Guava Longs类
Longs 是一个用于原始类型long的实用类。它提供了Long或Arrays中没有的与long基元相关的静态实用方法。
声明 :
@GwtCompatible(emulated=true)
public final class Longs
extends Object
下表显示了Guava Longs类的字段摘要 :
Guava Longs类提供的一些方法是 。
异常 :
- min : 如果数组是空的,会出现IllegalArgumentException。
- max : 如果数组是空的,会出现IllegalArgumentException。
- fromByteArray : 如果字节数少于8个元素,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,则会出现NullPointerException。
下表显示了Guava Longs类提供的其他一些方法:
下面给出了一些例子,显示了Guava Longs类方法的实现:
例子1:
// Java code to show implementation
// of Guava Longs.asList() method
import com.google.common.primitives.Longs;
import java.util.*;
class GFG {
// Driver method
public static void main(String[] args)
{
long arr[] = { 3L, 4L, 5L, 6L, 7L };
// Using Longs.asList() method which wraps
// the primitive long array as List of
// long Type
List<Long> myList = Longs.asList(arr);
// Displaying the elements
System.out.println(myList);
}
}
输出:
[3, 4, 5, 6, 7]
例子2:
// Java code to show implementation
// of Guava Longs.toArray() method
import com.google.common.primitives.Longs;
import java.util.*;
class GFG {
// Driver method
public static void main(String[] args)
{
List<Long> myList = Arrays.asList(3L, 4L, 5L, 6L, 7L);
// Using Longs.toArray() method which
// converts a List of Longs to an
// array of long
long[] arr = Longs.toArray(myList);
// Displaying the elements
System.out.println(Arrays.toString(arr));
}
}
输出:
[3, 4, 5, 6, 7]
例子3:
// Java code to show implementation
// of Guava Longs.concat() method
import com.google.common.primitives.Longs;
import java.util.*;
class GFG {
// Driver method
public static void main(String[] args)
{
long[] arr1 = { 3L, 4L, 5L };
long[] arr2 = { 6L, 7L };
// Using Longs.concat() method which
// combines arrays from specified
// arrays into a single array
long[] arr = Longs.concat(arr1, arr2);
// Displaying the elements
System.out.println(Arrays.toString(arr));
}
}
输出:
[3, 4, 5, 6, 7]
例子4:
// Java code to show implementation
// of Guava Longs.contains() method
import com.google.common.primitives.Longs;
class GFG {
// Driver method
public static void main(String[] args)
{
long[] arr = { 3L, 4L, 5L, 6L };
// Using Longs.contains() method which
// checks if element is present in array
// or not
System.out.println(Longs.contains(arr, 4L));
System.out.println(Longs.contains(arr, 7L));
}
}
输出:
true
false
例子5:
// Java code to show implementation
// of Guava Longs.min() method
import com.google.common.primitives.Longs;
class GFG {
// Driver method
public static void main(String[] args)
{
long[] arr = { 3L, 4L, 5L, 6L };
// Using Longs.min() method
System.out.println(Longs.min(arr));
}
}
输出:
3
例子6:
// Java code to show implementation
// of Guava Longs.max() method
import com.google.common.primitives.Longs;
class GFG {
// Driver method
public static void main(String[] args)
{
long[] arr = { 3L, 4L, 5L, 6L };
// Using Longs.max() method
System.out.println(Longs.max(arr));
}
}
输出:
6