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单选题
public class Ball {  public enum Color { RED, GREEN, BLUE };  public void foo() {  // insert code here  { System.out.println(c); }  }  }  Which code inserted at line 14 causes the foo method to print RED, GREEN, and BLUE?()
A

 for( Color c : Color.values())

B

 for( Color c = RED; c <= BLUE; c++)

C

 for( Color c; c.hasNext() ; c.next())

D

 for( Color c = Color[0]; c <= Color[2]; c++)

E

 for( Color c = Color.RED; c <= Color.BLUE; c++)


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考题 多选题Which three demonstrate an “is a” relationship?()Apublic class X { }  public class Y extends X { }Bpublic interface Shape { }  public interface Rectangle extends Shape{ }Cpublic interface Color { }  public class Shape { private Color color; }Dpublic interface Species { }  public class Animal { private Species species; }Epublic class Person { } public class Employee {  public Employee(Person person) { }Finterface Component { }  class Container implements Component { private Component[] children; }

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考题 单选题public class Test {  public static void main (String [] args)  {  string foo = “blue”;  string bar = foo;  foo = “green”;  System.out.printIn(bar);  }  }   What is the result?()A  An exception is thrown.B  The code will not compile.C  The program prints “null”D  The program prints “blue”E  The program prints “green”

考题 多选题package sun.scjp;  public enum Color { RED, GREEN, BLUE }  package sun.beta;  // insert code here  public class Beta {  Color g = GREEN;  public static void main( String[] argv)  { System.out.println( GREEN); }  }  The class Beta and the enum Color are in different packages.  Which two code fragments, inserted individually at line 2 of the Beta declaration, will allow this code to compile?()Aimport sun.scjp.Color.*;Bimport static sun.scjp.Color.*;Cimport sun.scjp.Color; import static sun.scjp.Color.*;Dimport sun.scjp.*; import static sun.scjp.Color.*;Eimport sun.scjp.Color; import static sun.scjp.Color.GREEN;