爪哇番石榴| Longs.lastIndexOf()方法示例
原文:https://www . geesforgeks . org/Java-guava-longs-last indexof-method-with-examples/
番石榴库中 Longs 类 的 lastIndexOf() 方法用于查找长数组中给定长值的最后一个索引。要搜索的长值和要搜索的长数组都作为参数传递给此方法。它返回一个整数值，这是指定长值的最后一个索引。如果找不到该值，它将返回-1。
语法:
public static int lastIndexOf(long[] array,
long target)
参数:该方法接受两个强制参数:
- Array: is a long value array to search for long values.
- Target: is the long value of the last index to be searched in the long array.
返回值:该方法返回一个整数值，该整数值是指定长值的最后一个索引。如果找不到该值，它将返回-1。
下面的程序说明了这种方法:
例 1:
// Java code to show implementation of
// Guava's Longs.lastIndexOf() method
import com.google.common.primitives.Longs;
import java.util.Arrays;
class GFG {
// Driver's code
public static void main(String[] args)
{
// Creating a long array
long[] arr = { 1, 2, 3, 4, 3, 5, 3, 4 };
long target = 3;
// Using Longs.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
= Longs.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 6
例 2:
// Java code to show implementation of
// Guava's Longs.lastIndexOf() method
import com.google.common.primitives.Longs;
import java.util.Arrays;
class GFG {
// Driver's code
public static void main(String[] args)
{
// Creating a long array
long[] arr = { 3, 5, 7, 11, 13 };
long target = 17;
// Using Longs.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
= Longs.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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