双打班 |番石榴 |Java
Doubles是原始类型double的实用程序类。它提供了与双原语有关的静态实用方法,这些方法在双精度或数组中都没有。
宣言 :
@GwtCompatible(emulated=true)
public final class Doubles
extends Object
下表显示了番石榴双打类的字段摘要:
Guava Doubles Class 提供的一些方法是:
例外:
- min : IllegalArgumentException如果数组为空。
- max : IllegalArgumentException如果数组为空。
- ensureCapacity : IllegalArgumentException如果 minLength 或 padding 为负数。
- toArray : NullPointerException如果集合或其任何元素为空。
下表显示了 Guava Doubles Class 提供的其他一些方法:
下面给出了一些示例,展示了 Guava Doubles Class 方法的实现:
示例 1:
// Java code to show implementation
// of Guava Doubles.asList() method
import com.google.common.primitives.Doubles;
import java.util.*;
class GFG {
// Driver method
public static void main(String[] args)
{
double arr[] = { 2.6, 4.6, 1.2, 2.4, 1.5 };
// Using Doubles.asList() method which
// converts array of primitives to array of objects
List myList = Doubles.asList(arr);
// Displaying the elements
System.out.println(myList);
}
}
输出 :
[2.6, 4.6, 1.2, 2.4, 1.5]
示例 2:
// Java code to show implementation
// of Guava Doubles.toArray() method
import com.google.common.primitives.Doubles;
import java.util.*;
class GFG {
// Driver method
public static void main(String[] args)
{
List myList = Arrays.asList(2.6, 4.6, 1.2, 2.4, 1.5);
// Using Doubles.toArray() method which
// converts a List of Doubles to an
// array of double
double[] arr = Doubles.toArray(myList);
// Displaying the elements
System.out.println(Arrays.toString(arr));
}
}
输出 :
[2.6, 4.6, 1.2, 2.4, 1.5]
示例 3:
// Java code to show implementation
// of Guava Doubles.concat() method
import com.google.common.primitives.Doubles;
import java.util.*;
class GFG {
// Driver method
public static void main(String[] args)
{
double[] arr1 = { 2.6, 4.6, 1.2 };
double[] arr2 = { 2.4, 1.5 };
// Using Doubles.concat() method which
// combines arrays from specified
// arrays into a single array
double[] arr = Doubles.concat(arr1, arr2);
// Displaying the elements
System.out.println(Arrays.toString(arr));
}
}
输出 :
[2.6, 4.6, 1.2, 2.4, 1.5]
示例 4:
// Java code to show implementation
// of Guava Doubles.contains() method
import com.google.common.primitives.Doubles;
class GFG {
// Driver method
public static void main(String[] args)
{
double[] arr = { 2.6, 4.6, 1.2, 2.4, 1.5 };
// Using Doubles.contains() method which
// checks if element is present in array
// or not
System.out.println(Doubles.contains(arr, 2.5));
System.out.println(Doubles.contains(arr, 1.5));
}
}
输出 :
false
true
示例 5:
// Java code to show implementation
// of Guava Doubles.min() method
import com.google.common.primitives.Doubles;
class GFG {
// Driver method
public static void main(String[] args)
{
double[] arr = { 2.6, 4.6, 1.2, 2.4, 1.5 };
// Using Doubles.min() method
System.out.println(Doubles.min(arr));
}
}
输出 :
1.2
示例 6:
// Java code to show implementation
// of Guava Doubles.max() method
import com.google.common.primitives.Doubles;
class GFG {
// Driver method
public static void main(String[] args)
{
double[] arr = { 2.6, 4.6, 1.2, 2.4, 1.5 };
// Using Doubles.max() method
System.out.println(Doubles.max(arr));
}
}
输出 :
4.6