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发表于 2019-08-26 15:24:39 | 查看: 5060| 回复: 0

Guava Booleans类

Guava Booleans类

Booleans是布尔型基本的实用工具类。

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

Guava Booleans类_www.wityx.com

方法继承

这个类继承了以下类方法:

java.lang.Object

Booleans 示例

使用所选择的任何编辑器创建下面的java程序 C:/> Guava 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编译器编译如下类

C:Guava>javac GuavaTester.java

现在运行GuavaTester看到的结果

C:Guava>java GuavaTester

看到结果

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


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