Java Guava Booleans.lastIndexOf()用法及代碼示例

Guava庫中Booleans類的lastIndexOf()方法用於在布爾數組中查找給定布爾值的最後一個索引。此要搜索的布爾值和要在其中搜索的布爾數組都作為參數傳遞給此方法。它返回一個整數值，該整數值是指定布爾值的最後一個索引。如果找不到該值，則返回-1。

用法:

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

參數：此方法接受兩個強製性參數：

array:這是要在其中搜索布爾值的布爾值數組。
target:這是要在布爾數組中搜索最後一個索引的布爾值。

返回值：此方法返回一個整數值，該值是指定布爾值的最後一個索引。如果找不到該值，則返回-1。

下麵的程序演示了此方法：

示例1：

// Java code to show implementation of 
// Guava's Booleans.lastIndexOf() method 
  
import com.google.common.primitives.Booleans; 
import java.util.Arrays; 
  
class GFG { 
  
    // Driver's code 
    public static void main(String[] args) 
    { 
        // Creating a boolean array 
        boolean[] arr = { true, false, false, 
                          true, true }; 
  
        boolean target = true; 
  
        // Using Booleans.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 = Booleans.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 4

示例2：

// Java code to show implementation of 
// Guava's Booleans.lastIndexOf() method 
  
import com.google.common.primitives.Booleans; 
import java.util.Arrays; 
  
class GFG { 
  
    // Driver's code 
    public static void main(String[] args) 
    { 
        // Creating a boolean array 
        boolean[] arr = { true, true, true, 
                          true, true }; 
  
        boolean target = false; 
  
        // Using Booleans.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 = Booleans.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

參考： https://google.github.io/guava/releases/20.0/api/docs/com/google/common/primitives/Booleans.html#lastIndexOf-boolean:A-boolean-

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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 | Booleans.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。