Guava – Booleans.countTrue()方法及示例

Guava – Booleans.countTrue()方法及示例

Guava Library中Booleans类的countTrue()方法是用来计算作为参数传递的指定布尔值中为真的数值的数量。

语法:

public static int countTrue(boolean... values)

参数: 该方法接受布尔值,其中的真值将被计算。

返回值: 该方法返回一个整数值,即为真值的计数。

例子-1 :

// Java code to show implementation of
// Guava's Booleans.countTrue() 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 };
  
        // Using Booleans.countTrue() method to
        // get the number of values that are true
        System.out.println(Booleans.countTrue(arr));
    }
}

输出:

3

例2 :

// Java code to show implementation of
// Guava's Booleans.countTrue() 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, false,
                          false, false };
  
        // Using Booleans.countTrue() method to
        // get the number of values that are true
        System.out.println(Booleans.countTrue(arr));
    }
}

输出:

0

参考资料:

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

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