Campbell Ritchie wrote:
Did you read the documentation for List#toArray()? Did you see what its return type is? Did you see the strange design of its overloaded brother? For an exercise, see if you can find a version of that overloaded method for Java1.2 or Java1.3 or Java1.4 and see how it differs from the current version.
Is down casting allow here? String array2 = (String) list.toArray(); This returns an Object array.
I know that String array2 = list.toArray(new String) works by specifying the String array as a parameter for toArray() method. And it will give you a String array.
If an array variable v has type A , where A is a reference type, then v can hold
a reference to an instance of any array type B , provided B can be assigned to A
(§5.2). This may result in a run-time exception on a later assignment; see §10.5
for a discussion.
• Develop the code that use parallel stream
• Implement decomposition and reduction with stream
Yes, that was a bad example
First of all, don't use ternary statements if you're going to return booleans from them...
An enum type is a special data type that enables for a variable to be a set of predefined constants. The variable must be equal to one of the values that have been predefined for it. Common examples include compass directions (values of NORTH, SOUTH, EAST, and WEST) and the days of the week.
Because they are constants, the names of an enum type's fields are in uppercase letters.
Each enum constant is declared with values for the mass and radius parameters. These values are passed to the constructor when the constant is created. Java requires that the constants be defined first, prior to any fields or methods. Also, when there are fields and methods, the list of enum constants must end with a semicolon.