How to use variable length parameters in java

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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