Initialize part of an array in java
You can do something like this, it will create array with new size based on provided. The output will be:
java
Java 8 Iterable.forEach() vs foreach loop
The better practice is to use for-each. Besides violating the Keep It Simple, Stupid principle, the new-fangled forEach() has at least the following deficiencies: Can’t use non-final variables. So, code like the following can’t be turned into a forEach lambda: Can’t handle checked exceptions. Lambdas aren’t actually forbidden from throwing checked exceptions, but common functional … Read more
How does the Java ‘for each’ loop work?
Note that if you need to use i.remove(); in your loop, or access the actual iterator in some way, you cannot use the for ( : ) idiom, since the actual iterator is merely inferred. As was noted by Denis Bueno, this code works for any object that implements the Iterable interface. Note that if … Read more
How to initialize an array in Java?
The above is not correct (syntax error). It means you are assigning an array to data[10] which can hold just an element. If you want to initialize an array, try using Array Initializer: Notice the difference between the two declarations. When assigning a new array to a declared variable, new must be used. Even if … Read more
How do I determine whether an array contains a particular value in Java?
Warning: this doesn’t work for arrays of primitives (see the comments). Since java-8 you can now use Streams. To check whether an array of int, double or long contains a value use IntStream, DoubleStream or LongStream respectively. Example
How do I “decompile” Java class files? [closed]
www.javadecompilers.com lists JAD as being: the most popular Java decompiler, but primarily of this age only. Written in C++, so very fast.Outdated, unsupported and does not decompile correctly Java 5 and later So your mileage may vary with recent jdk (7, 8). The same site list other tools. And javadecompiler, as noted by Salvador Valencia … Read more
How does System.out.print() work?
System.out is just an instance of PrintStream. You can check its JavaDoc. Its variability is based on method overloading (multiple methods with the same name, but with different parameters). This print stream is sending its output to so called standard output. In your question you mention a technique called variadic functions (or varargs). Unfortunately that … Read more
Is GNU’s Java Compiler (GCJ) dead? [closed]
You could use IKVM and Mono’s ahead of time compiler to generate native code. EDIT There is an example at the bottom of this page.
How to uninstall Eclipse?
There is no automated uninstaller. You have to remove Eclipse manually by deleting some directories and files. Note: I use Unix style paths in this answer but the locations should be the same on Windows or Unix systems, so ~ refers to the user home directory even on Windows. Why is there no uninstaller? According to this discussion … Read more
How to use Collections.sort() in Java?
Use this method Collections.sort(List,Comparator) . Implement a Comparator and pass it to Collections.sort(). Then use the Comparator as