Java - How to create new Entry (key, value)

Question

I\'d like to create new item that similarly to Util.Map.Entry that will contain the structure key, value.

The problem is that

Answer 1

Example of AbstractMap.SimpleEntry:

import java.util.Map; 
import java.util.AbstractMap;
import java.util.AbstractMap.SimpleEntry;

Instantiate:

ArrayList> arr = 
    new ArrayList>();

Add rows:

arr.add(new AbstractMap.SimpleEntry(2, 3));
arr.add(new AbstractMap.SimpleEntry(20, 30));
arr.add(new AbstractMap.SimpleEntry(2, 4));

Fetch rows:

System.out.println(arr.get(0).getKey());
System.out.println(arr.get(0).getValue());
System.out.println(arr.get(1).getKey());
System.out.println(arr.get(1).getValue());
System.out.println(arr.get(2).getKey());
System.out.println(arr.get(2).getValue());

Should print:

2
3
20
30
2
4

It's good for defining edges of graph structures. Like the ones between neurons in your head.