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Why do I need to override the equals and hashCode methods in Java?
...lse;
return true;
}
}
Imagine you have this
MyClass first = new MyClass("a","first");
MyClass second = new MyClass("a","second");
Override only equals
If only equals is overriden, then when you call myMap.put(first,someValue) first will hash to some bucket and when you call myMap.put...
ROW_NUMBER() in MySQL
...solution is basically the same as if someone would try to find the largest id with the following query: SELECT t1.id FROM test t1 LEFT JOIN test t2 ON t1.id>t2.id WHERE t2.id IS NULL; Does not it require n*n/2 + n/2 IS NULL comparisons to find the single row? Do there happen any optimizations I d...
How to create a custom-shaped bitmap marker with Android map API v2 [duplicate]
...ge is set to a GoogleMap.
// Uses a custom icon.
mSydney = mMap.addMarker(new MarkerOptions()
.position(SYDNEY)
.title("Sydney")
.snippet("Population: 4,627,300")
.icon(BitmapDescriptorFactory.fromResource(R.drawable.arrow)));
As this just replaces the marker with an image you mig...
JavaScript private methods
...call(this, '>>');
}
return MyObject;
})();
var myObject = new MyObject('bar');
myObject.publicFun(); // Returns '>>bar'
myObject.privateFun('>>'); // ReferenceError: private is not defined
The call function allows us to call the private function with the appropria...
T-SQL query to show table definition?
...sword, string database, string schema, string table)
{
new Server(new ServerConnection(server, user, password))
.Databases[database]
.Tables[table, schema]
.Script(new ScriptingOptions { SchemaQualify = true,
...
Difference between compile and runtime configurations in Gradle
...unction () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f16700939%2fdifference-between-compile-and-runtime-configurations-in-gradle%23new-answer', 'question_page');
}
);
...
How to parameterize @Scheduled(fixedDelay) with Spring 3.0 expression language?
...unction () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f2598712%2fhow-to-parameterize-scheduledfixeddelay-with-spring-3-0-expression-language%23new-answer', 'question_page');
}
);...
How to parse JSON in Python?
...n
data = json.loads(json_string)
if data["fa"] == "cc.ee":
data["fb"]["new_key"] = "cc.ee was present!"
print json.dumps(data)
The output for the above code will be:
{"pk": 1, "fb": {"new_key": "cc.ee was present!", "fd_id": "12345",
"fc": ""}, "fa": "cc.ee"}
Note that you can set the id...
HTML5 Email Validation
... // Set the regular expression to validate the email
validation = new RegExp(validations['email'][0]);
// validate the email value against the regular expression
if (!validation.test(this.value)){
// If the validation fails then we show the custom error message
...
Jackson and generic type reference
...List.class, Foo.class)
and then
List<Foo> list = mapper.readValue(new File("input.json"), type);
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