Java 番石榴| Booleans.lastIndexOf()方法，带示例
原文:https://www . geesforgeks . org/Java-guava-booleans-last indexof-method-with-examples/
番石榴库中 布尔类 的 lastIndexOf() 方法用于查找布尔数组中给定布尔值的最后一个索引。要搜索的布尔值和要搜索的布尔数组都作为参数传递给此方法。它返回一个整数值，这是指定布尔值的最后一个索引。如果找不到该值，它将返回-1。
语法:
public static int lastIndexOf(boolean[] array,
boolean target)
参数:该方法接受两个强制参数:
- Array: is an array of Boolean values to search for.
- Target: is the Boolean value to be searched by the last index in the Boolean array.
返回值:该方法返回一个整数值，该整数值是指定布尔值的最后一个索引。如果找不到该值，它将返回-1。
下面的程序说明了这种方法:
示例-1:
// Java code to show implementation of
// Guava's Booleans.lastIndexOf() 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 = { true, false, false,
true, true };
boolean target = true;
// Using Booleans.lastIndexOf() method
// to get the index of last appearance
// of a given element in array
// and return -1 if element
// is not found in the array
int index = Booleans.lastIndexOf(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");
}
}
}
输出:
Target is present at index 4
示例-2:
// Java code to show implementation of
// Guava's Booleans.lastIndexOf() 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 = { true, true, true,
true, true };
boolean target = false;
// Using Booleans.lastIndexOf() method to get the
// index of last appearance of a given element
// in array and return -1 if element is
// not found in the array
int index = Booleans.lastIndexOf(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");
}
}
}
输出:
Target is not present in the array
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