[자바] 오늘 실수한 틀린문법 찾기

다음중 틀린문법을 찾으시오.

public double average(int[] a) {
        double sum = 0;
        for (int i=0; i<a.length; i++) {
            sum += a[i];
        }       
        return sum / a;
}

public static void main(String[] args) {
  GoodCalc ca = new GoodCalc();
  System.out.println(ca.average(int[]= {10,20,30,40})); 
}

public class IPTV extends ColorTV{
	
	String address;
	
	public IPTV(int size, int color,String address) {
		this.address = address;
		super(size,color);
	}
	
}

정답

1 return sum/a.length(배열이므로)
2 (new int[] {10,20,30,40})
3 super메소드와 this참조변수 위치 변경