Java 中的 Ints 类


Ints 类是基本类型 int 的实用程序类。让我们看看类声明 −

@GwtCompatible
public final class Ints
extends Object

示例

让我们看一个执行连接的某些方法的示例。Ints 类中的 concat() 函数用于连接作为参数传递的数组 −

import com.google.common.primitives.Ints;
import java.util.*;
class Demo {
   public static void main(String[] args) {
      int[] myArr1 = { 100, 150, 230, 300, 400 };
      int[] myArr2 = { 450, 550, 700, 800, 1000 };
      System.out.println("Array 1 = ");
      for(int i=0; i < myArr1.length; i++) {
         System.out.println(myArr1[i]);
      }
      System.out.println("Array 2 = ");
      for(int i=0; i < myArr2.length; i++) {
         System.out.println(myArr2[i]);
      }
      int[] arr = Ints.concat(myArr1, myArr2);
      System.out.println("Concatenated arrays = "+Arrays.toString(arr));
   }
}

输出

Array 1 =
100
150
230
300
400
Array 2 =
450
550
700
800
1000
Concatenated arrays = [100, 150, 230, 300, 400, 450, 550, 700, 800, 1000]

示例

让我们看另一个示例 −

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] + " ");
      }
   }
}

输出

[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

更新时间: 2019-09-24

282 次浏览

开启您的 职业生涯

通过完成课程获得认证

入门
广告