Practice Exercises Java - Learn to program performing exercises with Java

Practice Exercises Java

Learn to program performing exercises with Java

12 Lessons Java with the Solutions - 228 Exercises Java with the solutions
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Table + array + files - Practice Exercises Java

Lesson 9:

Object persistence

Exercise 9.1:

Table + array + files


Expand the exercise of January 9th (tables + array), so that it contains two new methods, to dump the data of the array into a binary file and restore the data from the file.

Source Code:

package Tables;
public class Table
	protected int width, height;

	public Table(int tableWidth, int tableHeight)
		width = tableWidth;
		height = tableHeight;

	public final void ShowData()
		System.out.printf("Width: %1$s, Height: %2$s" + "\r\n", width, height);

	public final void Save(String name)
		BinaryWriter outputFile = new BinaryWriter(File.Open(name, FileMode.Create));

	public final void Load(String name)
		BinaryReader inputFile = new BinaryReader(File.Open(name, FileMode.Open));
		height = inputFile.ReadInt32();
		width = inputFile.ReadInt32();
package Tables;
import java.util.*;

public class Main
	public static void main(String[] args)
		Table[] tableList = new Table[10];
		Random random = new Random();

		for (int i = 0; i < tableList.length - 1; i++)
			tableList[i] = new Table(random.nextInt(50, 201), random.nextInt(50, 201));
		tableList[9] = new Table(0, 0);

		for (int i = 0; i < tableList.length; i++)

		new Scanner(;
Exercisey 9.1

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