Java 番石榴| Longs.indexOf(long[]数组，long target)方法示例
Longs.indexOf(长[]阵，长目标)法番石榴的 Longs 类接受两个参数T5】阵 T7】和T9】目标 T11】。如果目标存在于数组中，该方法返回其第一次出现的的位置。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 target)*
*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:*是在指定数组中作为元素搜索的值。
*返回值:*该方法返回一个整数值如下:
If the target exists in the array, the position where the target first appears is returned. 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;
System.out.println("Array: "
+ Arrays.toString(arr));
System.out.println("Target: " + target);
// Using Longs.indexOf(long[] array, long target)
// method to get the 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: 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;
System.out.println("Array: "
+ Arrays.toString(arr));
System.out.println("Target: " + 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: 23
Target is not present in the array
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