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Ints Class | Guava | Java
  • Last Updated : 28 May, 2018

Ints is a utility class for primitive type int. It provides Static utility methods pertaining to int primitives, that are not already found in either Integer or Arrays.

Declaration :

@GwtCompatible(emulated=true)
public final class Ints
extends Object

Below table shows the Field summary for Guava Ints Class :

Some of the methods provided by Ints Class are :

Exceptions :

  • checkedCast : IllegalArgumentException if value is greater than Integer.MAX_VALUE or less than Integer.MIN_VALUE
  • min : IllegalArgumentException if array is empty.
  • max : IllegalArgumentException if array is empty.
  • fromByteArray : IllegalArgumentException if bytes has fewer than 4 elements.
  • ensureCapacity : IllegalArgumentException if minLength or padding is negative.
  • toArray : NullPointerException if collection or any of its elements is null.

Below table shows some other methods provided by Guava’s Ints Class :

Below given are some examples showing the implementation of methods of Guava’s Ints Class :
Example 1 :




// Java code to show implementation
// of Guava Ints.asList() method
  
import com.google.common.primitives.Ints;
import java.util.*;
  
class GFG {
    // Driver method
    public static void main(String[] args)
    {
        int arr[] = { 5, 10, 15, 20, 25 };
  
        // Using Ints.asList() method which wraps
        // the primitive integer array as List of
        // integer Type
        List<Integer> myList = Ints.asList(arr);
  
        // Displaying the elements
        System.out.println(myList);
    }
}

Output :



[5, 10, 15, 20, 25]

Example 2 :




// Java code to show implementation
// of Guava Ints.toArray() method
  
import com.google.common.primitives.Ints;
import java.util.*;
  
class GFG {
    // Driver method
    public static void main(String[] args)
    {
        List<Integer> myList = Arrays.asList(5, 10, 15, 20, 25);
  
        // Using Ints.toArray() method which
        // converts a List of Integer to an
        // array of int
        int[] arr = Ints.toArray(myList);
  
        // Displaying the elements
        System.out.println(Arrays.toString(arr));
    }
}

Output :

[5, 10, 15, 20, 25]

Example 3 :




// Java code to show implementation
// of Guava Ints.concat() method
  
import com.google.common.primitives.Ints;
import java.util.*;
  
class GFG {
    // Driver method
    public static void main(String[] args)
    {
        int[] arr1 = { 5, 10, 15 };
        int[] arr2 = { 20, 25 };
  
        // Using Ints.concat() method which
        // combines arrays from specified
        // arrays into a single array
        int[] arr = Ints.concat(arr1, arr2);
  
        // Displaying the elements
        System.out.println(Arrays.toString(arr));
    }
}

Output :

[5, 10, 15, 20, 25]

Example 4 :




// Java code to show implementation
// of Guava Ints.contains() method
  
import com.google.common.primitives.Ints;
  
class GFG {
    // Driver method
    public static void main(String[] args)
    {
        int[] arr = { 5, 10, 15, 20 };
  
        // Using Ints.contains() method which
        // checks if element is present in array
        // or not
        System.out.println(Ints.contains(arr, 10));
        System.out.println(Ints.contains(arr, 17));
    }
}

output :

true
false

Example 5 :




// Java code to show implementation
// of Guava Ints.min() method
  
import com.google.common.primitives.Ints;
  
class GFG {
    // Driver method
    public static void main(String[] args)
    {
        int[] arr = { 5, 10, 15, 20 };
  
        // Using Ints.min() method
        System.out.println(Ints.min(arr));
    }
}

Output :

5

Example 6 :




// Java code to show implementation
// of Guava Ints.max() method
  
import com.google.common.primitives.Ints;
  
class GFG {
    // Driver method
    public static void main(String[] args)
    {
        int[] arr = { 5, 10, 15, 20 };
  
        // Using Ints.max() method
        System.out.println(Ints.max(arr));
    }
}

Output :

20

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