Guava – Booleans.indexOf方法及示例
Guava的Booleans.indexOf(boolean[] array, boolean[] target)方法接受两个参数数组和目标。如果目标存在于数组中，该方法返回其第一次出现的起始位置。如果目标在数组中不存在，该方法返回-1。
语法：
public static int indexOf(boolean[] array, boolean[] target)
参数：该方法接受两个参数。
array： 一个用于搜索序列目标的数组。target： 一个要搜索的数组，作为数组的子序列。返回值： 该方法返回。
如果目标存在于数组中，则为目标第一次出现的起始位置。如果目标在阵列中不存在，则为-1。异常情况: 该方法没有抛出任何异常。
下面的例子说明了上述方法的实现。
例1:
// Java code to show implementation of// Guava's Booleans.indexOf(boolean[] array,// boolean[] target) method import com.google.common.primitives.Booleans;import java.util.Arrays; class GFG { // Driver's code public static void main(String[] args) { // Creating a boolean array boolean[] arr = { false, true, false, false, true }; boolean[] target = { false, false }; // Using indexOf(boolean[] array, boolean[] target) // method to get the start position of the first // occurrence of the specified target within array, // or -1 if there is no such occurrence. int index = Booleans.indexOf(arr, target); if (index != -1) { System.out.println("Target is present at index " + index); } else { System.out.println("Target is not present " + "in the array"); } }}
例2 :
// Java code to show implementation of// Guava's Booleans.indexOf(boolean[] array,// boolean[] target) method import com.google.common.primitives.Booleans;import java.util.Arrays; class GFG { // Driver's code public static void main(String[] args) { // Creating a boolean array boolean[] arr = { false, true, false, false, true }; boolean[] target = { false, false, false }; // Using indexOf(boolean[] array, boolean[] target) // method to get the start position of the first // occurrence of the specified target within array, // or -1 if there is no such occurrence. int index = Booleans.indexOf(arr, target); if (index != -1) { System.out.println("Target is present at index " + index); } else { System.out.println("Target is not present " + "in the array"); } }}
参考资料:
https://google.github.io/guava/releases/20.0/api/docs/com/google/common/primitives/Booleans.html#indexOf-boolean:A-boolean:A-
