Java Guava Doubles.contains()用法及代碼示例

Guava庫中Doubles類的contains()方法用於檢查指定的雙精度值數組中是否存在指定的值。要搜索的double值和要在其中搜索double的double數組都被當作參數。

用法:

public static boolean contains(double[] array,
                               double target)

參數：此方法接受兩個強製性參數：

array:這是一個雙精度值數組，將在其中搜索目標值。
target:這是要搜索數組中是否存在的雙精度值。

返回值：此方法返回一個布爾值，該布爾值說明在指定的double數組中是否存在目標double值。如果目標值存在於數組中，則返回True。否則返回False。

以下示例程序旨在說明contains()方法的使用：

範例1：

// Java code to show implementation of 
// Guava's Doubles.contains() 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 = { 5.2, 4.2, 3.4, 2.3, 1.5 }; 
  
        double target = 3.4; 
  
        // Using Doubles.contains() method to search 
        // for an element in the array. The method 
        // returns true if element is found, else 
        // returns false 
        if (Doubles.contains(arr, target)) 
            System.out.println("Target is present"
                               + " in the array"); 
        else
            System.out.println("Target is not present"
                               + " in the array"); 
    } 
}

輸出：

Target is present in the array

範例2：

// Java code to show implementation of 
// Guava's Doubles.contains() 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 = { 2.3, 4.4, 6.5, 8.6, 10.7 }; 
  
        double target = 7.5; 
  
        // Using Doubles.contains() method to search 
        // for an element in the array. The method 
        // returns true if element is found, else 
        // returns false 
        if (Doubles.contains(arr, target)) 
            System.out.println("Target is present"
                               + " in the array"); 
        else
            System.out.println("Target is not present"
                               + " in the array"); 
    } 
}

輸出：

Target is not present in the array

參考：
https://google.github.io/guava/releases/19.0/api/docs/com/google/common/primitives/Doubles.html#contains(double[], %20double)

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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.contains() 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。