Guava Ints類

整數Ints是原始的int類型的實用工具類。

類聲明

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

@GwtCompatible
public final class Ints
? ?extends Object

字段

方法

繼承的方法

這個類繼承了以下類方法：java.lang.Object

Ints 示例

使用所選擇的任何編輯器創建下面的java程序 C:/> Guava

GuavaTester.java

import java.util.List;

import com.google.common.primitives.Ints;

public class GuavaTester {

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

   private void testInts(){
      int[] intArray = {1,2,3,4,5,6,7,8,9};

      //convert array of primitives to array of objects
      List<Integer> objectArray = Ints.asList(intArray);
      System.out.println(objectArray.toString());

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

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

      //Returns the maximum		
      System.out.println("Max: " + Ints.max(intArray));

      //get the byte array from an integer
      byte[] byteArray = Ints.toByteArray(20000);
      for(int i = 0; i< byteArray.length ; i++){
         System.out.print(byteArray[i] + " ");
      }
   }
}

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, 6, 7, 8, 9]
[ 1 2 3 4 5 6 7 8 9 ]
5 is in list? true
Min: 1
Max: 9
0 0 78 32?

 

 

 

 

轉載自并發編程網-ifeve.com