1、使用Arrays的sort()方法排序 2、使用Arrays的binarySearch(Object[] a, Object key)方法查找元素 3、使用Arrays的copyOfRange(int[] original, int from, int to)方法拷贝元素 将数组中指定范围的元素复制到一个新的数组中,该方法中参数original表示被复制的数组
int[] arr = {1,3,4,5,6};intindex=Arrays.binarySearch(arr,4);//index的值为2intindex=Arrays.binarySearch(arr,2);//index2的值为-1 大数据运算 java中long型为最大整数类型,对于超过long型的数据如何去表示呢.在Java的世界中,超过long型的整数已经不能被称为整数了, 它们被封装成BigInteger对象.在B...
& g Arrays类有一个静态方法sort,利用这个方法我们可以传入我们要排序的数组进去排序,因为我们传入的是一个数组的引用,所以排序完成的结果也 通过这个引用的来更改数组.对于整数、字符串排序,jdk提供了默认的实现,如果要对一个对象数组排序,则要自己实现 java.util.Comparator接口。
test; import java.util.Arrays; import java.util.Iterator; import java.util.List; /** * @Author bennyrhys * @Date 9/1/21 11:48 PM * Iterable随机数生成器 */ public class RandomString<T> implements Iterable{ private final List<T> list; public RandomString(List<T> list) { this.list ...
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1.在官网下载对应的安装包https://www.scala-lang.org/download/ 2.安装 选项位置保持默认即可,path环境建议手动添加,在安装中吧path勾掉 3.配置环境变量...;java.lang.NullPointerException atjava.util.Arrays.sort(Arrays.java:1438) at 快学Big Data -- Scala总结(二十二) ...
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public static void main(String[] args) { int[] inits = new int[10] ; //将数组全部赋值为2 Arrays.fill(inits , 2) ; show(inits) ; //将数组的第4 、6 、赋值为1, Arrays.fill(inits,4 , 6 , 1) ; show(inits) ; //升序 inits = new int[]{1,2,3,9,6,5,4,8,45,321...