ArrayList的 indexOf() 方法返回此列表中指定元素第一次出现的索引,如果此列表出现,则返回 -1不包含该元素。 语法: publicintIndexOf(Objecto) obj:Theelement to searchfor. // Java code to demonstrate the working of // indexOf in ArrayList // for ArrayList functions importjava.util.ArrayList; public...
arr.add(4);// using IndexOf() to find first index of 6intpos1 =arr.indexOf(6);// using lastIndexOf() to find last index of 6intpos2 =arr.lastIndexOf(6);// to balance 0 based indexingpos1 = pos1+1; pos2 = pos2+1;// printing first index of 6System.out.println("The f...
lastIndexOf(6); // to balance 0 based indexing pos1 = pos1+1; pos2 = pos2+1; // printing first index of 6 System.out.println("The first occurrence of 6 is : " + pos1); // printing last index of 6 System.out.println("The last occurrence of 6 is : " + pos2); } } ...
每次我运行这个程序时，我都会收到一个错误的信息首先创建测试表，建表及数据写入语句如下： use muke;...
And the indexing of the list begins with 0, not 1. You were also printing inside the loop, had to move outside. I also added the code for taking optional input with default value, using the hasNext method of Scanner. https://code.sololearn.com/ciZM1bUI8JaC/?ref=app 10th Nov 2023,...
theLinkedListcan add or remove an element at any position in constant time --O(1).However, indexing an element is a bit slower --O(i)whereiis the index of the element. Traversing anArrayListis also easier since you can simply use an index instead of having to create an iterator. TheLi...
java—我正在尝试创建一个类似于类arraylist中的lastindexof()的方法，但在查找元素的最后一个索引时遇到...
Cannot apply indexing with [] to an expression of type 'System.Data.Entity.DynamicProxies. Cannot attach the file 'D\...\mydatabasename.mdf' as database 'mydatabasename.mdf' Cannot attach the file *.mdf as database Cannot change the textarea width? Cannot connect to the database Ex...
Cannot apply indexing with [] to an expression of type 'method group' Cannot apply indexing with [] to an expression of type 'System.Collections.Generic.IEnumerable Cannot await 'Void' Cannot cast DBNull.Value to System.Decimal error in LINQ Cannot change startup object of a basic C# console...
ArrayList in Java is a resizable array with direct indexing, ideal for accessing elements. LinkedList, a doubly-linked list, excels in adding/removing elements, trading off slower random access. Difference Between ArrayList in Java and LinkedList in Java ...