Guava Booleans类

Booleans是一个用于原始类型Boolean的实用类。

类声明

以下是 com.google.common.primitives.Booleans 类的声明:

@GwtCompatible(emulated = true)   public final class Booleans      extends Object

方法

继承方法

这个类从以下类继承方法：

Booleans类示例

使用您选择的任何编辑器创建以下Java程序，例如在C:/> Guava目录中：

GuavaTester.java

import java.util.List;import com.google.common.primitives.Booleans;public class GuavaTester {   public static void main(String args[]) {      GuavaTester tester = new GuavaTester();      tester.testBooleans();   }   private void testBooleans() {      boolean[] booleanArray = {true,true,false,true,true,false,false};      //convert array of primitives to array of objects      List<Boolean> objectArray = Booleans.asList(booleanArray);      System.out.println(objectArray.toString());      //convert array of objects to array of primitives      booleanArray = Booleans.toArray(objectArray);      System.out.print("[ ");      for(int i = 0; i< booleanArray.length ; i++) {         System.out.print(booleanArray[i] + " ");      }      System.out.println("]");      //check if element is present in the list of primitives or not      System.out.println("true is in list? " + Booleans.contains(booleanArray, true));      //return the first index of element      System.out.println("true position in list " + Booleans.indexOf(booleanArray, true));      //Returns the count of true values      System.out.println("true occured: " + Booleans.countTrue());      //Returns the comparisons      System.out.println("false Vs true: " + Booleans.compare(false, true));      System.out.println("false Vs false: " + Booleans.compare(false, false));      System.out.println("true Vs false: " + Booleans.compare(true, false));      System.out.println("true Vs true: " + Booleans.compare(true, true));   }}

验证结果

使用 javac 编译器编译类，如下所示−

C:\Guava>javac GuavaTester.java

现在运行GuavaTester来查看结果。

C:\Guava>java GuavaTester

查看结果。

[true, true, false, true, true, false, false][ true true false true true false false ]true is in list? truetrue position in list 0true occured: 0false Vs true: -1false Vs false: 0true Vs false: 1true Vs true: 0