Guava庫中Doubles類的lastIndexOf()方法用於在double數組中查找給定double值的最後一個索引。要搜索的double值和要在其中搜索double的double數組均作為參數傳遞給此方法。它返回一個整數值,該整數值是指定的double值的最後一個索引。如果找不到該值,則返回-1。
用法:
public static int lastIndexOf(double[] array, double target)
參數:此方法接受兩個強製性參數:
- array:這是要在其中搜索double值的double值的數組。
- target:要在double數組中查找最後一個索引的double值。
返回值:此方法返回一個整數值,該整數值是指定的double值的最後一個索引。如果找不到該值,則返回-1。
下麵的程序演示了此方法:
範例1:
// Java code to show implementation of
// Guava's Doubles.lastIndexOf() method
import com.google.common.primitives.Doubles;
import java.util.Arrays;
class GFG {
// Driver's code
public static void main(String[] args)
{
// Creating a double array
double[] arr = { 1.2, 2.2, 3.2, 4.2,
3.2, 5.6, 3.2, 4.4 };
double target = 3.2;
// Using Doubles.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
= Doubles.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");
}
}
}
輸出:
Target is present at index 6
範例2:
// Java code to show implementation of
// Guava's Doubles.lastIndexOf() method
import com.google.common.primitives.Doubles;
import java.util.Arrays;
class GFG {
// Driver's code
public static void main(String[] args)
{
// Creating a double array
double[] arr = { 1.2, 2.2, 3.2, 4.2,
3.2, 5.6, 3.2, 4.4 };
double target = 10.2;
// Using Doubles.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
= Doubles.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");
}
}
}
輸出:
Target is not present in the array
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注:本文由純淨天空篩選整理自Sahil_Bansall大神的英文原創作品 Java Guava | Doubles.lastIndexOf() method with Examples。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。