What are variable length parameters in java?

Indefinite length parameters in java

Indefinite length parameters are parameters with no specified length.

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 the variable-length parameter. In fact, this variable-length parameter is a For arrays, the compiler will treat the form (int...a) as the form (int[] a).

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:

Recommended learning: Java video tutorial

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