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Builder Pattern in Effective Java
I have recently started to read Effective Java by Joshua Bloch. I found the idea of the Builder pattern [Item 2 in the book] really interesting. I tried to implement it in my project but there were compilation errors. Following is in essence what I was trying to do:
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Why should a Java class implement comparable?
Why is Java Comparable used? Why would someone implement Comparable in a class? What is a real life example where you need to implement comparable?
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How to cast an Object to an int
How can I cast an Object to an int in java?
19 Answers
19
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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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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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Resolving ambiguous overload on function pointer and std::function for a lambda using +
...erence is observable by a program, then it's illegal. Once I asked in comp.lang.c++.moderated if a closure type could add a typedef for result_type and the other typedefs required to make them adaptable (for instance by std::not1). I was told that it could not because this was observable. I'll try t...
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...