HashSet: Allow Duplicates

[Ruchika Kapoor]

Hi,

Please find the code as below:

 
class Source {
private String name;

public Source(String nm){
this.name=nm;
}

public String getName(){
return name;
}

public boolean equals(Object obj){
if(this==obj)return true;
if(!(obj instanceof Source)) return false;
Source obj1=(Source)obj;
return ((obj1.name).equalsIgnoreCase(this.name));
}
public int hashcode(){
return name.hashCode();
}

 
}
public class RemoveDuplicates {
public static void main(String a[]){
HashSet<Source> set=new HashSet<Source>();
Source src1=new Source("AB");
Source src2=new Source("BC");
Source src3=new Source("AB");


set.add(src1);
set.add(src2);
set.add(src3);
System.out.println("Set contains "+set.contains(new Source("AB")));
Iterator itr=set.iterator();
Source s;
Integer i;

while(itr.hasNext()){
s=(Source)itr.next();
System.out.println(s.getName());
}
}
 
}
 

Why am I able to add duplicate objects(AB), while java api says, set does not allow duplicates.

Please advice.

Thanks

[Christophe Verré]

hashCode

[Ruchika Kapoor]

thanks Christophe !