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What is the most frequent concurrency issue you've encountered in Java? [closed]
...he object you're synchronizing on while synchronizing on it:
synchronized(foo) {
foo = ...
}
Other concurrent threads are then synchronizing on a different object and this block does not provide the mutual exclusion you expect.
...
Passing an array by reference
...ray of references int & array[100];.
EDIT: Some clarification.
void foo(int * x);
void foo(int x[100]);
void foo(int x[]);
These three are different ways of declaring the same function. They're all treated as taking an int * parameter, you can pass any size array to them.
void foo(int (&am...
PostgreSQL: How to pass parameters from command line?
... statement, use apostrophes around variable name, like this: SELECT * FROM foo WHERE bar = :'v3';
– Cromax
Feb 8 '17 at 7:04
1
...
Spring MVC: How to perform validation?
...egardless of which type of validation you're using:
RequestMapping(value="fooPage", method = RequestMethod.POST)
public String processSubmit(@Valid @ModelAttribute("foo") Foo foo, BindingResult result, ModelMap m) {
if(result.hasErrors()) {
return "fooPage";
}
...
return "su...
Why does C++ not allow inherited friendship?
...swers), but the lack of something along the lines of virtual friend class Foo; puzzles me. Does anyone know the historical background behind this decision? Was friendship really just a limited hack that has since found its way into a few obscure respectable uses?
...
What is the difference between `raise “foo”` and `raise Exception.new(“foo”)`?
...
Technically, the first raises a RuntimeError with the message set to "foo", and the second raises an Exception with the message set to "foo".
Practically, there is a significant difference between when you would want to use the former and when you want to use the latter.
Simply put, you prob...
C#泛型(List)中基类和子类 怎么转换？ - .NET(C#) - 清泛IT论坛，有思想、有深度
List<ChildClass> childList = ...
Foo(List<BaseClass> baseList);
需求：把子类列表传入函数Foo，Foo支持所有子类列表。
方法一：
Foo(childList.Select(p => p as BaseClass).ToList())
上述 Select 转换是双向的，基类转子类也没问题。
方...
How do Mockito matchers work?
... generally used in assertions such as the one below.
/* Mockito */ verify(foo).setPowerLevel(gt(9000));
/* Hamcrest */ assertThat(foo.getPowerLevel(), is(greaterThan(9000)));
Mockito matchers exist, separate from Hamcrest-style matchers, so that descriptions of matching expressions fit directly in...
Why no ICloneable?
... with cloning comes with a variation of the "diamond problem": if CloneableFoo inherits from [not publicly cloneable] Foo, should CloneableDerivedFoo derive from...
– supercat
Aug 10 '12 at 15:26
...
Why should we typedef a struct so often in C?
...position of ordering relationships among header files.
Consider:
#ifndef FOO_H
#define FOO_H 1
#define FOO_DEF (0xDEADBABE)
struct bar; /* forward declaration, defined in bar.h*/
struct foo {
struct bar *bar;
};
#endif
With such a definition, not using typedefs, it is possible for a compil...