Sun Certified Java Professional (SCJP) 1.5 Question Bank - 18

Given:
11. public abstract class Shape {
12.   private int x;
13.   private int y;
14.   public abstract void draw();
15.   public void setAnchor(int x, int y) {
16.     this.x = x;
17.     this.y = y;
18.   }
19. }
Which two classes use the Shape class correctly? (Choose two.)
A. public class Circle implements Shape {
     private int radius;
   }
B. public abstract class Circle extends Shape {
     private int radius;
   }
C. public class Circle extends Shape {
     private int radius;
     public void draw();
   }
D. public abstract class Circle implements Shape {
     private int radius;
     public void draw();
   }
E. public class Circle extends Shape {
     private int radius;
     public void draw() {/* code here */}
F. public abstract class Circle implements Shape {
     private int radius;
     public void draw() { /* code here */ }

Given
10. class Foo {
11.   static void alpha() { /* more code here */ }
12.   void beta() { /* more code here */ }
13. }
Which two statements are true? (Choose two.)
A. Foo.beta() is a valid invocation of beta().
B. Foo.alpha() is a valid invocation of alpha().
C. Method beta() can directly call method alpha().
D. Method alpha() can directly call method beta().

Given:
10. class One {
11.   public One() { System.out.print(1); }
12. }
13. class Two extends One {
14.   public Two() { System.out.print(2); }
15. }
16. class Three extends Two {
17.   public Three() { System.out.print(3); }
18. }
19. public class Numbers{
20.   public static void main( String[] argv ) { new Three(); }
21. }
What is the result when this code is executed?
A. 1
B. 3
C. 123
D. 321
E. The code runs with no output.

Given:
10. class Nav{
11.   public enum Direction { NORTH, SOUTH, EAST, WEST }
12. }
13. public class Sprite{
14.   // insert code here
15. }
Which code, inserted at line 14, allows the Sprite class to compile?
A. Direction d = NORTH;
B. Nav.Direction d = NORTH;
C. Direction d = Direction.NORTH;
D. Nav.Direction d = Nav.Direction.NORTH;

Given:
10. class One {
11.   public One foo() { return this; }
12. }
13. class Two extends One {
14.   public One foo() { return this; }
15. }
16. class Three extends Two {
17.   // insert method here
18. }
Which two methods, inserted individually, correctly complete the Three class? (Choose two.)
A. public void foo() {}
B. public int foo() { return 3; }
C. public Two foo() { return this; }
D. public One foo() { return this; }
E. public Object foo() { return this; }

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