Question

Add an equals method to this class that returns true if the current Dog and passed Dog have the same name. The code should print false twice then true twice. Dog.java 1 public class Dog 2 { 3 private String name; 4 5 public Dog(String name) 6 { 7 this.name = name; 8 } 9 10 public boolean equals(Object other) 11 { 12 // ADD CODE HERE 13 } 14 15 public static void main(String[] args) 16 { 17 Dog d1 = new Dog("Rufus"); 18 Dog d2 = new Dog("Sally"); 19 Dog d3 = new Dog("Rufus"); CONSOLE SHELL

          Add an equals method to this class that returns true if the current Dog and passed Dog have the same name. The code should
print false twice then true twice.
Dog.java
1
public class Dog
2
{
3
private String name;
4
5
public Dog(String name)
6
{
7
this.name = name;
8
}
9
10
public boolean equals(Object other)
11
{
12
// ADD CODE HERE
13
}
14
15
public static void main(String[] args)
16
{
17
Dog d1 = new Dog("Rufus");
18
Dog d2 = new Dog("Sally");
19
Dog d3 = new Dog("Rufus");
CONSOLE
SHELL

Show more…

Add an equals method to this class that returns true if the current Dog and passed Dog have the same name. The code should
print false twice then true twice.
Dog.java
1
public class Dog
2

3
private String name;
4
5
public Dog(String name)
6

7
this.name = name;
8

9
10
public boolean equals(Object other)
11

12
// ADD CODE HERE
13

14
15
public static void main(String[] args)
16

17
Dog d1 = new Dog("Rufus");
18
Dog d2 = new Dog("Sally");
19
Dog d3 = new Dog("Rufus");
CONSOLE
SHELL

Added by Heather M.

Computer Science and Information Technology

Trishna Knowledge Systems 2018 Edition

Instant Answer

Solved by Expert Harriet O'Brien

Step 1

We need to use the instanceof operator to check this. If the object is not a Dog, we should return false immediately. Show more…

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Thanks for your feedback!

Add an equals method to this class that returns true if the current Dog and passed Dog have the same name. The code should print false twice then true twice. public class Dog { private String name; public Dog(String name) { this.name = name; } public boolean equals(Object other) { if (this == other) { return true; } if (other == null || getClass() != other.getClass()) { return false; } Dog dog = (Dog) other; return name.equals(dog.name); } public static void main(String[] args) { Dog d1 = new Dog("Rufus"); Dog d2 = new Dog("Sally"); Dog d3 = new Dog("Rufus"); Dog d4 = d3; System.out.println(d1.equals(d2)); System.out.println(d2.equals(d3)); System.out.println(d1.equals(d3)); System.out.println(d3.equals(d4)); } } Add an equals method to this class that returns true if the current Dog and passed Dog have the same name. The code should print false twice then true twice.

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