Which of the following statements about variables and scope are true？（）

A. Local variables defined inside a method are destroyed when the method is exited.
B. Local variables are also called automatic variables.
C. Variables defined outside a method are created when the object is constructed.
D. A method parameter variable continues to exist for as long as the object is needed in which the method is defined.

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）；

Which are not Java keywords？ （）

A. TRUE
B. sizeof
C. const
D. super
E. void

1. interface DoStuff2 { 2. float getRange（int low， int high）； } 3. 4. interface DoMore { 5. float getAvg（int a， int b， int c）； } 6. 7. abstract class DoAbstract implements DoStuff2， DoMore { } 8. 9. class DoStuff implements DoStuff2 { 10. public float getRange（int x， int y） { return 3.14f； } } 11. 12. interface DoAll extends DoMore { 13. float getAvg（int a， int b， int c， int d）； } What is the result？（）

A. The file will compile without error.
B. Compilation fails. Only line 7 contains an error.
Compilation fails. Only line 12 contains an error.
D. Compilation fails. Only line 13 contains an error.
E. Compilation fails. Only lines 7 and 12 contain errors.
F. Compilation fails. Only lines 7 and 13 contain errors.
G. Compilation fails. Lines 7， 12， and 13 contain errors.

System.out.format（”Pi is approximately %d.”， Math.PI）； What is the result？（）

A. Compilation fails.
B. Pi is approximately 3.
C. Pi is approximately 3.141593.
D. An exception is thrown at runtime.

11. double d = Math.random（）； Which is true about d after line 11？（）

A. d >= 1.0
B. 0.0 <= d < 1.0
C. 0.0 <= d < Double.MAX_VALUE
D. 0.0 <= d <= Double.MAX_VALUE
E. Double.MIN_VALUE <= d < Double.MAX_VALUE

public static void parse（String str） { try { float f= Float.parseFloat（str）； } catch （NumberFormatException nfe） { f= 0； } finally { System.out.println（f）； } } public static void main（String[] args） { parse（”invalid”）； } What is the result？（）

A. 0.0
B. Compilation fails.
C. A ParseException is thrown by the parse method at runtime.
D. A NumberFormatException is thrown by the parse method at runtime.

1. public class A { 2. public String doit（int x， int y） { 3. return “a”； 4. } 5. 6. public String doit（int... vals） { 7. return “b”； 8. } 9. } Given： 25. A a=new A（）； 26. System.out.println（a.doit（4， 5））； What is the result？（）

A. Line 26 prints “a” to System.out.
B. Line 26 prints „b” to System.out.
C. An exception is thrown at line 26 at runtime.
D. Compilation of class A will fail due to an error in line 6.

5. String foo = “base”； 6. foo.substring（0，3）； 7. foo.concat（“ket”） 8. Type the value of foo at line 8.（）

public class SyncTest{ public static void main（String args） { final StringBuffer s1= new StringBuffer（）； final StringBuffer s2= new StringBuffer（）； new Thread （） { public void run（） { synchronized（s1） { s2.append（“A”）； synchronized（s2） { s2.append（“B”）； System.out.print（s1）； System.out.print（s2）； } } } }.start（）； new Thread（） { public void run（） { synchronized（s2） { s2.append（“C”）； synchronized（s1） { s1.append（“D”）； System.out.print（s2）； System.out.print（s1）； } } } }.start（）； } } Which two statements are true？ （）

A. The program prints “ABBCAD”
B. The program prints “CDDACB”
C. The program prints “ADCBADBC”
D. The output is a non-deterministic point because of a possible deadlock condition.
E. The output is dependent on the threading model of the system the program is running on.