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 :
Ints类提供的一些方法是 :
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:
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