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Why do this() and super() have to be the first statement in a constructor?
Java requires that if you call this() or super() in a constructor, it must be the first statement. Why?
19 Answers
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Declaring and initializing variables within Java switches
I have a crazy question about Java switches.
6 Answers
6
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'Must Override a Superclass Method' Errors after importing a project into Eclipse
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Eclipse is defaulting to Java 1.5 and you have classes implementing interface methods (which in Java 1.6 can be annotated with @Override, but in Java 1.5 can only be applied to methods overriding a superclass method).
Go to your project/IDE preferen...
How to pass objects to functions in C++?
I am new to C++ programming, but I have experience in Java. I need guidance on how to pass objects to functions in C++.
7 A...
How to round a number to n decimal places in Java
... first looked at the DecimalFormat class is that it was only introduced in Java 1.6. Unfortunately I'm restricted to using 1.5 but it will be useful to know for the future.
– Alex Spurling
Oct 1 '08 at 13:07
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Type safety: Unchecked cast
...re would not be a warning in the first case, I'm not sure how pedantic the Java compiler is with warnings for Java 5). However, you are converting it to a HashMap<String, String>.
HashMaps are really maps that take an object as a key and have an object as a value, HashMap<Object, Object>...
Google Gson - deserialize list object? (generic type)
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Method to deserialize generic collection:
import java.lang.reflect.Type;
import com.google.gson.reflect.TypeToken;
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Type listType = new TypeToken<ArrayList<YourClass>>(){}.getType();
List<YourClass> yourClassList = new Gson().fromJson(jsonArray, listT...
PatternSyntaxException: Illegal Repetition when using regex in Java
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The { and } are special in Java's regex dialect (and most other dialects for that matter): they are the opening and closing tokens for the repetition quantifier {n,m} where n and m are integers. Hence the error message: "Illegal repetition".
You shoul...
How do I make HttpURLConnection use a proxy?
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Since java 1.5 you can also pass a java.net.Proxy instance to the openConnection(proxy) method:
//Proxy instance, proxy ip = 10.0.0.1 with port 8080
Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("10.0.0.1", 8080))...
Pretty-Print JSON in Java
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If you are using a Java API for JSON Processing (JSR-353) implementation then you can specify the JsonGenerator.PRETTY_PRINTING property when you create a JsonGeneratorFactory.
The following example has been originally published on my blog pos...