ArrayListis an ordered collection and it allows duplicate elements. It is widely used to store and retrieve data. We have seen a few methods of the ArrayList class before likeadd(),addAll(),remove(),set(),iterate()andclear(). Today we will see thecontains()method. ...
例如,对于ArrayList,contains方法会遍历整个列表以查找指定元素。而对于HashSet,由于使用了哈希表,可以通过哈希值快速定位元素。 2.2 示例代码 以下是一个使用ArrayList和HashSet的例子,展示了两者中contains方法的使用: importjava.util.ArrayList;importjava.util.HashSet;publicclassCollectionContainsExample{publicstaticvoid...
util.ArrayList; public class Main { public static void main(String[] args) { ArrayList<String> cars = new ArrayList<String>(); cars.add("Volvo"); cars.add("BMW"); cars.add("Ford"); cars.add("Mazda"); System.out.println(cars.contains("BMW")); System.out.println(cars.contains("...
ArrayList.Contains Method發行項 2011/09/08 本文內容 Syntax Version Information See Also Determines whether a specified object is contained in the ArrayList collection.Namespace: System.Collections Assembly: mscorlib (in mscorlib.dll)SyntaxC# 複製 public virtual bool Contains ( Object item ) ...
问如何使用ArrayLists、subList()和contains()方法独占地查找和打印重复值EN只需实现逻辑。
public class D85_1_ContainsMethod { public static void main(String[] args) { //创建集合 Collection c = new ArrayList(); //创建两个Integer类型的对象 Integer i1 = new Integer(10); //添加元素 c.add(i1); //判断集合中是否包含11 ...
public class ContainsMethod { public ContainsMethod() { } public static void main(String[] args) { ArrayList<String> codePool = new ArrayList(); codePool.add("1"); codePool.add("2"); int intCode = 1; Integer integerCode = Integer.valueOf(2); ...
使用List.contains(Object object)方法判断ArrayList是否包含一个元素对象(针对于对象的属http://性值相同,但对象地址不同的情况),如果没有重写List的元素对象Object中的equals方法,默认如下: @Override public boolean equals(Object o) { // TODO Auto-generated method stub ...
@Overridepublicbooleanequals(Objecto) {// TODO Auto-generated method stubreturnsuper.equals(o); } AI代码助手复制代码 将导致contains方法始终返回false。 查看ArrayList的contains方法的源码如下: /** * Searches this {@codeArrayList} for the specified object. ...
The syntax of the Stringcontains()method is: string.contains(CharSequence ch) Here,stringis anobjectof theStringclass. contains() Parameters Thecontains()method takes a single parameter. ch(charSequence) - a sequence of characters Note:AcharSequenceis a sequence of characters such as:String,Char...