《effective java》第二版第43条是:Return empty arrays or collections, not nulls 意思是在需要返回数组或者集合的方法中,如果需要返回空数据,不要返回null,而是要返回大小为0的数组或者集合。 可能很多情况下,会出现这样的代码: 1privatefinalList<Cheese> cheesesInStock = ...; 2/** 3*@returnan array co...
There is no reason ever to return null from an array or collection-valued method instead of returning an empty array or collection.
博客分类: Effective Java2读书笔记 1. It is errorprone to returnnullin place of an empty (zero-length) array or collection. Because the programmer writing the client might forget to write the special case code to handle anullreturn. 2. It is possible to return the same zero-length array ...
若array[mid] = num结束查找 若array[mid] > num说明array{mid, mid+1... ...end} > num,则此时应该在array{beg... ...mid-1}中查找,end = mid - 1; 若array[mid] < num说明array{beg, beg+1... ...mid} < num, 则此时应该在array{mid+1... ...end}中查找,beg = mid + 1; C...
Process ID: all / any Describe the issue: The processes all and any return null for empty arrays in openEO I think the thought was to express that an empty array means no-data, e.g. all([]) -> null, but also all([null], ignore_nodata = f...
import java.util.Scanner; class FirstElementOfArray { public static void main(String arg[]) { Scanner sc=new Scanner(System.in); System.out.println("Enter the number of elements in an Array"); int n=sc.nextInt(); if(n==0) { System.out.println("Array is Empty"); return; } int...
Queries with no results return a null array This library allows you to query viaStatementBuilder. When you run a query that returns no results, theXYPage#getResults()returnsnull. On my side, this has only been confirmed to be true withInventoryServiceInterface#getAdUnitsByStatement(), however...
如果Optional中的代码有任何异常,我如何使用Optional返回empty? 、 对Optional/Java8的用法非常陌生,我对它的用法持怀疑态度。我的API中有一个函数,它返回一个字符串,该字符串可以为null或为空。它类似于在电子邮件中查找id,例如: abc@gmail.com -> abc is o/p。)) { } String userIDSeparator = "@&quo...
public boolean isEmpty() { return content.length == 0; } @Override public long getSize() { return content.length; } @Override public byte[] getBytes() throws IOException { return content; } @Override public InputStream getInputStream() throws IOException { ...
IsEmptyDynamicValue Курсив Элемент ItemAddedAssociation Itemid ItemListView ItemUpdatedAssociation JARFile JavaSource Join JoinNode JournalMessage JSAPI JSBlankApplication JSCoffeeScript JSConsole JSCordovaMultiDevice JSFixedLayoutApplication JSGridApplication JSHubApplication JSInteractive...