SCJP考试题310-025(第二套)

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Given: 
2. public static void main (String args) { 
4. int j = ~i; 
6. } 
What is the decimal value of j at line 5? 
B. 1 
D. –15 
F. An error at line 4 causes compilation to fail. 
Question No: 2 
Integer i = new Integer (42); 
Double d = new Double (42.0); 
A. (i ==1) 
C. (d == 1) 
E. (d.equals (i)) 
Answer: D, E 
Exhibit : 
2. private static int j = 0; 
4. private static boolean methodB(int k) ( 
6. return true; 
7. 
9. boolean b: 
11. b = i < 10 || methodB (8); 
13. 
15. methodA (0); 
17. ) 
What is the result? 
B. The program prints "4" 
D. The program prints "12" 
Answer: B 
Given 
2. Public static void main (String args) ( 
4. ) 
What is the output? 
Question No: 5 
1. public class Foo { 
3. StringBuffer a = new StringBuffer ("A"); 
5. operate (a,b); 
7. ) 
9. x.append {y}; 
11. ) 
What is the result? 
B. The code compiles and prints "A,A". 
D. The code compiles and prints "AB,B". 
F. The code does not compile because "+" cannot be overloaded for StringBuffer. 

Question No: 6 
1. Public class test ( 
3. Text = text.replace ('j' , 'i'); 
5. 
7. text = text.append ("C") 
9. 
11. String textString = new String ("java"); 
13. 
15. BufferReplace (textBuffer); 
17. System.out.printIn (textString + textBuffer); 
19. ) 
Answer: javajavaC
Exhibit: 
2. public static void add3 (Integer i) } 
4. val += 3; 
6. } 
8. public static void main (String args [ ] ) { 
10. add3 (i); 
12. } 
What is the result? 
B. The program prints "0". 
D. Compilation will succeed but an exception will be thrown at line 3. 
Question No: 8 
1. public class ConstOver { 
3. } 
Which two overload the ConstOver constructor? (Choose Two) 
B. Protected int ConstOver ( ) { } 
D. Public Object ConstOver (int x, int y, int z) { } 
Answer: A, C 
Given: 
2. public void setVar (int a, int b, float c) { 
4. } 
A. Private void setVar (int a, float c, int b) { } 
C. Public int setVar (int a, float c, int b) (return a;) 
E. Protected float setVar (int a, int b, float c) (return c;) 
Question No: 10 
1. class BaseClass { 
3. protected float getVar ( ) ( return x;) 
5. class Subclass extends BaseClass ( 
7. //insert code here 
Which two are valid examples of method overriding? (Choose Two) 
B. Public float getVar ( ) { return x;} 
D. Public float getVar ( ) { return x;} 
Answer: B, D 
Which two demonstrate an "is a" relationship? (Choose Two) 
public class Employee extends Person { } 
public class Employee extends Shape { } 
public class Employee extends Color { } 
public class Animal (private Species species;) 
Class Container implements Component ( 
) 
Question No: 12 
A. An anonymous inner class may be declared as final. 
C. An anonymous inner class can implement multiple interfaces. 
E. Construction of an instance of a static inner class requires an instance of the enclosing outer class. 

Question No 13 
1. package foo; 
3. public class Outer ( 
5. ) 
Which statement is true? 
B. An instance of the inner class cannot be constructed outside of package foo. 
D. From within the package bar, an instance of the inner class can be constructed with "new inner()" 
Question No 14 
1. public class enclosingone ( 
3. ) 
5. public static void main (stringargs)( 
7. //insert code here 
9. ) 
A. InsideOnew ei= eo.new InsideOn(); 
C. InsideOne ei = EnclosingOne.new InsideOne(); 
Answer: D 
Exhibit: 
2. int k = 0; 
4. 
6. public static void main(String args) ( 
8. Test test = new test (); 
10.i= Test.k; 
12.) 
14. 
A. Compilation succeeds. 
C. An error at line 9 causes compilation to fail. 
E. An error at line 11 causes compilation to fail. 
Question No 16 
1. //point X 
3. public static void main (Stringargs) throws Exception { 
5. java.io.outputStreamWriter (System.out), true; 
7. } 
Which statement at PointX on line 1 allows this code to compile and run? 
B. Include java.io.PrintWriter; 
D. Include java.io.OutputStreamWriter; 
Answer: A 
Which two statements are reserved words in Java? (Choose Two) 
B. Import 
D. Implement 
Question No 18 
A. Float foo = -1; 
C. Float foo = 42e1; 
E. Float foo = 3.03d; 
Answer: A, D, F