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选择题
1:Which of the following answer is correct to express the value 8 in octal number?
A.010
B.0x10
C.08
D.0x8
2:Which statement about listener is true?
A.Most component allow multiple listeners to be added.
B.If multiple listener be add to a single component, the event only affected one listener.
C.Component don?t allow multiple listeners to be add.
D.none
3:
Give the following java class:
public class Example{
static int x[]=new int[15];
public static void main(String args[]){
System.out.println(x[5]);
}
}
Which statement is corrected?
Give the following java class:
public class Example{
static int x[]=new int[15];
public static void main(String args[]){
System.out.println(x[5]);
}
}
Which statement is corrected?
A.When compile, some error will occur.
B.When run, some error will occur.
C.Output is zero.
D.Output is null.
4:
Give the following java source fragement:
//point x
public class Interesting{
//do something
}
Which statement is correctly Java syntax at point x?
Give the following java source fragement:
//point x
public class Interesting{
//do something
}
Which statement is correctly Java syntax at point x?
A.public class MyClass{//do other thing…}
B.static int PI=3.14
C.class MyClass{//do something…}
D.none
5:
What will be the result of executing the following code?
boolean a = true;
boolean b = false;
boolean c = true;
if (a == true)
if (b == true)
if (c == true) System.out.println("Some things are true in this world");
else System.out.println("Nothing is true in this world!");
else if (a && (b = c)) System.out.println("It's too confusing to tell what is true and what is false");
else System.out.println("Hey this won't compile");
Choices:
What will be the result of executing the following code?
boolean a = true;
boolean b = false;
boolean c = true;
if (a == true)
if (b == true)
if (c == true) System.out.println("Some things are true in this world");
else System.out.println("Nothing is true in this world!");
else if (a && (b = c)) System.out.println("It's too confusing to tell what is true and what is false");
else System.out.println("Hey this won't compile");
Choices:
A.The code won't compile
B."Some things are true in this world" will be printed
C."Hey this won't compile" will be printed
D.None of these
6:
What will be the result of executing the following code?
// Filename; SuperclassX.java
package packageX;
public class SuperclassX
{
protected void superclassMethodX()
{
}
int superclassVarX;
}
// Filename SubclassY.java
1.package packageX.packageY;
2.
3.public class SubclassY extends SuperclassX
4.{
5.SuperclassX objX = new SubclassY();
6.SubclassY objY = new SubclassY();
7.void subclassMethodY()
8.{
9.objY.superclassMethodX();
10.int i;
11.i = objY.superclassVarX;
12.}
13.}
Choices:
What will be the result of executing the following code?
// Filename; SuperclassX.java
package packageX;
public class SuperclassX
{
protected void superclassMethodX()
{
}
int superclassVarX;
}
// Filename SubclassY.java
1.package packageX.packageY;
2.
3.public class SubclassY extends SuperclassX
4.{
5.SuperclassX objX = new SubclassY();
6.SubclassY objY = new SubclassY();
7.void subclassMethodY()
8.{
9.objY.superclassMethodX();
10.int i;
11.i = objY.superclassVarX;
12.}
13.}
Choices:
A.Compilation error at line 5
B.Compilation error at line 9
C.Runtime exception at line 11
D.None of these
7:在下述选项时,没有构成死循环的程序是
A.int i=100 while (1) { i=i%100+1; if (i>100) break; }
B.for (;;);
C.int k=1000; do { ++k; }while(k>=10000);
D.int s=36; while (s);--s;
8:Which fragments are not correct in Java source file?
A.package testpackage; public class Test{//do something...}
B.import java.io.*; package testpackage; public class Test{// do something...}
C.import java.io.*; class Person{// do something...} public class Test{// do something...}
D.import java.io.*; import java.awt.*; public class Test{// do something...}
9:
下述程序代码中有语法错误的行是( )。
int i,ia[10],ib[10]; /*第一行*/
for (i=0;i<=9;i++) /*第2行*/
ia[i]=0; /*第3行*/
ib=ia; /*第4行*/
下述程序代码中有语法错误的行是( )。
int i,ia[10],ib[10]; /*第一行*/
for (i=0;i<=9;i++) /*第2行*/
ia[i]=0; /*第3行*/
ib=ia; /*第4行*/
A.第1行
B.第2行
C.第3行
D.第4行
10:在软件生命周期中,下列哪个说法是不准确的?
A.软件生命周期分为计划、开发和运行三个阶段
B.在计划阶段要进行问题焉醛和需求分析
C.在开发后期要进行编写代码和软件测试
D.在运行阶段主要是进行软件维护
11:下面关于变量及其范围的陈述哪些是错的。
A.实例变量是类的成员变量。
B.实例变量用关键字static声明。
C.在方法中定义的局部变量在该方法被执行时创建
D.局部变量在使用前必须被初始化。
12:Which modifier should be applied to a method for the lock of object this to be obtained prior to excution any of the method body?
A.synchronized
B.abstract
C.final
D.static
13: Consider the class hierarchy shown below:
--------------------------------------------------------------------
class FourWheeler implements DrivingUtilities
class Car extends FourWheeler
class Truck extends FourWheeler
class Bus extends FourWheeler
class Crane extends FourWheeler
----------------------------------------------------------------------
Consider the following code below:
1.DrivingUtilities du;
2.FourWheeler fw;
3.Truck myTruck = new Truck();
4.du = (DrivingUtilities)myTruck;
5.fw = new Crane();
6.fw = du;
Which of the statements below are true?
Choices:
A.Line 4 will not compile because an interface cannot refer to an object.
B.The code will compile and run.
C.The code will not compile without an explicit cast at line 6, because going down the hierarchy without casting is not allowed.
D.The code will compile if we put an explicit cast at line 6 but will throw an exception at runtime.
14:以下的C程序代码片段运行后C和d的值分别是多少
Int a =1,b =2;
Int c,d;
c =(a&b)&&a;
d =(a&&b)&a;
A.0,0
B.0,1
C.1,0
D.1,1
15:
What will be printed when you execute the following code?
class X
{
Y b = new Y();
X()
{
System.out.print("X");
}
}
class Y
{
Y()
{
System.out.print("Y");
}
}
public class Z extends X
{
Y y = new Y();
Z()
{
System.out.print("Z");
}
public static void main(String[] args)
{
new Z();
}
}
Choices:
What will be printed when you execute the following code?
class X
{
Y b = new Y();
X()
{
System.out.print("X");
}
}
class Y
{
Y()
{
System.out.print("Y");
}
}
public class Z extends X
{
Y y = new Y();
Z()
{
System.out.print("Z");
}
public static void main(String[] args)
{
new Z();
}
}
Choices:
A.Z
B.YZ
C.XYZ
D.YXYZ
16:
Give the following code:
public class Example{
public static void main(String args[] ){
int l=0;
do{
System.out.println(“Doing it for l is:”+l);
}while(--l>0)
System.out.println(“Finish”);
}
}
Which well be output:
Give the following code:
public class Example{
public static void main(String args[] ){
int l=0;
do{
System.out.println(“Doing it for l is:”+l);
}while(--l>0)
System.out.println(“Finish”);
}
}
Which well be output:
A.Doing it for l is 3
B.Doing it for l is 1
C.Doing it for l is 2
D.Doing it for l is 0
17:
The following code is entire contents of a file called Example.java,causes precisely one error during compilation:
class SubClass extends BaseClass{
}
class BaseClass(){
String str;
public BaseClass(){
System.out.println(“ok”);}
public BaseClass(String s){
str=s;}}
public class Example{
public void method(){
SubClass s=new SubClass(“hello”);
BaseClass b=new BaseClass(“world”);
}
}
Which line would be cause the error?
The following code is entire contents of a file called Example.java,causes precisely one error during compilation:
class SubClass extends BaseClass{
}
class BaseClass(){
String str;
public BaseClass(){
System.out.println(“ok”);}
public BaseClass(String s){
str=s;}}
public class Example{
public void method(){
SubClass s=new SubClass(“hello”);
BaseClass b=new BaseClass(“world”);
}
}
Which line would be cause the error?
A.9
B.10
C.11
D.12
18:设有变量说明语句int a=1,b=0;
则执行以下程序段的输出结果为( )。
switch (a)
{
case 1:
switch (b)
{
case 0:printf("**0**");break;
case 1:printf("**1**");break;
}
case 2:printf("**2**");break;
}
printf("\n");
A.**0**
B.**0****2**
C.**0****1****2**
D.有语法错误
19:What is written to the standard output given the following statement:System.out.println(4|7);
Select the right answer:
A.4
B.5
C.6
D.7
20:Which is the main() method return of a application?
A.String
B.byte
C.char
D.void
21:Math.round(11.5)等於多少?
A.11
B.12
C.11.5
D.none
简答题
22:说出ArrayList,Vector, LinkedList的存储性能和特性。
23:找出32位数中是回文数,且其开方为整数的数。
24:X博士是一个研究儿童智力开发方法的科学家,他为幼儿教育领域做出了许多贡献。最近,X博士正在研究一种适合儿童的游戏,用以辅助发展儿童的观察力、注意力和思维能力。经过连日的构思,X博士终于设计出了一种游戏:彩球游戏。
彩球游戏是一种单人参与的游戏,游戏首先给出一串由许多不同颜色的小球组成的小球序列,以及一个整数参数M(M≥2)。一段连续的具有相同颜色的小球序列称为连续同色序列。小孩,即游戏参与者,每次可以向任意一段连续同色序列插入一个同色小球,使该序列的长度加一。当一段连续同色序列在插入一个同色小球后其长度达到M时,该序列就会爆炸消失,然后原序列两边的其余小球会重新连成一串,如果两段相同颜色的连续同色序列在此时连接在一起,它们就会合并形成一段新的连续同色序列。如果新形成的连续同色序列长度达到M,这段序列也会爆炸消失,然后重复上述过程,直到没有新的长度达到M的连续同色序列出现为止。游戏的目标很简单,就是插入尽量少的小球,使得所有小球都爆炸消失掉。
通过长时间的游戏和不断提高游戏水平,这个游戏可以很好地开发儿童的观察力、注意力和思维能力。但是X博士仍然面临着一个困难的问题,他还需要设计出一个游戏演示AI程序,可以以最优的方式(即插入的小球数量最小)进行游戏,用于游戏教学,或者在游戏中对小孩给出提示。X博士并不擅长此类程序,因而他无法完成这个任务,你可以帮助他吗?
25:什么是接口?为什么要定义接口?接口与抽象类有何异同?
26:用最简单的方法判断一个数是否是2的指数次幂。
27:有一百个整数,其中有负数,找出连续三个数之和最大的部分.
28:++i与i++的区别到底怎样?
29:请写一个java程序实现线程连接池功能?
30:lucene的索引使用的什么数据结构?
31:hibernate有那些抓取策略?
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