public class X implements Runnable（
private int x；
private int y；
public static void main（Stringargs）
X that = new X（）；
（new Thread（that））.start（）；
（new Thread（that））.start（）；
）
public void run（） （
for （；；） （
x++；
y++；
System.out.printIn（“x=” + x + “， y = ” + y）；
）
）
What is the result？（）
A. Errors at lines 7 and 8 cause compilation to fail.
B. The program prints pairs of values for x and y that might not always be the same on the same line （for example， “x=2， y=1”）.
C. The program prints pairs of values for x and y that are always the same on the same line （for example， “x=1， y=1”. In addition， each value appears twice （for example， “x=1， y=1” followed by “x=1， y=1”）.
D. The program prints pairs of values for x and y that are always the same on the same line （for example， “x=1， y=1”. In addition， each value appears only for once （for example， “x=1， y=1” followed by “x=2， y=2”）.
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A. The elements in the collection are ordered.
B. The collection is guaranteed to be immutable.
C. The elements in the collection are guaranteed to be unique.
D. The elements in the collection are accessed using a unique key.
E. The elements in the collections are guaranteed to be synchronized.
A. Java.util.Map
B. Java.util.Set
C. Java.util.List
D. Java.util.StoredSet
E. Java.util.StoredMap
F. Java.util.Collection
switch （i） {
default：
System.out.printIn（“Hello”）；
}
What is the acceptable type for the variable i？（）
A. Byte
B. Long
C. Float
D. Double
E. Object
F. A and B
G. C and D
int I=1， j=0
switch（i） {
case 2：
j+=6；
case 4：
j+=1；
default：
j +=2；
case 0：
j +=4；
}
What is the value of j at line 16？（）
A. 0
B. 1
C. 2
D. 4
E. 6
public class WhileFoo {
public static void main （String args） {
int x= 1， y = 6；
while （y--） {x--；}
system.out.printIn（“x=” + x “y =” + y）；
}
}
What is the result？（）
A. The output is x = 6 y = 0
B. The output is x = 7 y = 0
C. The output is x = 6 y = -1
D. The output is x = 7 y = -1
E. Compilation will fail.
public class X {
public static void main （String args） {
byte b = 127；
byte c = 126；
byte d = b + c；
}
}
Which statement is true？（）
A. Compilation succeeds and d takes the value 253.
B. Line 5 contains an error that prevents compilation.
C. Line 5 throws an exception indicating “Out of range”
D. Line 3 and 4 contain error that prevent compilation.
E. The compilation succeeds and d takes the value of 1.
public class X {
public static void main （Stringargs） {
int a = new int [1]
modify（a）；
System.out.printIn（a[0]）；
}
public static void modify （int a） {
a[0] ++；
}
}
What is the result？（）
A. The program runs and prints “0”
B. The program runs and prints “1”
C. The program runs but aborts with an exception.
D. An error “possible undefined variable” at line 4 causes compilation to fail.
E. An error “possible undefined variable” at line 9 causes compilation to fail.
A. 16>4
B. 16/2
C. 16*4
D. 16>>2
E. 16/2^2
F. 16>>>2
public class X {
public static void main （Stringargs） {
string s = new string （“Hello”）；
modify（s）；
System.out.printIn（s）；
}
public static void modify （String s） {
s += “world!”；
}
}
What is the result？（）
A.The program runs and prints “Hello”
B.An error causes compilation to fail.
C.The program runs and prints “Hello world!”
D.The program runs but aborts with an exception.
public class Foo {
public static void main （String args） {
int i = 1；
int j = i++；
if （（i>++j） && （i++ ==j）） {
i +=j；
}
}
}
What is the final value of i？（）
A. 1
B. 2
C. 3
D. 4
E. 5
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