Guava Ints类

Guava Ints类

Ints 是原始类型int的一个实用类。它提供了与int基元有关的静态实用方法,这些方法在Integer或Arrays中都没有找到。

声明 :

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

下表显示了Guava Ints类的字段摘要 :

Guava Ints类
Ints类提供的一些方法是 :

Guava Ints类
异常 :

  • checkedCast : 如果值大于Integer.MAX_VALUE或小于Integer.MIN_VALUE
  • min : 如果数组是空的,会出现IllegalArgumentException。
  • max : 如果数组为空,出现IllegalArgumentException。
  • fromByteArray : 如果字节的元素少于4个,则出现IllegalArgumentException。
  • ensureCapacity : 如果minLength或padding为负数,则出现IllegalArgumentException。
  • toArray : 如果集合或其任何元素为空,则出现NullPointerException。

下表显示了Guava的Ints类提供的其他一些方法:

Guava Ints类

下面给出了一些例子,显示了Guava的Ints类方法的实现:
例子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);
    }
}

输出:

[5, 10, 15, 20, 25]

例子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));
    }
}

输出:

[5, 10, 15, 20, 25]

例子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));
    }
}

输出:

[5, 10, 15, 20, 25]

例子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));
    }
}

输出:

true
false

例子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));
    }
}

输出:

5

例子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));
    }
}

输出:

20

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