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TurkuBasicOOPinJava / Week 3: Objects, files and exceptions

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System.out.println("<menu item i>");
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String[] arrKeys = numbers.keySet().toArray(new String[0]); Arrays.sort(arrKeys);
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containsKey get
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Create 20. Phone book 2: Searching for a number
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public static void addNumber(HashMap<String,String> numbers)
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Create 18b. Add numbers to list 2
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Create 18a 3 Types Exceptions, TRY-CATCH, throws FileNotFoundException
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Create 17b. Read numbers from a file
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String row = reader.nextLine(); String[] chunks = row.split(","); Integer.valueOf(chunk);
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Scanner reader = new Scanner(new File("fileName.txt")); list.add(reader.nextLine());
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Scanner reader = new Scanner(new File("fileName.txt")); list.add(reader.nextLine());
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Create 16a Files and exceptions
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abs exp log floor max signum negateExact
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Math.PI; Math.pow
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Create 14b Starsquare
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StringBuilder str = new StringBuilder("<urStr>");
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r.nextInt(39)
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Random.nextInt(upToButNotIncl)
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HashMap<String, Integer>; put get containsKey keySet(=k ONLY)
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for (String city : cityNTemps.keySet())
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HashMap<String, Integer> map = new HashMap<>();
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HashMap<String, Integer>; put get containsKey keySet(= k-v pair)
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Create 10. Array from list
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Create 9b. Sum of array elements
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String[] names = new String[16]; arr.length; list.size(); str.length();
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newList.addAll(list1); Collections.sort(newList)
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"" + someInt; Integer.parseInt(str)
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Create 6B. Create a list
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ArrayList<String> list = new ArrayList<>();
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Collections.min/max, THEN go through list to find secondSmallest
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eg change order
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get, remove
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ArrayList<Integer> lista = new ArrayList<>(); for (int l : pa) lista.add(l);
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someMethod(ArrayList<Integer> list)
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Create 1b. Calculator
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obj1.equals(obj2)
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