Breakout 1972 1976 Over 10,000 students Due in week 5 of CS106A - - PowerPoint PPT Presentation

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Breakout 1972 1976 Over 10,000 students Due in week 5 of CS106A - - PowerPoint PPT Presentation

Sep 04, 2023 237 likes •764 views

Breakout 1972 1976 Over 10,000 students Due in week 5 of CS106A Big program. Do it in parts 1 2 3 getCollidingObject 4 GObject collider = getElementAt( x , y ); , , a brick null Pro Tips v Want to wait for a click to start? Use

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Breakout

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1972 1976

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Over 10,000 students Due in week 5 of CS106A

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Big program. Do it in parts

1 2 3

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getCollidingObject

4 GObject collider = getElementAt(x, y); null a brick

, ,

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Pro Tips

v Want to wait for a click to start? Use waitForClick() v Do not animate in mouse moved! v Use instance var for paddle. v Make sure to test as you go. Program one milestone at a time. v No instance variable for bricks

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How do you know if you hit a brick?

4 GObject collider = getElementAt(x, y); null a brick

, ,

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Aside: Secret to how memory really works

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Who thinks this prints true?

public void run() { int x = 5; int y = 5; println(x == y); }

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Who thinks this prints true?

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Who thinks this prints true?

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Stack Diagrams

run

public void run() { println(toInches(5)); } private int toInches(int feet){ int result = feet * 12; return result; }

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Stack Diagrams

run

public void run() { println(toInches(5)); } private int toInches(int feet){ int result = feet * 12; return result; }

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Stack Diagrams

run toInches feet

5

public void run() { println(toInches(5)); } private int toInches(int feet){ int result = feet * 12; return result; } f

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Stack Diagrams

run toInches feet

5

result

public void run() { println(toInches(5)); } private int toInches(int feet){ int result = feet * 12; return result; } f

60

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Stack Diagrams

run toInches feet

5

result

public void run() { println(toInches(5)); } private int toInches(int feet){ int result = feet * 12; return result; } f

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s t a c k

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Stack Diagrams

run

public void run() { println(toInches(5)); } private int toInches(int feet){ int result = feet * 12; return result; } f

60

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Aside: Actual Memory

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What is a bucket

feet 5

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What is a bucket

feet

1011100111100011 0011010110010100 * Each bucket or “word” holds 64 bits ** don’t think on the binary level (yet)

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variables have fixed size buckets to store values

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Piech, CS106A, Stanford University

Primitives vs Classes

Primitive Variable Types Class Variable Types int double char boolean GRect GOval Gline Color Class variables (aka objects)

  • 1. Have upper camel case types
  • 2. You can call methods on them
  • 3. Are constructed using new
  • 4. Are stored in a special way
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Piech, CS106A, Stanford University

Primitives vs Classes

Primitive Variable Types Class Variable Types int double char boolean GRect GOval Gline Color Class variables (aka objects)

  • 1. Have upper camel case types
  • 2. You can call methods on them
  • 3. Are constructed using new
  • 4. Are stored in a special way

aka Objects

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Piech, CS106A, Stanford University Key:

How do you share wikipedia articles?

Antelope Canyon Article https://en.wikipedia.org/wiki/Antelope_Canyon

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Piech, CS106A, Stanford University

public void run() { GImage img = new GImage(”mountain.jpg”); add(img, 0, 0); } run heap stack

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Piech, CS106A, Stanford University

public void run() { GImage img = new GImage(”mountain.jpg”); add(img, 0, 0); } run heap stack

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Piech, CS106A, Stanford University

public void run() { GImage img = new GImage(”mountain.jpg”); add(img, 0, 0); } run heap stack

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Piech, CS106A, Stanford University

public void run() { GImage img = new GImage(”mountain.jpg”); add(img, 0, 0); } run heap stack

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Piech, CS106A, Stanford University

public void run() { GImage img = new GImage(”mountain.jpg”); add(img, 0, 0); } run heap stack 42

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Piech, CS106A, Stanford University

public void run() { GImage img = new GImage(”mountain.jpg”); add(img, 0, 0); } run heap stack 42 img

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Piech, CS106A, Stanford University

public void run() { GImage img = new GImage(”mountain.jpg”); add(img, 0, 0); } run heap stack 42 img 42

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Piech, CS106A, Stanford University

public void run() { GImage img = new GImage(”mountain.jpg”); add(img, 0, 0); } run img heap stack 42 42

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Piech, CS106A, Stanford University

public void run() { GImage img = new GImage(”mountain.jpg”); add(img, 0, 0); } run img heap stack 42 42

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Piech, CS106A, Stanford University

public void run() { GImage img = new GImage(”mountain.jpg”); add(img, 0, 0); } run img heap stack 42 42

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Piech, CS106A, Stanford University

public void run() { GImage img = new GImage(”mountain.jpg”); add(img, 0, 0); } heap stack 42

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Piech, CS106A, Stanford University

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Piech, CS106A, Stanford University

Who thinks this prints true?

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Piech, CS106A, Stanford University

Who thinks this prints true?

memory.com/18

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Piech, CS106A, Stanford University

Who thinks this prints true?

memory.com/18

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Piech, CS106A, Stanford University

Who thinks this prints true?

instance vars first memory.com/18 18

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Piech, CS106A, Stanford University

Who thinks this prints true?

instance vars first memory.com/18 18

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Piech, CS106A, Stanford University

Who thinks this prints true?

instance vars first memory.com/18 18 run

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Piech, CS106A, Stanford University

Who thinks this prints true?

instance vars first memory.com/18 18 run

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Piech, CS106A, Stanford University

Who thinks this prints true?

instance vars first memory.com/18 18 run

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Piech, CS106A, Stanford University

Who thinks this prints true?

instance vars first memory.com/18 18 run

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Piech, CS106A, Stanford University

Who thinks this prints true?

instance vars first memory.com/18 18 run second 18

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Piech, CS106A, Stanford University

Who thinks this prints true?

instance vars first memory.com/18 18 run second 18

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