Which statements are&#8194...

多项选择题Which statements are true concerning the effect of the >> and >>> operators?（）

A.For non-negative values of the left operand， the >> and >>> operators will have the same effect.
B.The result of （-1 >> 1） is 0.
C.The result of （-1 >>> 1） is -1.
D.The value returned by >>> will never be negative as long as the value of the right operand is equal to or greater than 1.
E.When using the >> operator， the leftmost bit of the bit representation of the resulting value will always be the same bit value as the leftmost bit of the bit representation of the left operand.

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1.多项选择题 Given the following class， which statements can be inserted at position 1 without causing the code to fail compilation？（）
public class Q6db8 {
int a；
int b = 0；
static int c；
public void m（） {
int d；
int e = 0；
// Position 1
}
}

A.a++；
B.b++；
C.c++；
D.d++；
E.e++；

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2.单项选择题 If this source code is contained in a file called SmallProg.java， what command should be used to compile it using the JDK？（）
public class SmallProg {
public static void main（String args[]）
{ System.out.println（"Good luck!"）； } }

A.java SmallProg
B.avac SmallProg
C.javac SmallProg.java
D.java SmallProg main

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3.单项选择题How do objects pass messages in Java？（）

A.They pass messages by modifying each other’s member variables
B.They pass messages by modifying the static member variables of each other’s classes
C.They pass messages by calling each other’s instance member methods
D.They pass messages by calling static member methods of each other’s classes.

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4.多项选择题 Given that Thing is a class， how many objects and reference variables are created by the following code？（）
Thing item， stuff；
item = new Thing（）；
Thing entity = new Thing（）；

A.One object is created
B.Two objects are created
C.Three objects are created
D.One reference variable is created
E.Two reference variables are created
F.Three reference variables are created.

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5.单项选择题 Which line contains a constructor in this class definition？（）
public class Counter { // （1）
int current， step；
public Counter（int startValue， int stepValue） { // （2）
set（startValue）；
setStepValue（stepValue）； }
public int get（） { return current； } // （3）
public void set（int value） { current = value； } // （4）
public void setStepValue（int stepValue） { step = stepValue； } // （5） }

A.Code marked with （1） is a constructor
B.Code marked with （2） is a constructor
C.Code marked with （3） is a constructor
D.Code marked with （4） is a constructor
E.Code marked with （5） is a Constructor

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6.单项选择题An instance member（）

A.is also called a static member
B.is always a variable
C.is never a method
D.belongs to a single instance， not to the class as a whole
E.always represents an operation

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7.单项选择题An object is（）

A.what classes are instantiated from.
B.an instance of a class.
C.a blueprint for creating concrete realization of abstractions.
D.a reference to an attribute.
E.a variable.

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8.单项选择题A method is（）

A.an implementation of an abstraction.
B.an attribute defining the property of a particular abstraction.
C.a category of objects.
D.an operation defining the behavior for a particular abstraction.
E.a blueprint for making operations.

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9.单项选择题 1. public class X {
2. public object m （） {
3. object o = new float （3.14F）；
4. object [] oa = new object [1]；
5. oa[0]= o；
6. o = null；
7. oa[0] = null；
10. return o；
9. }
10. }
When is the float object created in line 3， eligible for garbage collection？（）

A. Just after line 5.
B. Just after line 6.
C. Just after line 7.
D. Just after line 8（that is， as the method returns）.

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10.多项选择题 public class MethodOver {
private int x， y；
private float z；
public void setVar（int a， int b， float c）{
x = a；
y = b；
z = c；
}
}
Which two overload the setVar method？（）

A. void setVar （int a， int b， float c）{ x = a； y = b； z = c； }
B. public void setVar（int a， float c， int b） { setVar（a， b， c）； }
C. public void setVar（int a， float c， int b） { this（a， b， c）； }
D. public void setVar（int a， float b）{ x = a； z = b； }
E. public void setVar（int ax， int by， float cz） { x = ax； y = by； z = cz； }

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