{stringa ="abcdefg";stringexpected ="gfedcba"; Console.WriteLine(string.Equals(expected, StringReverse.ReverseByArray(a))); Console.WriteLine(string.Equals(expected, StringReverse.ReverseByStringBuilder(a))); Console.WriteLine(string.Equals(expected, StringReverse.ReverseByStringBuilder2(a))); Console....
集合【Map、可变参数、Collections】 第1章 Map接口 1.1 Map接口概述 我们通过查看Map接口描述,发现Map接口下的集合与Collection接口下的集合,它们存储数据的形式不同,如下图。 l Collection中的集合,元素是孤立存在的(理解为单身),向集合中存储元素采用一个个元素的方式存储。 l Ma... ...
1. Java Program to Reverse the Characters of a String We canreverse a string by charactereasily, using aStringBuilder.reverse()method. StringblogName="HowToDoInJava.com";Stringreverse=newStringBuilder(string).reverse();System.out.println("Original String -> "+blogName);System.out.println("Rever...
// Java program to illustratereverse() method// of Collections class over ArrayList// Importing utility classesimportjava.util.*;// Main classpublicclassGFG{// main driver methodpublicstaticvoidmain(String[] args){// Let us create a list of stringsList<String> mylist =newArrayList<String>();...
// Java program is to demonstrate the example of//reverse(List l) method of Collectionsimportjava.util.*;publicclassReverseOfCollections{publicstaticvoidmain(String args[]){// Instatiates a array list objectList < Integer > arr_l =newArrayList < Integer > ();// By using add() method is...
// Java program to Illustrate Reversal of Array // using reverse() method of Collections class // Importing utility classes import java.util.*; // Main class public class GFG { // Main driver method public static void main(String[] args) { // Creating input integer array Integer arr[]...
packagecom.company;importjava.util.ArrayList;importjava.util.Collections;importjava.util.List;/*分别举例Collections中的方法 1.ddAll 向集合里面添加多个元素 * 2.binarySearch查找出值的索引 * 3.copy 集合之间的复制 * 4.sort 自然排序(升序) * 5.fill 指定元素替换列表中的所有元素 ...
rollno; } } // Class 3 // Main class class GFG { // Main driver method public static void main(String[] args) { // Creating an empty ArrayList ArrayList<Student> ar = new ArrayList<Student>(); // Adding custom attributes defined in Student class // using add() method ar.add(new...
Java基础之集合框架--Collections.reverse()方法 packagenewFeatures8;importjava.util.ArrayList;importjava.util.Collections;importjava.util.List;publicclassCollectionsDemo{publicstaticvoidmain(String[] args){ reverseDemo(); }publicstaticvoidreverseDemo(){...
*/publicstaticvoidswap(intaIndex,intbIndex,int[]arr){inttemp=arr[aIndex];arr[aIndex]=arr[bIndex];arr[bIndex]=temp;}} 第二段 importjava.util.Arrays;publicclassSwapArrayMethod2Test{publicstaticvoidmain(String[]args){int[]arr={1,2,3,4,5,6,7,8,9,10};int[]arrResult=newint[arr.len...