Fill in the code in Comparable________ c = new Date();

String>

?>

E>

Date>

Which of the following methods are in the Collection interface?

remove(o: E): boolean

delete(o: E): boolean

deleteAll(c: Collection?>): boolean

removeAll(c: Collection?>): boolean

You can sort an array using the sort method in the Arrays class.

true

false

java.util.Vector is a subtype of ________.

java.util.LinkedList

java.util.ArrayList

java.util.List

java.util.Vector

java.util.AbstractList

What is the output of the following code? import java.util.*; public class Test { public static void main(String[] args) { List list1 = new ArrayList(); list1.add("Atlanta"); list1.add("Macon"); list1.add("Savanna"); List list2 = new ArrayList(); list2.add("Atlanta"); list2.add("Macon"); list2.add("Savanna"); List list3 = new ArrayList(); list3.add("Macon"); list3.add("Savanna"); list3.add("Atlanta"); System.out.println(list1.equals(list2) + " " + list1.equals(list3)); } }

true true

true false

false false

false true

Which method do you use to test if an element is in a set or list named x?

x.in(element)

(element instanceof List) || (element instanceof Set)

x.include(element)

x.contains(element)

x.contain(element)

Suppose set1 is ["Atlanta", "Macon"] and set2 is ["Atlanta", "Macon", "Savannah"], which of the following returns true?

set2.contains(set1)

set1.contains(set2)

set1.contains("Savannah")

set2.contains("Savannah")

Analyze the following code. import java.util.*; public class Test { public static void main(String[] args) throws Exception { Set set = new TreeSet(); set.add("Red"); set.add("Green"); set.add("Blue"); System.out.println(set.first()); } }

The program cannot compile, because the first() method is not defined in Set.

The program may display Red, Blue, or Green.

The program displays Green

The program displays Red

The program displays Blue

If two objects o1 and o2 are equal, what are the values for o1.equals(o2) and o1.hashCode() == o2.hashCode()?

true false

false true

false false

true true

What is the output for the following code? import java.util.*; public class Test { public static void main(String[] args) { Set set = new HashSet(); set.add(new A()); set.add(new A()); set.add(new A()); set.add(new A()); System.out.println(set); } } class A { int r = 1; public String toString() { return r + ""; } public boolean equals(Object o) { return this.r == ((A)o).r; } }

[1]

[1, 1, 1, 1]

[1, 1]

[1, 1, 1]

The printout of the following code is ________. LinkedHashSet set1 = new LinkedHashSet(); set1.add("New York"); LinkedHashSet set2 = (LinkedHashSet)(set1.clone()); set1.add("Atlanta"); set2.add("Dallas"); System.out.println(set2);

[New York, Dallas]

[New York, Atlanta, Dallas]

[New York]

[New York, Atlanta]