fail.
import java.awt.*；
public class Test extends Frame {
public Test（） {
add（new Label（“Hello”） ）；
add（new TextField（“Hello”） ）；
add（new Button（“Hello”） ）；
pack（）；
show（）；
}
public static void main（String args） {
new Test （）；
}
}
What is the result？ （）
A. The code will not compile.
B. A Window will appear containing only a Button.
C. An IllegalArgumentException is thrown at line 6.
D. A Window button will appear but will not contain the Label， TextField， or Button.
E. A Window will appear containing a Label at the top， a TextField below the Label， and a Button below the TextField.
F. A Window will appear containing a Label on the left， a TextField to the right of the Label， and a button to the right of the TextField.
A. Public class getClass（）
B. Public Object getSource（）
C. Public Component getSource（）
D. Public Component getTarget（）
E. Public Component getComponent（）
F. Public Component getTargetComponent（）
A. A flow layout can be used to position a component that should resize horizontally when the container is resized.
B. A grid layout can be used to position a component tat should maintain a constant size even when the container is resized.
C. A border layout can be used to position component that should maintain a constant size even when the container is resized.
D. The grid bag layout can be used to give a grid-like layout which differs from the normal grid in that individual rows and columns can have unique sizes.
E. If two components are placed in the same column of a grid bag layout， and one component resizes horizontally， then the other component must resize horizontally.
A. Int foo = （int） Math.max（bar）；
B. Int foo = （int） Math.min（bar）；
C. Int foo = （int） Math.abs（bar）；
D. Int foo = （int） Math.ceil（bar）；
E. Int foo = （int） Math.floor（bar）；
F. Int foo = （int） Math.round（bar）；
最新试题
Given a class whose instances， when found in a collection of objects， are sorted by using the compareTo（） method， which two statements are true？（）
Which two changes， taken together， would guarantee the output： 1， 2， 3， 4， 5？（）
Given： foo and bar are public references available to many other threads， foo refers to a Thread and bar is an Object. The thread foo is currently executing bar.wait（）. From another thread， what provides the most reliable way to ensure that foo will stop executing wait（）？（）
Which statement is true about the set variable on line 12？（）
What is the result？（）
Given that t1 is a reference to a live thread， which is true？（）
Which statement is true？（）
Which code， inserted at line 4， guarantees that this program will output [1， 2]？（）
Which statement is true？（）
What is the result？（）