Java Booleans类

Booleans 是原始类型Boolean的一个实用类。它提供了与布尔基元有关的 静态实用方法 ，这些方法 在布尔或数组中都没有找到。

声明 :

@GwtCompatible(emulated=true)public final class Booleansextends Object

以下是Guava Booleans类提供的一些方法：

异常情况

下表显示了Guava Booleans类提供的一些其他方法：

下面给出了一些例子，显示了Guava Booleans类方法的实现。

例子1 :

// Java code to show implementation// of Guava Booleans.asList() method import com.google.common.primitives.Booleans;import java.util.*; class GFG {    // Driver method    public static void main(String[] args)    {        boolean arr[] = { true, false, true, false, true };         // Using Booleans.asList() method which        // converts array of primitives to array of objects        List<Boolean> myList = Booleans.asList(arr);         // Displaying the elements        System.out.println(myList);    }}

输出:

[true, false, true, false, true]

例2 :

// Java code to show implementation// of Guava Booleans.toArray() method import com.google.common.primitives.Booleans;import java.util.*; class GFG {    // Driver method    public static void main(String[] args)    {        List<Boolean> myList = Arrays.asList(true, false, true, false, true);         // Using Booleans.toArray() method which        // converts a List of Booleans to an        // array of boolean        boolean[] arr = Booleans.toArray(myList);         // Displaying the elements        System.out.println(Arrays.toString(arr));    }}

输出:

[true, false, true, false, true]

例3 :

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

输出:

[true, false, true, false, true]

例4 :

// Java code to show implementation// of Guava Booleans.contains() method import com.google.common.primitives.Booleans; class GFG {    // Driver method    public static void main(String[] args)    {        boolean[] arr = { true, false, true, false, true };         // Using Booleans.contains() method which        // checks if element is present in array        // or not        System.out.println(Booleans.contains(arr, true));        System.out.println(Booleans.contains(arr, false));    }}

产出 :

truetrue

例5 :

// Java code to show implementation// of Guava Booleans.compare() method import com.google.common.primitives.Booleans; class GFG {    // Driver method    public static void main(String[] args)    {        // To compare true vs true        System.out.println(Booleans.compare(true, true));    }}

输出:

0

例6 :

// Java code to show implementation// of Guava Booleans.indexOf() method import com.google.common.primitives.Booleans; class GFG {    // Driver method    public static void main(String[] args)    {        boolean[] arr = { true, false, true, false, true };         // To print index of first occurrence of false        System.out.println(Booleans.indexOf(arr, false));    }}

输出:

1