This creates a “See Also” heading containing the link, i.e.: /** * @see <a href=”http://google.com”>http://google.com</a> */ will render as: See Also: http://google.com whereas this: /** * See <a href=”http://google.com”>http://google.com</a> */ will create an in-line link: See http://google.com
You can use Jackson’s class-level annotation: import com.fasterxml.jackson.annotation.JsonIgnoreProperties @JsonIgnoreProperties class { … } It will ignore every property you haven’t defined in your POJO. Very useful when you are just looking for a couple of properties in the JSON and don’t want to write the whole mapping. More info at Jackson’s website. If you want to … Read more
From JDK 7 you can use Files.readAllBytes(Path). Example: import java.io.File; import java.nio.file.Files; File file; // …(file is initialised)… byte[] fileContent = Files.readAllBytes(file.toPath());
Here’s the problem when I get too carried away with anonymous inner classes: 2009/05/27 16:35 1,602 DemoApp2$1.class 2009/05/27 16:35 1,976 DemoApp2$10.class 2009/05/27 16:35 1,919 DemoApp2$11.class 2009/05/27 16:35 2,404 DemoApp2$12.class 2009/05/27 16:35 1,197 DemoApp2$13.class /* snip */ 2009/05/27 16:35 1,953 DemoApp2$30.class 2009/05/27 16:35 1,910 DemoApp2$31.class 2009/05/27 16:35 2,007 DemoApp2$32.class 2009/05/27 16:35 926 DemoApp2$33$1$1.class 2009/05/27 16:35 4,104 … Read more
Create a copy constructor: class DummyBean { private String dummy; public DummyBean(DummyBean another) { this.dummy = another.dummy; // you can access } } Every object has also a clone method which can be used to copy the object, but don’t use it. It’s way too easy to create a class and do improper clone method. … Read more
There is a slight difference in the ordering of the bytecode. 2 * (i * i): iconst_2 iload0 iload0 imul imul iadd vs 2 * i * i: iconst_2 iload0 imul iload0 imul iadd At first sight this should not make a difference; if anything the second version is more optimal since it uses one … Read more
That’s because the Scanner.nextInt method does not read the newline character in your input created by hitting “Enter,” and so the call to Scanner.nextLine returns after reading that newline. You will encounter the similar behaviour when you use Scanner.nextLine after Scanner.next() or any Scanner.nextFoo method (except nextLine itself). Workaround: Either put a Scanner.nextLine call after … Read more
.values() You can call the values() method on your enum. for (Direction dir : Direction.values()) { // do what you want } This values() method is implicitly declared by the compiler. So it is not listed on Enum doc.
Both map and flatMap can be applied to a Stream<T> and they both return a Stream<R>. The difference is that the map operation produces one output value for each input value, whereas the flatMap operation produces an arbitrary number (zero or more) values for each input value. This is reflected in the arguments to each … Read more
You can use Character.toString(char). Note that this method simply returns a call to String.valueOf(char), which also works. As others have noted, string concatenation works as a shortcut as well: String s = “” + ‘s’; But this compiles down to: String s = new StringBuilder().append(“”).append(‘s’).toString(); which is less efficient because the StringBuilder is backed by … Read more