java Java Guava | Booleans.indexOf(布尔[]数组，布尔[]目标)方法，示例

Java Guava | Booleans.indexOf(布尔[]数组，布尔[]目标)方法，示例

原文:https://www . geesforgeks . org/Java-guava-booleans-indexofboolean-array-boolean-target-method-with-examples/

Booleans.indexOf(布尔[]数组，布尔[]目标)法番石榴的 Booleans 类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的开始位置。如果数组中不存在目标，则该方法返回 -1 。

*语法:*

public static int indexOf(boolean[] array,
                          boolean[] target)

*参数:*该方法接受两个参数:

*Array: An array searches for the sequence target. Target: The array to be searched as a subsequence of the array.*

*返回值:*该方法返回:

目标第一次出现的起始位置，如果目标存在于数组中。
-1 如果目标不在阵列中。

*异常:*该方法不抛出任何异常。

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");
        }
    }
}