Guava – Booleans.concat()方法及示例

Guava – Booleans.concat()方法及示例

Guava库中布尔类的concat()方法是用来将许多数组的值连接成一个单一的数组。这些要串联的布尔数组被指定为该方法的参数。

例如:concat(new boolean[] {a, b}, new boolean[] {}, new boolean[] {c} 返回数组{a, b, c}。

语法:

public static boolean[] concat(boolean[]... arrays)

参数: 该方法接受数组作为参数,该数组是要被该方法连接的布尔数组。

返回值: 该方法返回一个布尔数组,其中包含所有指定的布尔数组值的原始顺序。

下面的程序说明了concat()方法的使用。

例子-1 :

// Java code to show implementation of
// Guava's Booleans.concat() method
  
import com.google.common.primitives.Booleans;
import java.util.Arrays;
  
class GFG {
  
    // Driver's code
    public static void main(String[] args)
    {
  
        // Creating 2 Boolean arrays
        boolean[] arr1 = { true, false, true };
        boolean[] arr2 = { false, false, false, true };
  
        // Using Booleans.concat() method to combine
        // elements from both arrays into a single array
        boolean[] res = Booleans.concat(arr1, arr2);
  
        // Displaying the single combined array
        System.out.println(Arrays.toString(res));
    }
}

输出:

[true, false, true, false, false, false, true]

例2 :

// Java code to show implementation of
// Guava's Booleans.concat() method
  
import com.google.common.primitives.Booleans;
import java.util.Arrays;
  
class GFG {
  
    // Driver's code
    public static void main(String[] args)
    {
        // Creating 4 boolean arrays
        boolean[] arr1 = { true, false, false };
        boolean[] arr2 = { true, true };
        boolean[] arr3 = { false, false, false };
        boolean[] arr4 = { false, true };
  
        // Using Booleans.concat() method to combine
        // elements from both arrays into a single array
        boolean[] res
            = Booleans.concat(arr1, arr2, arr3, arr4);
  
        // Displaying the single combined array
        System.out.println(Arrays.toString(res));
    }
}

输出:

[true, false, false, true, true, false, false, false, false, true]

参考资料:

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

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