How to use variable-length parameters in java
The syntax of the variable-length parameter method is as follows:
返回值 方法名(参数类型...参数名称)
Use the "..." form in the parameter list to define variable-length parameters. In fact, the variable-length parameter a is an array. The compiler will regard the form (int...a) as (int[] a) form.
Example: Write a variable-length parameter method.
/** * 定义不定长参数方法 * * @author pan_junbiao * */ public class MyTest { public static int add(int... a) { int s = 0; for (int i = 0; i < a.length; i++) { s += a[i]; } return s; } public static void main(String[] args) { // 调用不定长参数方法 System.out.println("调用不定长参数方法:" + add(1, 2, 3, 4, 5, 6, 7, 8, 9)); System.out.println("调用不定长参数方法:" + add(1, 2)); } }
Running results:
调用不定长参数方法:45 调用不定长参数方法:3
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