Guava – Booleans.asList()方法及示例

Guava – Booleans.asList()方法及示例

Guava的Booleans类的Booleans.asList()方法接受一个布尔数组作为参数,并返回一个具有固定大小的列表。返回的列表是由作为参数传递的布尔数组支持的。这意味着作为参数传递的数组的变化将反映在方法返回的列表中,反之亦然。

语法:

public static List< Boolean >asList(boolean… backingArray)

参数: 该方法接受一个强制性参数backingArray,它是一个布尔数组,用于支持列表。

返回值: Booleans.asList()方法返回一个固定大小的列表,该列表由作为参数传递给该方法的数组支持。换句话说,该方法返回数组的列表视图。

下面的例子说明了上述方法的实现。

例1:

// Java code to show implementation of
// Guava's Booleans.asList() method
  
import com.google.common.primitives.Booleans;
import java.util.List;
  
class GFG {
  
    // Driver's code
    public static void main(String[] args)
    {
  
        // Creating a Boolean array
        boolean arr[] = { true, false, true,
                          true, true };
  
        // Using Booleans.asList() method to wrap
        // the specified primitive Boolean array
        // as a List of the Boolean type
        List<Boolean> myList = Booleans.asList(arr);
  
        // Displaying the elements in List
        System.out.println(myList);
    }
}

输出:

[true, false, true, true, true]

例2:

// Java code to show implementation of
// Guava's Booleans.asList() method
  
import com.google.common.primitives.Booleans;
import java.util.List;
  
class GFG {
  
    // Driver's code
    public static void main(String[] args)
    {
  
        // Creating a Boolean array
        boolean arr[] = { false, true, false };
  
        // Using Booleans.asList() method to wrap
        // the specified primitive Boolean array
        // as a List of the Boolean type
        List<Boolean> myList = Booleans.asList(arr);
  
        // Displaying the elements in List
        System.out.println(myList);
    }
}

输出:

[false, true, false]

参考资料:

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

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