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Getting the IP address of the current machine using Java
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import java.net.DatagramSocket;
import java.net.InetAddress;
try(final DatagramSocket socket = new DatagramSocket()){
socket.connect(InetAddress.getByName("8.8.8.8"), 10002);
ip = socket.getLocalAddress().getHostAddress();
}
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Difference between String#equals and String#contentEquals methods
... So, is it like the operators == (contentEquals) and === (equals) in javascript?
– anestv
Dec 23 '13 at 19:04
2
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What's the difference between Thread start() and Runnable run()
...Thread#start() ,nothing really relative to os thread happens? It is only a java object.
– Jaskey
Dec 6 '14 at 9:38
4
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Convert String to Uri
How can I convert a String to a Uri in Java (Android)? i.e.:
6 Answers
6
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Are “while(true)” loops so bad? [closed]
I've been programming in Java for several years now, but I just recently returned to school to get a formal degree. I was quite surprised to learn that, on my last assignment, I lost points for using a loop like the one below.
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GoTo Next Iteration in For Loop in java
Is there a token in java that skips the rest of the for loop?
Something like VB's Continue in java.
6 Answers
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java: HashMap not working
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You can't use primitive types as generic arguments in Java. Use instead:
Map<String, Integer> myMap = new HashMap<String, Integer>();
With auto-boxing/unboxing there is little difference in the code. Auto-boxing means you can write:
myMap.put("foo", 3);
instead...
Is there something like Annotation Inheritance in java?
...ing them all the way. See Why is it not possible to extend annotations in Java?
However, types do inherit the annotations of their superclass if those annotations are @Inherited.
Also, unless you need those methods to interact, you could just stack the annotations on your class:
@Move
@Page
publ...
Apache POI Excel - how to configure columns to be expanded?
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Warning about autoSizeColumn, this requires java Font be available. This is not part of the headless java jre used on servers and will throw a NullPointerException.
– Stephen Dillon
Oct 2 '17 at 20:28
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Android Fatal signal 11 (SIGSEGV) at 0x636f7d89 (code=1). How can it be tracked down?
...ading issue related to tracking those hashes, but it turned out it was the java.security.MessageDigest class! It's not thread safe!
I swapped it out with a UID I was stuffing in every packet based on the device UUID and a timestamp. No problems since.
I guess the lesson I can impart to those that ...