It's part of the JVM instruction set, basically - there's a specific instanceof instruction. So for example, a method like this: public static void checkString(Object x) { if (x instanceof String) { System.out.println("Foo"); ... more 10/5/2013 3:01:10 PM

You're not using the parameters within your lambda expressions in the joins - you've used datas1[0] and datas2[0] instead of d1[0] and d2[0]. Additionally, your projection to the result doesn't give you want you've said you want. Your... more 10/5/2013 12:33:51 PM

Your SQL doesn't have any parameters: Select u.username,u.password,b.branchname from user u, branch b, userbranch ubwhere u.userid = ub.userid and b.branchid=ub.branchid So it's failing when you try to set parameters. You probably... more 10/5/2013 11:28:22 AM

I think line-3 and line-4 do same task, then why compiler showing error on line-4 "Type mismatch: cannot convert from long to int" Because they don't do the same thing. Compound assignment operators have an implicit cast in... more 10/5/2013 11:10:57 AM

You can't, as far as I'm aware. C# only "knows" about methods declared in types - not at the top level. Move your method into a type. more 10/5/2013 11:02:34 AM

Naturally with a GUI you wont have a console loaded unless you run the command I put above, so if you are having a lot of print statements, does it still affect the speed of your program, and are they still printed? The best answer... more 10/5/2013 7:18:55 AM

If the input is terminated - which would be the case if standard input is actually being redirected from a file, for example - then it's fine. BufferedReader.readLine will still return the last line from its input, when it detects the end... more 10/5/2013 6:48:42 AM

The two pieces of code aren't quite equivalent. Even though you only call item.isSomething() as many times as you need to (contrary to my original answer), the first version still keeps trying to iterate over the rest of the... more 10/4/2013 4:53:11 PM

Look at your three methods: static void go(StringBuilder s1){ s1.append("Builder"); } static void go1(Integer s2){ s2 = 1; } static void go2(testobject s3){ s3.x = 5; } In go and go2, you're making a modification to the... more 10/4/2013 4:46:26 PM

If you know your usedElements list is in ascending order, the simplest approach would be to remove the elements in reverse order - that way the "shuffling up" effect won't affect any of the later operations: List<Double> elements =... more 10/4/2013 4:32:52 PM