Guava – Booleans.contains()方法及示例

Guava – Booleans.contains()方法及示例

Guava库中Booleans类的contains()方法用于检查一个指定的值是否存在于指定的布尔值数组中。要搜索的布尔值和要搜索的布尔数组都作为一个参数。

语法:

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

参数:该方法接受两个强制性参数。

  • array:这是一个布尔值的数组,目标值将在其中被搜索。
  • target:是要在数组中搜索的布尔值。

返回值: 该方法返回一个布尔值,说明目标布尔值是否存在于指定的布尔数组中。如果目标值存在于数组中,它返回True。否则,它返回false。

下面的程序说明了contains()方法的使用。

例子-1 :

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

输出:

Target is present in the array

例子 – 2 :

// Java code to show implementation of
// Guava's Booleans.contains() 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.contains() method to search
        // for an element in the array. The method
        // returns true if element is found, else
        // returns false
        if (Booleans.contains(arr, target))
            System.out.println("Target is present "
                               + "in the array");
        else
            System.out.println("Target is not present "
                               + "in the array");
    }
}

输出:

Target is not present in the array

参考资料:

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

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