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How to Find the Minimum and Maximum Value from Java HashSet?
• Last Updated : 28 Dec, 2020

HashSet is used to store distinct values in Java. The HashSet does not guarantee the constant order of elements over time, which means when we iterate a HashSet, there is no guarantee that we get the same order of elements as we added in order. HashSet does not provide any built-in method to get the maximum and minimum values.

There are a couple of ways to find the maximum and minimum from the HashSet in Java:

1. Using Collection class
2. Using simple iteration

Method 1: Using Collections class

Using Collections class in Java we can find maximum and minimum value with the help of max() and min() method of Collections class.

Code:

## Java

 `// Java code to find the maximum and minimum in HashSet`` ` `import` `java.util.*;`` ` `public` `class` `GFG {``    ``public` `static` `void` `main(String[] args)``    ``{`` ` `        ``// New HashSet``        ``HashSet set = ``new` `HashSet<>();`` ` `        ``// Add data to Hashset``        ``set.add(``10``);``        ``set.add(``20``);``        ``set.add(``20``);``        ``set.add(``10``);``        ``set.add(``50``);``        ``set.add(``40``);`` ` `        ``// Print Maximum value using max method of``        ``// Collections class``        ``System.out.println(``"Maximum value of HashSet : "``                           ``+ Collections.max(set));`` ` `        ``// Print Maximum value using max method of``        ``// Collections class``        ``System.out.println(``"Minimum value of HashSet : "``                           ``+ Collections.min(set));``    ``}``}`
Output
```Maximum value of HashSet : 50
Minimum value of HashSet : 10```

Method 2: Using Simple Iteration

We can find Maximum and Minimum using simply iterate the HashSet and maintain the min and max variable and update it accordingly while traversing through each element and comparing it with the min and max values.

Code:

## Java

 `// Java code to find the maximum and minimum in HashSet`` ` `import` `java.util.*;`` ` `public` `class` `GFG {``    ``public` `static` `void` `main(String[] args)``    ``{`` ` `        ``// New HashSet``        ``HashSet set = ``new` `HashSet<>();`` ` `        ``// Add data to Hashset``        ``set.add(``10``);``        ``set.add(``20``);``        ``set.add(``20``);``        ``set.add(``10``);``        ``set.add(``50``);``        ``set.add(``40``);`` ` `        ``int` `max = -``1``, min = -``1``;`` ` `        ``// Iterate HashSet to get Maximum value``        ``for` `(``int` `val : set) {``            ``if` `(max == -``1``) {``                ``max = val;``            ``}``            ``else` `if` `(val > max) {``                ``max = val;``            ``}``        ``}`` ` `        ``// Iterate HashSet to get Minimum value``        ``for` `(``int` `val : set) {``            ``if` `(min == -``1``) {``                ``min = val;``            ``}``            ``else` `if` `(val < min) {``                ``min = val;``            ``}``        ``}`` ` `        ``// Print Maximum value using max method of``        ``// Collections class``        ``System.out.println(``"Maximum value of HashSet : "``                           ``+ max);`` ` `        ``// Print Maximum value using max method of``        ``// Collections class``        ``System.out.println(``"Minimum value of HashSet : "``                           ``+ min);``    ``}``}`
Output
```Maximum value of HashSet : 50
Minimum value of HashSet : 10```

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