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Scala TreeSet diff() method with example
• Last Updated : 21 Nov, 2019

The diff() method is used to find the difference between the two TreeSet. It deletes elements that are present in one TreeSet from the other one.

Method Definition: def diff[B >: A](that: collection.Seq[B]): TreeSet[A]

Return Type: It returns a new TreeSet which consists of elements after the difference between the two given TreeSet.

Example #1:

 `// Scala program of diff()  ` `// method  ` ` `  `// Import TreeSet ` `import` `scala.collection.mutable.``_` ` `  `// Creating object  ` `object` `GfG  ` `{  ` ` `  `    ``// Main method  ` `    ``def` `main(args``:``Array[String])  ` `    ``{  ` `     `  `        ``// Creating TreeSet ` `        ``val` `t``1` `=` `TreeSet(``1``, ``2``, ``3``, ``4``, ``5``)   ` `           `  `        ``val` `t``2` `=` `TreeSet(``3``, ``4``, ``5``)   ` `           `  `        ``// Print the TreeSet  ` `        ``println(``"TreeSet_1: "` `+ t``1``)  ` `           `  `        ``println(``"TreeSet_2: "` `+ t``2``)  ` `           `  `        ``// Applying diff method   ` `        ``val` `result ``=` `t``1``.diff(t``2``)   ` `           `  `        ``// Displays output   ` `        ``print(``"(TreeSet_1 - TreeSet_2): "` `+ result)  ` `         `  `    ``}  ` `}  `

Output:

```TreeSet_1: TreeSet(1, 2, 3, 4, 5)
TreeSet_2: TreeSet(3, 4, 5)
(TreeSet_1 - TreeSet_2): TreeSet(1, 2)
```

Example #2:

 `// Scala program of diff()  ` `// method  ` ` `  `// Import TreeSet ` `import` `scala.collection.mutable.``_` ` `  `// Creating object  ` `object` `GfG  ` `{  ` ` `  `    ``// Main method  ` `    ``def` `main(args``:``Array[String])  ` `    ``{  ` `     `  `        ``// Creating TreeSet ` `        ``val` `t``1` `=` `TreeSet(``1``, ``2``, ``3``, ``4``, ``5``)   ` `           `  `        ``val` `t``2` `=` `TreeSet(``3``, ``4``, ``5``, ``6``, ``7``, ``8``)   ` `           `  `        ``// Print the TreeSet  ` `        ``println(``"TreeSet_1: "` `+ t``1``)  ` `           `  `        ``println(``"TreeSet_2: "` `+ t``2``)  ` `           `  `        ``// Applying diff method   ` `        ``val` `result ``=` `t``2``.diff(t``1``)   ` `           `  `        ``// Displays output   ` `        ``print(``"(TreeSet_2 - TreeSet_1): "` `+ result)  ` `         `  `    ``}  ` `}  `

Output:

```TreeSet_1: TreeSet(1, 2, 3, 4, 5)
TreeSet_2: TreeSet(3, 4, 5, 6, 7, 8)
(TreeSet_2 - TreeSet_1): TreeSet(6, 7, 8)
```

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