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单选题
Given the following code： public class Person{ int arr[] = new int[10]； public static void main（String a[]） { System.out.println（arr[1]）； } } Which statement is correct？（）
A
When compilation some error will occur.
B
It is correct when compilation but will cause error when running.
C
The output is zero.
D
The output is null.
参考答案
参考解析
解析：
实例变量在类的一个实例构造时完成初始化，而且在类的静态方法中不能直接访问类的非静态成员而只能访问类成员（像上题中一样），类的普通方法可以访问类的所有成员和方法，而静态方法只能访问类的静态成员和方法，因为静态方法属于类，而普通方法及成员变量属于类的实例，类方法（静态方法）不能使用属于某个不确定的类的实例的方法和变量，在静态方法里面没有隐含的this，而普通方法有。
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考题
多选题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 } }Aa++；Bb++；Cc++；Dd++；Ee++；
考题
单选题Given the following code： public class Person{ static int arr[] = new int[10]； public static void main（String a[]） { System.out.println（arr[1]；） } } Which statement is correct？（）A
When compilation some error will occur.B
It is correct when compilation but will cause error when running.C
The output is zero.D
The output is null.
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You are developing a Windows Communication Foundation (WCF) service that contains the following service contract.[ServiceContract（ ）]public interface IPaymentService{ [OperationContract（ ）] void RecordPayments(Person person);}public class Person{ ... }public class Employee : Person{ ... }public class Customer : Person{ ... }You need to ensure that RecordPayments can correctly deserialize into an Employee or a Customer object. What should you do?（）A
Add the following KnownType attribute to the Employee class and to the Customer class. [KnownType(GetType(Person))]B
Implement the IExtensibleDataObject interface in the Person class.C
Implement the IExtension(ofType(T)) interface in the Person class.D
Add the following KnownType attributes to the Person class. [KnownType(GetType(Employee))] [KnownType(GetType(Customer))]
考题
单选题public class Score implements Comparable { private int wins， losses； public Score（int w， int 1） { wins = w； losses = 1； } public int getWins（） { return wins； } public int getLosses（） { return losses； } public String toString（） { return “”； } // insert code here } Which method will complete this class？（）A
public int compareTo（Object o） {/*mode code here*/}B
public int compareTo（Score other） {/*more code here*/}C
public int compare（Score s1，Score s2）{/*more code here*/}D
public int compare（Object o1，Object o2）{/*more code here*/}
考题
单选题Given the uncompleted code of a class： class Person { String name， department； int age； public Person（String n）{ name = n； } public Person（String n， int a）{ name = n； age = a； } public Person（String n， String d， int a） { // doing the same as two arguments version of constructor // including assignment name=n，age=a department = d； } } Which expression can be added at the "doing the same as..." part of the constructor？（）A
Person（n，a）；B
this（Person（n，a））；C
this（n，a）；D
this（name，age）；
考题
单选题Given the following code： public class Test { void printValue（int m）{ do { System.out.println（"The value is"+m）； } while（ --m 10 ） } public static void main（String arg[]） { int i=10； Test t= new Test（）； t.printValue（i）； } } Which will be output？（）A
The value is 8B
The value is 9C
The value is 10D
The value is 11
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