SCJP考试题-1

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SCJP考试题-1

发表于：2008年4月30日 13时51分47秒阅读(6)评论(0)本文链接：http://user.qzone.qq.com/169188811/blog/1209534707

[align=center]SCJP考试题-1[/align] Leading the way in IT testing and certification tools,QUESTION NO: 92 Given: 1. String foo = “blue”; 2. Boolean[]bar = new Boolean [1]; 3. if (bar[0]) { 4. foo = “green”; 5. } What is the result? A. Foo has the value of “” B. Foo has the value of null. C. Foo has the value of “blue” D. Foo has the value of “green” E. An exception is thrown. F. The code will not compile. Answer: F QUESTION NO: 93 Exhibit: 1. public class X { 2. public static void main (String[]args) { 3. String s1 = new String (“true”); 4. Boolean b1 = new Boolean (true); 5. if (s2.equals(b1)) { 6. System.out.printIn(“Equal”); 7. } 8. } 9. } What is the result? A. The program runs and prints nothing. B. The program runs and prints “Equal” C. An error at line 5 causes compilation to fail. D. The program runs but aborts with an exception. Answer: A QUESTION NO: 94 Given: 1. public class Foo { 2. public static void main (String []args) { 3. int i = 1; 4. int j = i++; 5. if ((i>++j) && (i++ ==j)) { 6. i +=j; 7. } 8. } 9. } What is the final value of i? A. 1 B. 2 C. 3 D. 4 E. 5 Answer: B QUESTION NO: 95 Exhibit: 1. public class X { 2. public static void main (String[]args) { 3. string s = new string (“Hello”); 4. modify(s); 5. System.out.printIn(s); 6. } 7. 8. public static void modify (String s) { 9. s += “world!”; 10. } 11. } What is the result? E. The program runs and prints “Hello” F. An error causes compilation to fail. G. The program runs and prints “Hello world!” H. The program runs but aborts with an exception. Answer: A QUESTION NO: 96 Which two are equivalent? (Choose Two) A. 16>4 B. 16/2 C. 16*4 D. 16>>2 E. 16/2^2 F. 16>>>2 Answer: D, E QUESTION NO: 97 Exhibit: 1. public class X { 2. public static void main (String[]args) { 3. int [] a = new int [1] 4. modify(a); 5. System.out.printIn(a[0]); 6. } 7. 8. public static void modify (int[] a) { 9. a[0] ++; 10. } 11. } 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. Answer: B QUESTION NO: 98 Given: 13. public class Foo { 14. public static void main (String [] args) { 15. StringBuffer a = new StringBuffer (“A”); 16. StringBuffer b = new StringBuffer (“B”); 17. operate (a,b); 18. system.out.printIn{a + “,” +b}; 19. ) 20. static void operate (StringBuffer x, StringBuffer y) { 21. y.append {x}; 22. y = x; 23. ) 24. } What is the result? A. The code compiles and prints “A,B”. B. The code compiles and prints “A, BA”. C. The code compiles and prints “AB, B”. D. The code compiles and prints “AB, AB”. E. The code compiles and prints “BA, BA”. F. The code does not compile because “+” cannot be overloaded for stringBuffer. Answer: B QUESTION NO: 99 Given: 1. public class X { 2. public static void main (String[] args) { 3. byte b = 127; 4. byte c = 126; 5. byte d = b + c; 6. } 7. } 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. Answer: B QUESTION NO: 100 Given: 1. public class WhileFoo { 2. public static void main (String []args) { 3. int x= 1, y = 6; 4. while (y--) {x--;} 5. system.out.printIn(“x=” + x “y =” + y); 6. } 7. } 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. Answer: E QUESTION NO: 101 Which statement is true? A. The Error class is a untimeException. B. No exceptions are subclasses of Error. C. Any statement that may throw an Error must be enclosed in a try block. D. Any statement that may throw an Exception must be enclosed in a try block. E. Any statement that may thro a runtimeException must be enclosed in a try block. Answer: D QUESTION NO: 102 Exhibit: 1. int I=1, j=0 2. 3. switch(i) { 4. case 2: 5. j+=6; 6. 7. case 4: 8. j+=1; 9. 10. default: 11. j +=2; 12. 13. case 0: 14. j +=4; 15. } 16. What is the value of j at line 16? A. 0 B. 1 C. 2 D. 4 E. 6 Answer: AE QUESTION NO: 103 Given: 1. switch (i) { 2. default: 3. System.out.printIn(“Hello”); 4. ) 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 Answer: A QUESTION NO: 104 You need to store elements in a collection that guarantees that no duplicates are stored. Which two interfaces provide that capability? (Choose Two) A. Java.util.Map B. Java.util.Set C. Java.util.List D. Java.util.StoredSet E. Java.util.StoredMap F. Java.util.Collection Answer: B, D QUESTION NO: 105 Which statement is true for the class java.util.ArrayList? 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. Answer: A

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