Answered: public Block(int y, int x, int size) //…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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public Block(int y, int x, int size) // this contructor creates a 2D placeholder of null value; //these values will be populated later with calls to setTile() -- O(block_size)
public Block(int y, int x, int size, byte color) // overloaded constuctor that creates a 2D matrix with actual tile objects; //no need to call setTile afterwards -- O(block_size)
public Block scaleUp() // scales up the block (double size) -- O(block_size)

This class represents a two-dimensional tetris piece dropping into the tetris well. The
block is practically a square-size placeholder for the Tile objects. But not all the spots
are necessarily occupied. When the block is generated, we randomly pick the spots
that will be filled in with tiles. All the tiles of a block must have the same color. Lastly,
the block is dynamic which means that while it's dropping into the well it can transform
in the following ways:
•It can move left or right (one spot at a time)
•It can flip vertically or horizontally
.It can rotate clockwise (90 degrees at a time)
•It can scale up (double in size) or scale down (shrink in half, but can't become smaller
than 2x2).
public class Block
{
private DynamicArray<DynamicArray<Tile>> block; // the internal storage of the
block data
public Block(int y, int x, int size) // this contructor creates a 2D placeholder of null
value; //these values will be populated later with calls to set Tile() -- O(block_size)
public Block(int y, int x, int size, byte color) // overloaded constuctor that creates a 2D
matrix with actual tile objects; //no need to call set Tile afterwards -- O(block_size)
public int getSize() // returns the length of the side of block -- O(1)
public int getY() // returns the top-left Y-coordinate of the block -- O(1)
public int getX() // returns the top-left X-coordinate of the block -- O(1)
public void set Tile(int y, int x, Tile t) // sets the tile at location y,x-- O(1)
public Tile get Tile(int y, int x) // gets the tile from location y.x -- O(1)
public void drop0 // drops the block by one row -- O(block_size)
public void moveLeft() // moves the block one spot to the left -- O(block_size)
public void moveRight() // moves the block one spot to the right --O(block_size)
public void rotate() // rotates the block 90 degrees clockwise --O(block_size)
public void flip Vertical) // flips the block vertically -- O(block_size)
public void flipHorizontal() //flips the block horizontally -- O(block_size)
public Block scaleUp0 // scales up the block (double size) -- O(block_size)

public class DynamicArray<T>
{
}
private T[] data;
private int size;
@SuppressWarnings ("unchecked")
public DynamicArray(int size) {
}
public void set(int index, T obj){
if (index < 0 || index >= data.length) {
}
data = (T [])new Object[size];
this.size = 0;
}
}
}
throw new IndexOutOfBounds Exception (s: "Index out of bounds");
public T get(int index) {
data[index] = obj;
size++;
if (index < 0 || index >= data.length) {
throw new IndexOutOfBoundsException (s: "Index out of bounds");
}
return data[index];
public int size(){
return size;

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