Java to find out and avoid duplicate string

Question

In my project I use employee bean list in the list empVal string value contain 01,02,03,05 in the same I need to avoid in another string

i.e in first bean emp1.empval="01,02,03,05" and second bean emp2.empval=" 01,02,03,05". So emp2.empval should not be allowed as bean value numbers are present in emp2. empval is already exists in emp1.empval.

pulblic class employee
{
  private String empVal;
  ......
}

my doubt is how to achieve it either using iterate or split to compare string or any other way is possible?

The content of your question doesn´t really make it clear what you are trying to achive and due to this it is unclear what you are asking. — SomeJavaGuy, Aug 11 '16 at 07:10
tip: [**`String::contains`**](https://docs.oracle.com/javase/7/docs/api/java/lang/String.html#contains(java.lang.CharSequence)) — Jordi Castilla, Aug 11 '16 at 07:10
Are you trying to ask that "How to avoid same empVal in two employee object"? — Shahid, Aug 11 '16 at 07:19

score 1 · Answer 1 · edited May 23 '17 at 12:32

You can override the equals method and check

 @Override
public boolean equals(Object obj) {
    if(obj instanceof employee){
        employee emp= (employee) obj;
        if(this.empVal.equals(emp.empVal){
            return true;
        }
    }
    return false;
}

and then before adding the elements you can check, also you can add the other variables you have declared in you class if(emp!= null && this.empVal.equals(emp.empVal) && this.empVal1.equals(emp.empVal1))

For eg:
ArrayList<employee> empList= new ArrayList<employee> (); employee emp1 = new employee ("a"); employee emp2 = new employee ("b"); employee emp3 = new employee ("b"); empList.add(emp1); empList.add(emp2); if(empList.contains(emp3)) { System.out.println("Yes"); } else { System.out.println("No"); empList.add(emp3); //Adding if that object is not present in the list. }

Basically contains method will check if the object is present by internally calling the equals method.

For more information on contains functionality you can check the link How does a ArrayList's contains() method evaluate objects?

as a sidenode, `obj instanceof employee` already does a `null` check, so `emp!= null` is quite unnecessary. — SomeJavaGuy, Aug 11 '16 at 07:36

Veeresh123 · Answer 2 · 2016-08-11T07:39:18.673

0

Hi you can achive this by

 Boolean valueExists = emp1.empVal.equals(emp2.empVal);

edited Aug 11 '16 at 07:39

answered Aug 11 '16 at 07:31

Veeresh123

87
16

I need compare every value i.e first val 01,02,03 and second val as 03,04,05 . 03 present in both the string – arun kumar Aug 11 '16 at 07:40
use string.split(",") in order to split the string and store in arrayList and then you can compare those. – Veeresh123 Aug 11 '16 at 07:59

Java to find out and avoid duplicate string

2 Answers2