Guava Bytes類

Bytes是byte的基本類型實用工具類。

類聲明

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

@GwtCompatible
public final class Bytes
? ?extends Object

方法

繼承的方法

這個類繼承了以下類方法： java.lang.Object

Bytes 示例

使用所選擇的編輯器創建下面的java程序 C:/> Guava

GuavaTester.java

import java.util.List;
import com.google.common.primitives.Bytes;

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

   private void testBytes(){
      byte[] byteArray = {1,2,3,4,5,5,7,9,9};

      //convert array of primitives to array of objects
      List<Byte> objectArray = Bytes.asList(byteArray);
      System.out.println(objectArray.toString());

      //convert array of objects to array of primitives
      byteArray = Bytes.toArray(objectArray);
      System.out.print("[ ");
      for(int i = 0; i< byteArray.length ; i++){
         System.out.print(byteArray[i] + " ");
      }
      System.out.println("]");
      byte data = 5;
      //check if element is present in the list of primitives or not
      System.out.println("5 is in list? "+ Bytes.contains(byteArray, data));

      //Returns the index		
      System.out.println("Index of 5: " + Bytes.indexOf(byteArray,data));

      //Returns the last index maximum		
      System.out.println("Last index of 5: " + Bytes.lastIndexOf(byteArray,data));				
   }
}

驗證結果

使用javac編譯器編譯如下類

C:\Guava>javac GuavaTester.java

現在運行GuavaTester看到的結果

C:\Guava>java GuavaTester

看到結果

[1, 2, 3, 4, 5, 5, 7, 9, 9]
[ 1 2 3 4 5 5 7 9 9 ]
5 is in list? true
Index of 5: 4
Last index of 5: 5

 

 

 

 

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