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# Scala immutable TreeSet sum() method

• Last Updated : 19 Apr, 2020

In Scala immutable TreeSet class the sum() method is utilized to return the sum of all the elements of the TreeSet.

Method Definition: def sum: A

Return Type: It returns the sum of all the elements of the TreeSet.

Example #1:

 `// Scala program of sum() ``// method `` ` `// Import TreeSet``import` `scala.collection.immutable.``_`` ` `// Creating object ``object` `GfG ``{ `` ` `    ``// Main method ``    ``def` `main(args``:``Array[String]) ``    ``{ ``     ` `        ``// Creating TreeSet``        ``val` `t``1` `=` `TreeSet(``3``, ``1``, ``5``, ``2``, ``4``)  ``           ` `        ``// Print the TreeSet ``        ``println(t``1``) ``         ` `        ``// Applying sum method  ``        ``val` `result ``=` `t``1``.sum``           ` `        ``// Displays output  ``        ``print(``"Sum of all the elements of the TreeSet: "` `+ result) ``         ` `    ``} ``} `
Output:
```TreeSet(1, 2, 3, 4, 5)
Sum of all the elements of the TreeSet: 15
```

Example #2:

 `// Scala program of sum() ``// method `` ` `// Import TreeSet``import` `scala.collection.immutable.``_`` ` `// Creating object ``object` `GfG ``{ `` ` `    ``// Main method ``    ``def` `main(args``:``Array[String]) ``    ``{ ``     ` `        ``// Creating TreeSet``        ``val` `t``1` `=` `TreeSet(``3``, ``1``, ``5``, ``7``, ``9``)  ``           ` `        ``// Print the TreeSet ``        ``println(t``1``) ``         ` `        ``// Applying sum method  ``        ``val` `result ``=` `t``1``.sum``           ` `        ``// Displays output  ``        ``print(``"Sum of all the elements of the TreeSet: "` `+ result) ``         ` `    ``} ``} `
Output:
```TreeSet(1, 3, 5, 7, 9)
Sum of all the elements of the TreeSet: 25
```

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