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Is there a Java equivalent or methodology for the typedef keyword in C++?
...redibly helpful. Do you know of a way to achieve similar functionality in Java, whether that be a Java mechanism, pattern, or some other effective way you have used?
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InputStream from a URL
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Use java.net.URL#openStream() with a proper URL (including the protocol!). E.g.
InputStream input = new URL("http://www.somewebsite.com/a.txt").openStream();
// ...
See also:
Using java.net.URLConnection to fire and handle H...
what's the correct way to send a file from REST web service to client?
...ts that I don't know where I should even begin. My REST service is made on Java and I'm using Jersey, I'm sending all the data using the JSON format.
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Java List.contains(Object with field value equal to x)
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Streams
If you are using Java 8, perhaps you could try something like this:
public boolean containsName(final List<MyObject> list, final String name){
return list.stream().filter(o -> o.getName().equals(name)).findFirst().isPresent();
}...
Best way to encode text data for XML in Java?
Very similar to this question , except for Java.
21 Answers
21
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Strings are objects in Java, so why don't we use 'new' to create them?
...ring literals [ie, Strings like "abcd" but not like new String("abcd")] in Java are interned - this means that every time you refer to "abcd", you get a reference to a single String instance, rather than a new one each time. So you will have:
String a = "abcd";
String b = "abcd";
a == b; //True
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Why is 128==128 false but 127==127 is true when comparing Integer wrappers in Java?
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When you compile a number literal in Java and assign it to a Integer (capital I) the compiler emits:
Integer b2 =Integer.valueOf(127)
This line of code is also generated when you use autoboxing.
valueOf is implemented such that certain numbers are "pooled", ...
How do I pass a class as a parameter in Java?
Is there any way to pass class as a parameter in Java and fire some methods from that class?
10 Answers
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At runtime, find all classes in a Java application that extend a base class
...n, InstantiationException {
Reflections reflections = new Reflections("java.util");
Set<Class<? extends List>> classes = reflections.getSubTypesOf(java.util.List.class);
for (Class<? extends List> aClass : classes) {
System.out.println(aClass.getName());
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Why don't Java's +=, -=, *=, /= compound assignment operators require casting?
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A likely reason to why the Java compiler adds a typecast is because if you're trying to perform arithmetic on incompatible types, there is no way of performing a typecast of the result using the contracted form. A typecast of the result is generally mo...