Java array initialization within argument list

Question

How come the first call to someMethod doesn\'t compile without being explicit that it\'s String[]?

It\'s fine to use an array initializer to create a String[] arra

Answer 1

If you don't want to use explicit String[], use:

public void someMethod(String... arr){
    //do some magic
}
…
someMethod("cm", "applicant", "lead");

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The three periods after the final parameter's type indicate that the final argument may be passed as an array or as a sequence of arguments.

Read more.

Answer 2

You can use the curly braces to initialize an array. In every else case it is used to define blocks of statments.

Answer 3

You can only use the { "hello", "world" } initialization notation when declaring an array variable or in an array creation expression such as new String[] { ... }.

See Section 10.6 Array Initializers in the Java Language Specification:

An array initializer may be specified in a declaration, or as part of an array creation expression (§15.10), creating an array and providing some initial values

Answer 4

Or you can use varargs:

public void someMethod(String... arr){
    //do some magic
}

public void makeSomeMagic(){
    someMethod("cat", "fish", "cow");
}

It's basically a fancy syntax for an array parameter (vararg must be the last parameter in method signature).