6 This Quick Reference looks pretty good if you're looking for a language reference. It's especially geared towards the user interface portion of the API. For the complete API, however, I always use …

It's a bit difficult to implement a deep object copy function. What steps you take to ensure the original object and the cloned one share no reference?

Sep 3, 2008 · To me, saying that an object's reference is passed by value is the same as saying that the object is passed by reference. I'm a Java novice, but I presume that (in contrast) primitive data is …

Jun 24, 2015 · numbers.forEach(x -> System.out.println(x)); Here, you don't actually need the name x in order to invoke println for each of the elements. That's where the method reference is helpful - the :: …

Jan 1, 2012 · This is one way you can avoid null pointers. with & and ¦ both operands are always evaluated with && and ¦¦ the second operand is only evaluated when it is necessary Here's a link to a …

For deep cloning (clones the entire object hierarchy): commons-lang SerializationUtils - using serialization - if all classes are in your control and you can force implementing Serializable. Java …

A bound non-static method reference refers to a non-static method that's bound to a receiver object. Its syntax is objectName::instanceMethodName, where objectName identifies the receiver and …

If you have a Boolean reference, Boolean.toString(boolean) will throw NullPointerException if your reference is null. As the reference is unboxed to boolean before being passed to the method. While, …

Apr 16, 2012 · System.out.println(list) should print all the standard java object types (String, Long, Integer etc). In case, if we are using custom object types, then we need to override toString() method …

0 In Java "this" is a predefined variable. If we use "this" in method that's mean we are getting the reference (address) of the currently running object. For an example. this.age ---> age of the currently …