Java variable parameters

Source: Internet
Author: User

Java variable parameters

Java adds new features:Variable parameters: when the number of parameters is uncertain and the type is determined, java treats variable parameters as arrays.Note: The variable parameter must be in the last one. When there is one more variable parameter, one is not the last one, so only one variable parameter is supported. Because the number of parameters is not fixed, when there are parameters of the same type behind the parameter, java cannot distinguish whether the input parameter belongs to the previous variable parameter or the latter parameter, so the variable parameter can only be placed in the last one.

Features of variable parameters:

(1) It can only appear at the end of the parameter list;

(2)... is located between the variable type and the variable name, and there are no spaces between the front and back;

(3) When a variable parameter method is called, the compiler implicitly creates an array for the variable parameter and accesses the variable parameter in an array form in the method body.

Public class Varable {
Public static void main (String [] args ){
System. out. println (add (2, 3 ));
System. out. println (add (2, 3, 5 ));
Public static int add (int x, int... args ){
Int sum = x;
For (int I = 0; I <args. length; I ++ ){
Sum + = args [I];
Return sum;

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