Formatting output for Printing pair in Java?

Question

I am trying to check my pair against a unit test but the output from the function returns the pair with pair values separated with "=" instead of ",". I tried type casting and other workarounds but can't figure out whats making this happen.

Function return type :

Pair<ArrayList<Pair<Entity, Integer>>, Integer>

ArrayList<Pair<Entity, Integer>> pairMatches = new ArrayList<Pair<Entity, Integer>>();

pairMatches.add(new Pair<>(entities.get(i-1), ped)); // entities is a class object

// Finally returning

return (new Pair<>(pairMatches, pedComputations)); // pedComputations and ped are Integer

Output reads : [Entity(name="frei", score=3, description="a word")=0]=1

Expected : ([(Entity(name="frei", score=3, description="a word"), 0)], 1)

@Override
public String toString() {
  return ("Entity(name=\"" + this.name + "\", score=" + this.score 
           + ", description=\"" + this.description + "\")");
}

Thank you !

@YCF_L I overrode toString for Entity class and its working fine, the standard output for pair is (value, value), do i need to override the toString() method ? — str. 0b11000, Nov 27 '17 at 19:48
please [edit](https://stackoverflow.com/posts/47518626/edit) your question and include your method — Youcef LAIDANI, Nov 27 '17 at 19:51
I suggest you try your own suggestion and override `toString()` in the `Pair` class. — D M, Nov 27 '17 at 20:09
I am using the standard Pair class from "javafx.util.Pair"; Not sure how to override it, already wasted hours on this, please help me. — str. 0b11000, Nov 27 '17 at 20:12

A.A · Accepted Answer · 2017-11-27T20:41:33.053

1

The problem lies within Pair class as you need to override toString() function in that class.

For example this code:

Pair<Integer, Integer> p = new Pair(1,2);
System.out.println(p);

will result in 1=2 being outputted.

You can either extend it the Pair class and just override toString() as your using javafx.util.Pair or create your own Pair class from scratch and override toString() there.

Example code on creating your own tuple can be found here

edited Nov 27 '17 at 20:41

answered Nov 27 '17 at 20:36

A.A

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@D M - Thank you, i finally did it the way you said, thanks for the advice. – str. 0b11000 Nov 27 '17 at 21:35
@PeteRene I'm not DM unless I missed something, but make sure you accept the answer that helped you via the green tick on the left – A.A Nov 27 '17 at 21:43
@PeteRene learn [How does accepting an answer work?](https://meta.stackexchange.com/questions/5234/how-does-accepting-an-answer-work) – Youcef LAIDANI Nov 28 '17 at 07:37

Formatting output for Printing pair in Java?

1 Answers1