Guava Doubles Class的Doubles.indexOf(double [] array,double [] target)方法接受兩個參數array和target。如果目標存在於數組中,則該方法返回其首次出現的開始位置。如果目標在數組中不存在,則該方法返回-1。
用法:
public static int indexOf(double[] array, double[] target)
參數:該方法接受兩個參數:
- array:這是要在其中檢查目標數組的索引的整數數組。
- target:將要搜索的數組作為指定數組的sub-sequence。
返回值:該方法返回一個整數值,如下所示:
- 如果目標數組中存在目標數組,它將返回目標第一次出現的起始位置。
- 否則,如果目標在數組中不存在,則返回-1。
異常:該方法不會引發任何異常。
以下示例說明了上述方法的實現:
範例1:
// Java code to show implementation of
// Guava's Doubles.indexOf(double[] array,
// double[] target) method
import com.google.common.primitives.Doubles;
import java.util.Arrays;
class GFG {
// Driver's code
public static void main(String[] args)
{
// Creating an double array
double[] arr = { 1.2, 2.3, 3.4,
4.5, 3.4, 5.6 };
double[] target = { 3.4, 4.5, 3.4 };
System.out.println("Array:"
+ Arrays.toString(arr));
System.out.println("Target Array:"
+ Arrays.toString(target));
// Using Doubles.indexOf(double[] array, double[] 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 = Doubles.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");
}
}
}
輸出:
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
範例2:
// Java code to show implementation of
// Guava's Doubles.indexOf(double[] array,
// double[] target) method
import com.google.common.primitives.Doubles;
import java.util.Arrays;
class GFG {
// Driver's code
public static void main(String[] args)
{
// Creating an double array
double[] arr = { 3.2, 5.3, 7.4,
11.4, 13.5 };
double[] target = { 17.5, 12.4 };
System.out.println("Array:"
+ Arrays.toString(arr));
System.out.println("Target Array:"
+ Arrays.toString(target));
// Using Doubles.indexOf(double[] array, double[] 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 = Doubles.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");
}
}
}
輸出:
Array:[3.2, 5.3, 7.4, 11.4, 13.5] Target Array:[17.5, 12.4] Target is not present in the array
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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.indexOf(double[] array, double[] target) 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。