Java番石榴 |带有示例的 Doubles.concat() 方法
Guava 库中 Doubles 类的concat()方法用于将多个数组的值连接成一个数组。这些要连接的双精度数组被指定为此方法的参数。
For example: concat(new double[] {a, b}, new double[] {}, new double[] {c}
returns the array {a, b, c}.
句法:
public static double[] concat(double[]... arrays)
参数:此方法接受数组作为参数,该参数是此方法要连接的双精度数组。
返回值:此方法返回单个双精度数组,其中包含所有指定双精度数组值的原始顺序。
下面的程序说明了 concat() 方法的使用:
示例 1:
// Java code to show implementation of
// Guava's Doubles.concat() method
import com.google.common.primitives.Doubles;
import java.util.Arrays;
class GFG {
// Driver's code
public static void main(String[] args)
{
// Creating 2 Double arrays
double[] arr1 = { 1.2, 2.3, 3.5, 4.4, 5.1 };
double[] arr2 = { 6.2, 2.1, 7.2, 0.4, 8.7 };
// Using Doubles.concat() method to combine
// elements from both arrays into a single array
double[] res = Doubles.concat(arr1, arr2);
// Displaying the single combined array
System.out.println(Arrays.toString(res));
}
}
输出:
[1.2, 2.3, 3.5, 4.4, 5.1, 6.2, 2.1, 7.2, 0.4, 8.7]
示例 2:
// Java code to show implementation of
// Guava's Doubles.concat() method
import com.google.common.primitives.Doubles;
import java.util.Arrays;
class GFG {
// Driver's code
public static void main(String[] args)
{
// Creating 4 Double arrays
double[] arr1 = { 1.2, 2.3, 3.4 };
double[] arr2 = { 4.5, 5.6 };
double[] arr3 = { 6.4, 7.6, 8.7 };
double[] arr4 = { 9.7, 0.8 };
// Using Doubles.concat() method to combine
// elements from both arrays into a single array
double[] res
= Doubles.concat(arr1, arr2, arr3, arr4);
// Displaying the single combined array
System.out.println(Arrays.toString(res));
}
}
输出:
[1.2, 2.3, 3.4, 4.5, 5.6, 6.4, 7.6, 8.7, 9.7, 0.8]
参考: https://google.github.io/guava/releases/19.0/api/docs/com/google/common/primitives/Doubles.html#concat(double[]…)