lambdaj

lambdaj fails java.lang.ExceptionInInitializerError with any call on Android

由 送分小仙女□ 提交于 2020-01-10 05:37:06
问题 I'm trying to use lambdaj on Android but with every simple call I make I get an exception (java.lang.ExceptionInInitializerError). The class that fills the collection is: @DatabaseTable(tableName = "sections") public class Section { @DatabaseField(id = true, unique = true) private int id; @DatabaseField(canBeNull = false) private String name; public Section() { } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void

Select object from ARRAYLIST WITHOUT LOOP - ANDROID

由 ぐ巨炮叔叔 提交于 2019-12-31 04:12:28
问题 I am looking for a library which can select object from ArrayList like SQL "where" command. I have huge arraylists (between 2000 and 20000) in my project and i don't want to write for,while loops every time.. I found lambdaj and it is for Java. I tried to use lambdaj inside my Android project but i couldn't do it. For example when i write List<Sale> sortedSales = sort(sales, on(Sale.class).getCost()); this example code in my project, eclipse couldn't see "sort", "on" commands.. Is there

Compare sets inside a set

由 我与影子孤独终老i 提交于 2019-12-22 01:32:52
问题 I have a set like this : Set<Set<Node>> NestedSet = new HashSet<Set<Node>>(); [[Node[0], Node[1], Node[2]], [Node[0], Node[2], Node[6]], [Node[3], Node[4], Node[5]]] I want to compare and merge sets that are inside the nested set. [0,1,2] and [0,2,6] has element in common. so should merge them to form 0,1,2,6. The output should be like this: [[Node[0], Node[1], Node[2], Node[6]], [Node[3], Node[4], Node[5]]] Is there any efficient way? 回答1: You can use Collections.disjoint(Collection c1,

Case Insensitive filtering with lambdaj

由 ﹥＞﹥吖頭↗ 提交于 2019-12-12 03:03:25
问题 I'm attempting to familiarize myself with lambdaj, and am unsure how the best way to solve this problem. Given the following test: @Test public void test() { final List<String> l1 = new ArrayList<>(); final List<String> l2 = new ArrayList<>(); l1.add("same"); l1.add("Upper"); l1.add("lower"); l2.add("same"); l2.add("upper"); l2.add("lower"); l2.add("extra"); final List<String> l3 = Lambda.filter(Matchers.not(Matchers.isIn(l1)), l2); Assert.assertThat("There should be one item in l3", l3.size(

Gross Lack of efficacy in using LambdaJ over iteration

由 耗尽温柔 提交于 2019-12-12 02:59:30
问题 In a java ee application with JSF and JPA,I have to calculate totals of attributes in lists of objects. I have used LambdaJ library to achieve the calculation of sums. As I use this sort of summations in several places of the application with possible implications to the overall performance, I designed the following test java application to test the efficacy of LambdaJ. This application demonstrated a gross lack of efficacy of LambdaJ. Is there any error in the testing programme or should I

Lambdaj NoClassDefFoundError on android

由 孤街醉人 提交于 2019-12-11 14:07:46
问题 I'm trying out lambdaj in my android app but even the simplest filtering operations fail with the exception listed. For example: Group<Person> groupedPersons= group(people,by(on(Person.class).getAge())); and any other select or filter ends up with the same following exception, any idea? The "Person" class is a greenDAO class if it could be related..... thanks 04-05 16:07:48.735: E/AndroidRuntime(6579): FATAL EXCEPTION: main 04-05 16:07:48.735: E/AndroidRuntime(6579): java.lang

Lambda expressions of .NET in Java

由 徘徊边缘 提交于 2019-12-08 15:50:38
问题 I recently moved from C# to Java [again]. But I badly miss lambda expressions and things like IEnumerable.Foreach of C#. So I am looking for a lambda expression library in Java. are there better libraries than LambdaJ? Also is clojure directly inlinable in Java programs? That is can I mix clojure code in Java functions? 回答1: Java 8 might have lambda support natively. Until then you can use a combination of anonymous inner classes and libraries like google-guava. Below are other libraries that

Using lambdaj in android

由 坚强是说给别人听的谎言 提交于 2019-12-05 14:49:26
问题 Does anyone tried to use lambdaj library in android development? It works fine for me when I create a simple small java application, but I can't manage to use it in an android application. UPDATE: I'm adding lambdaj (lambdaj-2.3.2-with-dependencies.jar, downloaded from http://code.google.com/p/lambdaj), and then when building my application get the following error: Dx warning: Ignoring InnerClasses attribute for an anonymous inner class (org.hamcrest.generator.qdox.directorywalker

Select object from ARRAYLIST WITHOUT LOOP - ANDROID

由 筅森魡賤 提交于 2019-12-02 05:21:56
I am looking for a library which can select object from ArrayList like SQL "where" command. I have huge arraylists (between 2000 and 20000) in my project and i don't want to write for,while loops every time.. I found lambdaj and it is for Java. I tried to use lambdaj inside my Android project but i couldn't do it. For example when i write List<Sale> sortedSales = sort(sales, on(Sale.class).getCost()); this example code in my project, eclipse couldn't see "sort", "on" commands.. Is there another library like lambdaj or can anyone tell me how can i use lambdaj in my android project ? Thanks..

lambdaj fails java.lang.ExceptionInInitializerError with any call on Android

由 有些话、适合烂在心里 提交于 2019-11-29 15:33:20
I'm trying to use lambdaj on Android but with every simple call I make I get an exception (java.lang.ExceptionInInitializerError). The class that fills the collection is: @DatabaseTable(tableName = "sections") public class Section { @DatabaseField(id = true, unique = true) private int id; @DatabaseField(canBeNull = false) private String name; public Section() { } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } } The annotations are used by ORMLite. I left them in case
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