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Compare values of return type Boolean and Integer

There's a shorter way to write it:

Instead of:

if (BServer.y.equals(new Integer(1))) {
    return true;
} else {
    return false;

write :

return (BServer.y == 1) ? true : false;

Categories : Java

Related to : Compare values of return type Boolean and Integer
What does return; in a C function of boolean return type return?
This is undefined behavior, a return statement without an expression shall only be used in a function whose return type is void. This is covered in the draft C99 standard section The return statement: [...]A return statement without an expression shall only appear in a function whose return type is void. Interestingly this is an error by default when using clang but gcc without any

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Unable to return NULL in a function that expects an integer return type
If the return type is int, you can't return a NULL. To show an error, you could instead return a special value like zero or -1, if you check for that value in any calling function. Lots of functions return nonnegative numbers on success, or -1 on error. NULL cannot be stored in an int variable, unlike in SQL, for example. If you ignore the warning and return NULL anyway, then NULL will be casted

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Boolean Method does not return false
Always use == when you need to compare , which means equality in Java, while = means assignment. This is different from some language like PL/SQL. So when you call while(choice =false), Java only assigns false to variable choice , it does not compare the choice with false. You should use while(choice==false) instead, the same in if (choice == true) Check operators for more details

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Left outer join - how to return a boolean for existence in the second table?
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Compare one element from one table in another one and return column
Here's one way to go about it: d <- read.table(text=' V1 V2 V3 V4 V5 V6 V7 1 1 a 2.0 3.0 4.0 9.0 6.0 2 1 b 0.2 0.1 0.8 0.9 0.2 3 1 c 0.1 0.3 0.4 0.1 0.8 4 1 d 0.1 0.1 0.3 0.1 0.4 5 2 a 1.0 2.0 3.0 4.0 5.0 6 2 b 0.1 0.4 0.3 0.5 0.7 7 2 c 0.1 0.4 0.2 0.5 0.8 8 2 d 0.2 0.5 0.6 0.7 0.9 9 3 a 8.0 2.0 3.0 4.0 5.0 10 3 b 0.1 0.4 0.3 0.5 0.7 11 3 c 0.1 0.4 0.2 0.5

Categories : R
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