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CÁC CÂU LỆNH - Coggle Diagram

- - - - VD1: Random 0→9
        ↓
        int number = rd.nextInt(10);
      - VD2: Random [a,b]
        ↓
        int number = a + rd.nextInt(b - a + 1)
    - - VD: int[] digits = {12, 14, 20, 5, 21};
        ↓
        int dgtRdm = rd.nextInt(digits.length);
    - - VD:
        ↓
        String value = " " + rd.nextInt(10) + rd.nextInt(10) + rd.nextInt(10);
  - - - Declare & init an empty int[ ] object with length = 4
        
        VD: int[ ] digits = new int[4];
        
        int[ ] → object type
        each element → int type (primitive type)
        fixed length and same data type
        
        Gán lại giá trị:
        ↓
        digits[2] = 99;
        
        Trên vùng nhớ HEAP → digits[0], digits[1], digits[2], digits[3] đều mang giá trị mặc định int → = 0
      - Declare & init an int[ ] object with length = 6 and given values
        
        VD: int[ ] numbers = {1, 9, 4, 7, 5, 6};
        System.out.println("numbers[3]: " + numbers[3]); // 7
      - Many elements => loop (duyệt từng phần tử)
        
        for >> index → get index and value
        
        for >> each → only get value
        ↓
        for (type variable : arrayname) {...}
    - - VD:
        Item itemA = new Item(123, "Item 123", 720);
        Item itemB = new Item(234, "Item 234", 260);
        Item itemC = new Item(345, "Item 345", 100);
        ↓
        Item[ ] items = { itemA, itemB, itemC };
      - usually use "for >> each"