Java 番石榴| Longs.indexOf(long[]数组，long[]目标)方法示例
原文:https://www . geesforgeks . org/Java-guava-longs-indexoflong-array-long-target-method-with-examples/
Longs.indexOf(long【】阵，long【】目标)法番石榴的 Longs 类接受两个参数 阵 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:*
*公共静态 int indexOf(long[]数组，long[]目标)*
*参数:*该方法接受两个参数:
- *数组:*是检查目标数组索引的整数数组。
- *目标:*作为指定数组的子序列进行搜索的数组。
*返回值:*该方法返回如下整数值:
If there is a target array in the array, return the starting position where the target first appears . Otherwise, if there is no target in the array, return -1 .
*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 Longs.indexOf(long[] array,
// long[] target) method
import com.google.common.primitives.Longs;
import java.util.Arrays;
class GFG {
// Driver's code
public static void main(String[] args)
{
// Creating an long array
long[] arr = { 1, 2, 3, 4, 3, 5 };
long[] target = { 3, 4, 3 };
System.out.println("Array: "
+ Arrays.toString(arr));
System.out.println("Target Array: "
+ Arrays.toString(target));
// Using Longs.indexOf(long[] array, long[] 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 = Longs.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");
}
}
}
**输出:
Array: [1, 2, 3, 4, 3, 5]
Target Array: [3, 4, 3]
Target is present at index 2
例 2:
// Java code to show implementation of
// Guava's Longs.indexOf(long[] array,
// long[] target) method
import com.google.common.primitives.Longs;
import java.util.Arrays;
class GFG {
// Driver's code
public static void main(String[] args)
{
// Creating an long array
long[] arr = { 3, 5, 7, 11, 13 };
long[] target = { 23, 37 };
System.out.println("Array: "
+ Arrays.toString(arr));
System.out.println("Target Array: "
+ Arrays.toString(target));
// Using Longs.indexOf(long[] array, long[] 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 = Longs.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");
}
}
}
输出:
Array: [3, 5, 7, 11, 13]
Target Array: [23, 37]
Target is not present in the array
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