Guava教程

Guava Floats类

 

Floats是float基本类型的实用工具类。

 

类声明

 

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

 

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

 

字体

 


方法

 

 

继承的方法

 

这个类继承了以下类方法:

 java.lang.Object

 

Floats 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.Floats;

public class GuavaTester {

   public static void main(String args[]){
      GuavaTester tester = new GuavaTester();
      tester.testFloats();
   }

   private void testFloats(){
      float[] floatArray = {1.0f,2.0f,3.0f,4.0f,5.0f,6.0f,7.0f,8.0f,9.0f};

      //convert array of primitives to array of objects
      List<Float> objectArray = Floats.asList(floatArray);
      System.out.println(objectArray.toString());

      //convert array of objects to array of primitives
      floatArray = Floats.toArray(objectArray);
      System.out.print("[ ");
      for(int i = 0; i< floatArray.length ; i++){
         System.out.print(floatArray[i] + " ");
      }
      System.out.println("]");
      //check if element is present in the list of primitives or not
      System.out.println("5.0 is in list? "+ Floats.contains(floatArray, 5.0f));

      //return the index of element
      System.out.println("5.0 position in list "+ Floats.indexOf(floatArray, 5.0f));

      //Returns the minimum		
      System.out.println("Min: " + Floats.min(floatArray));

      //Returns the maximum		
      System.out.println("Max: " + Floats.max(floatArray));	
   }
}

 

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

 

[1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0]
[ 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 ]
5.0 is in list? true
5.0 position in list 4
Min: 1.0
Max: 9.0

 

 

 

 

转载自并发编程网-ifeve.com

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