Passing variable number of parameters from calling method

CosminO :

Assuming we have a method that receives at least one parameter and potentially 0 or more parameters of the same type:

public void method(T p1, T... otherPs)

And that we have a method that calls it that looks like this:

public void callingMethod(T... params) 

that we know has at least one parameter.

Is it possible to call method from callingMethod to look something like this?

public void callingMethod(T... params){
    [...]
    method(params[0], restOfParams);
    [...]
}

LppEdd :

Sure, that is possible and pretty easy.
The only overhead is the creation of another array.
See Eugene answer to understand the memory consumption.

---

public void callingMethod(T... params){
    ...
    method(params[0], Arrays.copyOfRange(params, 1, params.length));
    ...
}

---

A bit off topic, but I just run JOL, as suggested, and here is the output for an empty references' array

final String[] array = new String[0];

---

# Running 64-bit HotSpot VM.
# Using compressed oop with 3-bit shift.
# Using compressed klass with 0x0000000800000000 base address and 0-bit shift.
# Objects are 8 bytes aligned.
# Field sizes by type: 4, 1, 1, 2, 2, 4, 4, 8, 8 [bytes]
# Array element sizes: 4, 1, 1, 2, 2, 4, 4, 8, 8 [bytes]

[Ljava.lang.String;@7ea37dbfd object externals:
          ADDRESS       SIZE TYPE                PATH                           VALUE
        71695b2d0         16 [Ljava.lang.String;                                []

For an array with a single, null, element

final String array = new String[1];

---

[Ljava.lang.String;@7ea37dbfd object externals:
          ADDRESS       SIZE TYPE                PATH                           VALUE
        71692a7a8         24 [Ljava.lang.String;                                [null]

For an array containing a single, non-null, element

final String array = new String[1];
array[0] = new String("");

---

[Ljava.lang.String;@7ea37dbfd object externals:
          ADDRESS       SIZE TYPE                PATH                           VALUE
        707612b68         16 [B                  [0].value                      []
        707612b78    1577856 (something else)    (somewhere else)               (something else)
        707793ef8         24 [Ljava.lang.String;                                [(object)]
        707793f10         24 java.lang.String    [0]                            (object)