Any Ide allow you to generate hashcode and equals in automatic way as getters and setters .
In your case without hashcode and equals you will get false , because the objects cannot being at the same memory location .
Your (working) example below :
class Dog{
int height;
int weight;
String name;
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + height;
result = prime * result + ((name == null) ? 0 : name.hashCode());
result = prime * result + weight;
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Dog other = (Dog) obj;
if (height != other.height)
return false;
if (name == null) {
if (other.name != null)
return false;
} else if (!name.equals(other.name))
return false;
if (weight != other.weight)
return false;
return true;
}
public static void main(String[] args) {
Dog one = new Dog();
one.height=4;
one.name="fudo";
one.weight =2;
Dog two = new Dog();
two.height=4;
two.name="fudo";
two.weight =2;
if (one.equals(two)){
System.out.println("True");
}
else{
System.out.println("False");
}
}
}
Result:
To generate hashcode and equals in automatic way in eclipse :
right click in your class and :
