public class DevolverVector {

	int grade = 3;
	int[] p= {1,2,3,4};
	
	//COEFICIENTES
	public int[] coeficientes(){
		int[] vector = new int[grade+1];
		for (int i = 0; i<grade+1; i++){
			vector[i]=p[i];
		}
		return vector;
	}
	
	
	public static void main(String[] args) {
		DevolverVector dv = new DevolverVector();
		
		int[] test = dv.coeficientes();
		
		System.out.println( "Posición de memoria en la VM:" );
		System.out.println( test );
		
		System.out.println();
		System.out.println( "Elementos del array:" );
		for (int i = 0 ; i < test.length ; i++ ) {
			System.out.print(test[i]);
			if ( i < test.length - 1 ) {
				System.out.print(",");
			}
		}
		
	}
	
}

Posición de memoria en la VM:
[I@3487a5cc

Elementos del array:
1,2,3,4