There is no automated uninstaller. You have to remove Eclipse manually by deleting some directories and files. Note: I use Unix style paths in this answer but the locations should be the same on Windows or Unix systems, so ~ refers to the user home directory even on Windows. Why is there no uninstaller? According … Read more
replace will replace all instances of a letter. All you need to do is use substring():
While there are IPv6 equivalents for the IPv4 address range, you can’t convert all IPv6 addresses to IPv4 – there are more IPv6 addresses than there are IPv4 addresses. The only sane way around this issue is to update your application to be able to understand and store IPv6 addresses.
I am having problems converting this formula V = 4/3 π r^3. I used Math.PI and Math.pow, but I get this error: ‘;’ expected Also, the diameter variable doesn’t work. Is there an error there?
They are absolutely different. Inheritance is an “is-a” relationship. Composition is a “has-a”. You do composition by having an instance of another class C as a field of your class, instead of extending C. A good example where composition would’ve been a lot better than inheritance is java.util.Stack, which currently extends java.util.Vector. This is now … Read more
This question already has answers here: What is a NullPointerException, and how do I fix it? (12 answers) Closed 4 years ago. i am creating to create a hotel reservation system ,but evey time i run my project i recieve “Exception in thread “AWT-EventQueue-0″ java.lang.NullPointerException” and i have not been able to find why . … Read more
No, not quite. Firstly, there’s a slight difference in semantics. If a is null, then a.concat(b) throws a NullPointerException but a+=b will treat the original value of a as if it were null. Furthermore, the concat() method only accepts String values while the + operator will silently convert the argument to a String (using the … Read more
java is part of the JRE, not the JDK. You need to add the JDK bin to the system PATH, in “Control Panel” | System | Advanced | “Environment Variables”
es, you can. That should work. . = any char except newline \. = the actual dot character .? = .{0,1} = match any char except newline zero or one times .* = .{0,} = match any char except newline zero or more times .+ = .{1,} = match any char except newline one or … Read more
This behavior is explicitly documented in String.split(String regex) (emphasis mine): This method works as if by invoking the two-argument split method with the given expression and a limit argument of zero. Trailing empty strings are therefore not included in the resulting array. If you want those trailing empty strings included, you need to use String.split(String … Read more