G4G0-1/Semester 2/Programming 2/Assessment 3 Revision/Parameter Passing WS3.md

Exercise 1

class Param6
{
	private int x, y;
	public Param6(int a, int b)
	{
		x = b;
		y = a;
	}
	
	public Param6(int a)
	{
		this(a, 5);
	}
	
	public void method1(int x)
	{
		y = y + x;
		System.out.println(y); 
		this.x = this.x + x;
		x = method2(y);
		System.out.println(x);
		System.out.println(this.x);
	}
	
	public int method2(int x)
	{
		return x + y;
	}
}

Param6 q6 = new Param6(3); q6.method1(4);

Param6(3) = Param6(3, 5) x = 5, y = 3 //Field Variables

method1(4), x = 4 //Local y = 3 + 4 = 7 output 7 this.x = 5 + 4 = 9 local x = method2(7) = 7 + 7 = 14 output 14 output 9

Exercise 2

public int[] arrayMethod1(int size)
{
	int[] numbers = new int[size]; //B
	for (int k = 0; k < size; k++)
		numbers[k] = k*k; 
		//C
	return numbers;
}

int[] arrayOfNumbers = arrayMethod1(5); //A

Draw three state-of-memory diagrams to indicate the complete situation immediately after B has been executed, at C i.e. immediately before returning from the method,and finally after statement A has been fully executed. This is the order in which the statements above are executed.

B) | numbers | -> int[] k=0, while k < 5, k increment numbers[0] = 0 numbers[1] = 1 numbers[2] = 4 numbers[3] = 9 numbers[4] = 16 C) | numbers | -> 0,1,4,9,16 A) | arrayOfNumbers | -> 0,1,4,9,16