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Understanding Functions in Java: Wake-Up Routine Example and Insertion Sort

This lecture focuses on functions in Java, using a relatable wake-up routine as an example. It introduces key concepts such as function definition, modifiers, and void return types. The session explores the construction of simple functions such as `printPhraseCharacters` and `areaOfCircle`, demonstrating how to define and call functions. Additionally, we cover nested loops and arrays in the context of performing an insertion sort. By the end of this lecture, you'll have a clearer understanding of how to create and use functions effectively in Java programming.

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Understanding Functions in Java: Wake-Up Routine Example and Insertion Sort

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Presentation Transcript

  1. COP3502: Introduction to CIS I Lecture 7

  2. functions

  3. public class wakeUp { public static voidmain(Stringargs[]) { getOutOfBed(); brushTeeth(); takeShower(); makeCoffee(); eatBreakfast(); } }

  4. function definition

  5. “void” functions <modifiers> void<function name> ( <arg type> <arg name> , …) { <function body> } public static voidprintPhraseCharacters(Stringphrase) { char characters[] = phrase.toCharArray(); for (inti = 0; i < characters.length; i++) { System.out.println(characters[i]); } }

  6. function call public class printTest { public static voidmain(Stringargs[]) { StringmyName = “Sean”; printPhraseCharacters(myName); } }

  7. public class printTest { public static voidmain(Stringargs[]) { ….. } public static voidprintPhraseCharacters(String phrase) { ….. } }

  8. functions w/ return values <modifiers> <return type> <function name> ( <arg type> <arg name> , …) { <function body> } public static doubleareaOfCircle(doubleradius) { double area = Math.PI * (radius * radius); return area; }

  9. return keyword returnexpression; return x; return x + 5; returnrandomNumber();

  10. function call public class printTest { public static voidmain(Stringargs[]) { double radius = 5.2; double area = areaOfCircle(radius); } }

  11. nested loops

  12. arrays … 9 0 1 2 3 4 7 8 5 6

  13. java commandLineTest Happy happy joy joy 0 1 2 3

  14. int[] list = {8, 4, 1, 7, 3, 2} int list[] = {8, 4, 1, 7, 3, 2} 0 1 2 3 4 5

  15. sorting

  16. insertion sort build sorted list one element at a time

  17. insertion sort build sorted list one element at a time

  18. insertion sort if (red < green arrow) { SWAP }

  19. insertion sort if (red < green arrow) { SWAP }

  20. insertion sort if (red < green arrow) { SWAP }

  21. insertion sort if (red < green arrow) { SWAP }

  22. insertion sort if (red < green arrow) { SWAP }

  23. insertion sort if (red < green arrow) { SWAP }

  24. insertion sort if (red < green arrow) { SWAP }

  25. insertion sort if (red < green arrow) { SWAP }

  26. insertion sort if (red < green arrow) { SWAP }

  27. insertion sort if (red < green arrow) { SWAP }

  28. insertion sort if (red < green arrow) { SWAP }

  29. insertion sort if (red < green arrow) { SWAP }

  30. insertion sort if (red < green arrow) { SWAP }

  31. insertion sort if (red < green arrow) { SWAP }

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