Java番石榴 |带有示例的 Floats.lastIndexOf() 方法

Guava 库中Floats 类的lastIndexOf()方法用于查找给定浮点值在浮点数组中的最后一个索引。这个要搜索的浮点值和要在其中搜索的浮点数组，都作为参数传递给这个方法。它返回一个整数值，它是指定浮点值的最后一个索引。如果未找到该值，则返回 -1。

句法：

public static int lastIndexOf(float[] array,
                              float target)

参数：此方法接受两个强制参数：

• 数组：这是要在其中搜索浮点值的浮点值数组。
• 目标：这是要在浮点数组中搜索最后一个索引的浮点值。

返回值：此方法返回一个整数值，它是指定浮点值的最后一个索引。如果未找到该值，则返回 -1。

下面的程序说明了这种方法：

示例 1：

// Java code to show implementation of
// Guava's Floats.lastIndexOf() method
  
import com.google.common.primitives.Floats;
import java.util.Arrays;
  
class GFG {
  
    // Driver's code
    public static void main(String[] args)
    {
  
        // Creating a float array
        float[] arr = { 1.2f, 2.2f, 3.2f, 4.2f,
                        3.2f, 5.6f, 3.2f, 4.4f };
  
        float target = 3.2f;
  
        // Using Floats.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
            = Floats.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

示例 2：

// Java code to show implementation of
// Guava's Floats.lastIndexOf() method
  
import com.google.common.primitives.Floats;
import java.util.Arrays;
  
class GFG {
  
    // Driver's code
    public static void main(String[] args)
    {
        // Creating a float array
        float[] arr = { 1.2f, 2.2f, 3.2f, 4.2f,
                        3.2f, 5.6f, 3.2f, 4.4f };
  
        float target = 10.2f;
  
        // Using Floats.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
            = Floats.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

参考： https://google.github.io/guava/releases/19.0/api/docs/com/google/common/primitives/Floats.html#lastIndexOf(float[], %20float)