Guava – Longs.concat()方法及实例
Guava库中Longs类的concat()方法是用来将许多数组的值串联成一个单一的数组。这些要串联的长数组被指定为该方法的参数。
例如：concat(new long[] {1, 2}, new long[] {3, 4, 5}, new long[] {6, 7} 返回数组{1, 2, 3, 4, 5, 6, 7}。
语法：
public static long[] concat(long[]... arrays)
参数： 该方法接受数组作为参数，该数组是要被该方法连接的长数组。
返回值： 该方法返回一个单一的长数组，其中包含所有指定的长数组值的原始顺序。
下面的程序说明了concat()方法的使用。
例1:
// Java code to show implementation of// Guava's Longs.concat() method import com.google.common.primitives.Longs;import java.util.Arrays; class GFG { // Driver's code public static void main(String[] args) { // Creating 2 Long arrays long[] arr1 = { 1, 2, 3, 4, 5 }; long[] arr2 = { 6, 2, 7, 0, 8 }; System.out.println("Long Array 1: " + Arrays.toString(arr1)); System.out.println("Long Array 2: " + Arrays.toString(arr2)); // Using Longs.concat() method to combine // elements from both arrays // into a single array long[] res = Longs.concat(arr1, arr2); // Displaying the single combined array System.out.println("Combined Array: " + Arrays.toString(res)); }}
输出:
Long Array 1: [1, 2, 3, 4, 5]Long Array 2: [6, 2, 7, 0, 8]Combined Array: [1, 2, 3, 4, 5, 6, 2, 7, 0, 8]
例2:
// Java code to show implementation of// Guava's Longs.concat() method import com.google.common.primitives.Longs;import java.util.Arrays; class GFG { // Driver's code public static void main(String[] args) { // Creating 4 long arrays long[] arr1 = { 1, 2, 3 }; long[] arr2 = { 4, 5 }; long[] arr3 = { 6, 7, 8 }; long[] arr4 = { 9, 0 }; System.out.println("Long Array 1: " + Arrays.toString(arr1)); System.out.println("Long Array 2: " + Arrays.toString(arr2)); System.out.println("Long Array 3: " + Arrays.toString(arr3)); System.out.println("Long Array 4: " + Arrays.toString(arr4)); // Using Longs.concat() method to combine // elements from both arrays // into a single array long[] res = Longs .concat(arr1, arr2, arr3, arr4); // Displaying the single combined array System.out.println("Combined Array: " + Arrays.toString(res)); }}
输出:
Long Array 1: [1, 2, 3]Long Array 2: [4, 5]Long Array 3: [6, 7, 8]Long Array 4: [9, 0]Combined Array: [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]
参考资料:
https://google.github.io/guava/releases/21.0/api/docs/com/google/common/primitives/Longs.html#concat-long:A…-
