Java Guava Booleans类

1 什么是Guava Booleans类

Booleans 是原始类型 Boolean 的实用程序类。

2 Guava Booleans类的语法

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

3 Guava Booleans类的方法

5 Guava Booleans类的例子

让我们看一个简单的Guava Booleans类示例。

package com.yiidian;

import com.google.common.primitives.Booleans;

import java.util.List;

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));
   }
}

输出结果为：