Java番石榴 | Floats.indexOf(float[] array, float[] target) 方法和示例
Guava 的 Floats 类的Floats.indexOf(float[] array, float[] target)方法接受两个参数array和target 。如果目标存在于数组中,则该方法返回其第一次出现的开始位置。如果数组中不存在目标,则该方法返回-1 。
句法:
public static int indexOf(float[] array, float[] target)
参数:该方法接受两个参数:
- 数组:这是要检查目标数组索引的整数数组。
- target:作为指定数组的子序列要搜索的数组。
返回值:该方法返回一个整数值,如下所示:
- 如果目标数组存在于数组中,则返回目标第一次出现的起始位置。
- 否则,如果数组中不存在目标,则返回-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:
示例 1:
// Java code to show implementation of
// Guava's Floats.indexOf(float[] array,
// float[] target) method
import com.google.common.primitives.Floats;
import java.util.Arrays;
class GFG {
// Driver's code
public static void main(String[] args)
{
// Creating an float array
float[] arr = { 1.2f, 2.3f, 3.4f,
4.5f, 3.4f, 5.6f };
float[] target = { 3.4f, 4.5f, 3.4f };
System.out.println("Array: "
+ Arrays.toString(arr));
System.out.println("Target Array: "
+ Arrays.toString(target));
// Using Floats.indexOf(float[] array, float[] 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 = Floats.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, 2.3, 3.4, 4.5, 3.4, 5.6]
Target Array: [3.4, 4.5, 3.4]
Target is present at index 2
示例 2:
// Java code to show implementation of
// Guava's Floats.indexOf(float[] array,
// float[] target) method
import com.google.common.primitives.Floats;
import java.util.Arrays;
class GFG {
// Driver's code
public static void main(String[] args)
{
// Creating an float array
float[] arr = { 3.2f, 5.3f, 7.4f,
11.4f, 13.5f };
float[] target = { 17.5f, 12.4f };
System.out.println("Array: "
+ Arrays.toString(arr));
System.out.println("Target Array: "
+ Arrays.toString(target));
// Using Floats.indexOf(float[] array, float[] 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 = Floats.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: [3.2, 5.3, 7.4, 11.4, 13.5]
Target Array: [17.5, 12.4]
Target is not present in the array
参考: https://google.github.io/guava/releases/22.0/api/docs/com/google/common/primitives/Floats.html#indexOf-float:A-float:A-