unchecked

CheckBox gets unchecked on scroll in a custom listview

由 蓝咒 提交于 2019-11-27 02:15:15
I know that this question has been asked over and over again but still I've not been a able to find a suggestion that really helps me. The checkbox is unchecked whenever the list is scrolled down. Yes I'm using a boolean array to store the values but this still doesn't fix the problem. Here is my code. Please suggest a solution for this. Thank you. public View getView(final int position, View convertView, ViewGroup parent) { // TODO Auto-generated method stub final ViewHolder holder; final boolean[] itemChecked=new boolean[30]; LayoutInflater inflater = context.getLayoutInflater(); if

How to avoid unchecked cast warnings with Java Generics

由 Deadly 提交于 2019-11-26 21:46:42
问题 Somehow my old question was closed, so I open a new one: I am using Java Generics to implement a generic bidirectional Hash Map out of an SQL Query. It should be able to map any combination of String, Integer pairs back and forth. It should be used like this: String sql = "SELECT string_val, int_val FROM map_table"; PickMap<String, Integer> pm1 = new PickMap<String, Integer>(sql); String key1 = "seven"; Integer value1 = pm1.getLeft2Right(key1); Integer key2 = 7; String value2 = pm1

Java unchecked/checked exception clarification

由 谁说我不能喝 提交于 2019-11-26 20:21:35
问题 I've been reading about unchecked versus checked questions, none of the online resources have been truly clear about the difference and when to use both. From what I understand, both of them get thrown at runtime, both of them represent program states that are outside the expected bounds of the logic, but checked exceptions must be explicitly caught while unchecked ones do not. My question is, suppose for argument's sake I have a method that divides two numbers double divide(double numerator,

if checkbox is checked, do this

由 假如想象 提交于 2019-11-26 18:49:48
问题 When I check a checkbox, I want it to turn <p> #0099ff . When I uncheck the checkbox, I want it to undo that. Code I have so far: $('#checkbox').click(function(){ if ($('#checkbox').attr('checked')) { /* NOT SURE WHAT TO DO HERE */ } }) 回答1: I would use .change() and this.checked : $('#checkbox').change(function(){ var c = this.checked ? '#f00' : '#09f'; $('p').css('color', c); }); -- On using this.checked Andy E has done a great write-up on how we tend to overuse jQuery: Utilizing the

When is @uncheckedVariance needed in Scala, and why is it used in GenericTraversableTemplate?

由 被刻印的时光 ゝ 提交于 2019-11-26 15:40:36
问题 @uncheckedVariance can be used to bridge the gap between Scala's declaration site variance annotations and Java's invariant generics. scala> import java.util.Comparator import java.util.Comparator scala> trait Foo[T] extends Comparator[T] defined trait Foo scala> trait Foo[-T] extends Comparator[T] <console>:5: error: contravariant type T occurs in invariant position in type [-T]java.lang.Object with java.util.Comparator[T] of trait Foo trait Foo[-T] extends Comparator[T] ^ scala> import

What is unchecked cast and how do I check it?

由 假装没事ソ 提交于 2019-11-26 15:37:52
问题 I think I get what unchecked cast means (casting from one to another of a different type), but what does it mean to "Check" the cast? How can I check the cast so that I can avoid this warning in Eclipse? 回答1: Unchecked cast means that you are (implicitly or explicitly) casting from a generic type to a nonqualified type or the other way around. E.g. this line Set<String> set = new HashSet(); will produce such a warning. Usually there is a good reason for such warnings, so you should try to

Type safety: Unchecked cast

由 那年仲夏 提交于 2019-11-26 10:08:26
In my spring application context file, I have something like: <util:map id="someMap" map-class="java.util.HashMap" key-type="java.lang.String" value-type="java.lang.String"> <entry key="some_key" value="some value" /> <entry key="some_key_2" value="some value" /> </util:map> In java class, the implementation looks like: private Map<String, String> someMap = new HashMap<String, String>(); someMap = (HashMap<String, String>)getApplicationContext().getBean("someMap"); In Eclipse, I see a warning that says: Type safety: Unchecked cast from Object to HashMap What did I do wrong? How do I resolve

CheckBox gets unchecked on scroll in a custom listview

由 泄露秘密 提交于 2019-11-26 09:58:54
问题 I know that this question has been asked over and over again but still I\'ve not been a able to find a suggestion that really helps me. The checkbox is unchecked whenever the list is scrolled down. Yes I\'m using a boolean array to store the values but this still doesn\'t fix the problem. Here is my code. Please suggest a solution for this. Thank you. public View getView(final int position, View convertView, ViewGroup parent) { // TODO Auto-generated method stub final ViewHolder holder; final

Why does javac complain about generics unrelated to the class&#39; type arguments? [duplicate]

由 冷暖自知 提交于 2019-11-26 02:02:45
问题 This question already has answers here : Java generic methods in generics classes (6 answers) What is a raw type and why shouldn't we use it? (15 answers) Closed 4 years ago . Please read the comments in the code in order, the question details are there. Why is this difference happening? Please quote the JLS if possible. import java.util.*; /** * Suppose I have a generic class * @param <T> with a type argument. */ class Generic<T> { // Apart from using T normally, T paramMethod() { return

Type safety: Unchecked cast

由 蹲街弑〆低调 提交于 2019-11-26 01:56:35
问题 In my spring application context file, I have something like: <util:map id=\"someMap\" map-class=\"java.util.HashMap\" key-type=\"java.lang.String\" value-type=\"java.lang.String\"> <entry key=\"some_key\" value=\"some value\" /> <entry key=\"some_key_2\" value=\"some value\" /> </util:map> In java class, the implementation looks like: private Map<String, String> someMap = new HashMap<String, String>(); someMap = (HashMap<String, String>)getApplicationContext().getBean(\"someMap\"); In
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