Guava Booleans類

Booleans是布爾型基本的實用工具類。

類聲明

以下是com.google.common.primitives.Booleans類的聲明：

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

方法

方法繼承

這個類繼承了以下類方法：

• java.lang.Object

Booleans 示例

使用所選擇的任何編輯器創(chuàng)建下面的java程序 C:/> Guava

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上一篇：Guava Table接口下一篇：Guava BigIntegerMath類