Fill in the code in Comparable________ c = new Date(); Which of the following me

Question

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

Which of the following methods are in the Collection interface?

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

java.util.Vector is a subtype of ________.

What is the output of the following code?

import java.util.*;

public class Test {
public static void main(String[] args) {
List<String> list1 = new ArrayList();
list1.add("Atlanta");
list1.add("Macon");
list1.add("Savanna");

List<String> list2 = new ArrayList();
list2.add("Atlanta");
list2.add("Macon");
list2.add("Savanna");

List<String> list3 = new ArrayList();
list3.add("Macon");
list3.add("Savanna");
list3.add("Atlanta");

System.out.println(list1.equals(list2) + " " + list1.equals(list3));
}
}

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

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

Analyze the following code.

import java.util.*;

public class Test {
public static void main(String[] args) throws Exception {
Set<String> set = new TreeSet<String>();

set.add("Red");
set.add("Green");
set.add("Blue");

System.out.println(set.first());
}
}

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

What is the output for the following code?

import java.util.*;
public class Test {
public static void main(String[] args) {
Set<A> set = new HashSet<A>();
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;
}
}

The printout of the following code is ________.

LinkedHashSet<String> set1 = new LinkedHashSet<String>();
set1.add("New York");
LinkedHashSet<String> set2 = (LinkedHashSet<String>)(set1.clone());
set1.add("Atlanta");
set2.add("Dallas");
System.out.println(set2);

Explanation / Answer

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

Answer:<Date>

Which of the following methods are in the Collection interface?

Answer:

remove(o: E): boolean

removeAll(c: Collection?>): boolean

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

Answer: true

java.util.Vector is a subtype of

Answer: java.util.List

What is the output of the following code?

Answer: true false

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

Answer:x.contains(element)

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

Answer: set2.contains("Savannah")

Analyze the following code.

Answer:

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

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

Answer: true true

What is the output for the following code?

Answer: [1, 1, 1, 1]

The printout of the following code is ________.
Answer: [New York, Dallas]

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