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1、Choose the three valid identifiers from those listed below. (Choose three)?
A. IDoLikeTheLongNameClass
B. $byte
C. const
D. _ok
E. 3_case
答：ABD
2、Which of the following lines of code will compile without error (Choose two)?
A.
int i=0;
if (i) {
System.out.println(“Hi”);
}
B.
boolean b=true;
boolean b2=true;
if(b==b2) {
System.out.println(“So true”);
}
C.
int i=1;
int j=2;
if(i==1|| j==2)
System.out.println(“OK”);
D.
int i=1;
int j=2;
if (i==1 &| j==2)
System.out.println(“OK”);
答：BC
3、Which two demonstrate a "has a" relationship(Choose two)?
A. public interface Person { }
public class Employee extends Person{ }
B. public interface Shape { }
public interface Rectandle extends Shape { }
C. public interface Colorable { }
public class Shape implements Colorable
{ }
D. public class Species{ }
public class Animal{private Species species;}
E. interface Component{ }
class Container implements Component{
private Component[] children;
}
答：DE
4、What will happen when you attempt to compile and run the following code?
public class Static{
static {
int x = 5;
}
static int x,y;
public static void main(String args[]){
x--;
myMethod();
System.out.println(x + y + ++x);
}
public static void myMethod(){
y = x+++++x;
}
}
A.compiletime error
B.prints: 1
C.prints: 2
D.prints: 3
E.prints: 7
F.prints: 8
A答：D
5、What is the correct ordering for the import, class and package
declarations when found in a single file?
A. package, import, class
B. class, import, package
C. import, package, class
D. package, class, import
答：A
6、What will happen when you attempt to compile and run the following code.
public class Pvf{
static boolean Paddy;
public static void main(String argv[]){
System.out.println(Paddy);
}
}
A. Compile time error B. compilation and output of false
C. compilation and output of true D. compilation and output of null 答：B
7、Given the folowing classes which of the following will compile without error?
interface IFace{}
class CFace implements IFace{}
class Base{}
public class ObRef extends Base{
public static void main(String argv[]){
ObRef ob = new ObRef();
Base b = new Base();
Object o1 = new Object();
IFace o2 = new CFace();
}
}
A. o1=o2; B. b=ob; C. ob=b; D. o1=b;
答：ABD
8、下面那几个函数是public void method(){...}的重载函数?
A)public void method( int m){...} B)public int method(){...}
C)public void method2(){...} D)public int method(int m，float f ){...} 答：AD
9、给出如下声明：
String s = “Example”;
合法的代码有哪些?
A)s>>>=3 B)s[3]= “X” C)int i = s.length() D)s = s + 10 答：CD
10、如下哪些不是java的关键字?
A)const B)NULL C) false D)this E) native
答：B
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