Draw contour diagrams to show the state of execution prior to Line 8 of the Invoke class in Fig. 2.21 in Sect. 2.9.

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class Invoke { public static void main(String[] args) { } heged class Number ( Number num1, num2 num1 = new Number(); num2 = new Number(); num1.setx (5) ; num2. setx (7); System.out.println("Num1 System.out.println ("Num2 = private int x; public Number() { x = 0; } public void setx (int a) { x = a; | public int getX() { return x; } = + num1.getX () ); + num2.getX()); 11 11 // Line 1 // Line 2 // Line 3 // Line 4 // Line 5 // Line 6 // Line 7 // Line 8 // Line 9 // Line 10 // Line 11 // Line 12 // Line 13 // Line 14 // Line 15 // Line 16 // Line 17 // Line 18 // Line 19 // Line 20 // Line 21 // Line 22 // Line 23