Chapter 10, Problem 15PE

Program Plan Intro

A modified version of “Grid” class

Program plan:

• In a file “Grid.java”,
  • Create a package.
  • Import necessary default packages.
  • Create a class “Grid”,
    • Create “ArrayList”.
    • Define the constructor to set the grid.
    • Define a method “add()”,
      • Assign null value to Row object.
      • Create loop to iterate over grid row,
        • Check whether the row is a specified row,
        • • If it is true, assign the row.
      • Check whether the row is null,
        • If it is true, assign the new row.
        • Add that row into the list.
      • Call the method “setColumn()”.
    • Define a method “getDescription()”,
      • Make a loop to iterate over row,
        • Check whether the row is a specified row,
        • • If it is true, return the description at the location ina grid.
      • Return null value.
    • Define the method “getDescribedLocations()”,
      • Create “ArrayList” to gather the location.
      • Create loop to iterate over row in a grid,
        • Add the location to the list.
      • Return the list that has the location.
    • Create an inner class “Location”,
      • Declare the necessary variables.
      • Define the constructor to set the location.
      • Define the method “getRow()” to return the row.
      • Define the method “getColumn()” to return the column.
    • Create an inner class “Row”,
      • Declare the necessary variable.
      • Create ArrayList.
      • Define the constructor to create an unbounded row.
      • Define the method “setColumn()” to set the column,
        • Initialize the necessary variables.
        • Create loop to iterate over columns,
        • • Execute for true,
            • Check whether the column number is a specified column,
              • If it is true, set the Boolean value to true.
            • Otherwise, increase the column index.
        • Check whether the column index is less than the column size,
        • • If it is true, set the column.
        • Otherwise, add into the list.
      • Define the method “getDescription()” ,
        • Create a loop to iterate over columns,
        • • Return the description at a column if the column is a specified column.
        • Return null value.
      • Define the method “getRowNumber()”  to return the row.
      • Define the method “getDescribedLocations()”  to return the list that contain the location that are described.
  • Create an inner class “RowColumn”,
    • Declare the necessary variables.
    • Define the constructor to create a column in a row.
    • Define the method “getColumnNumber()”  to return the column number.
    • Define the method “getDescription()”  to return the description.
• In a file “GridTest.java”, create a package and then a class “GridTest”,
  • Define the method “main()”,
    • Create object for “Grid” class.
    • Add the description into the grid.
    • Print the description for the location (0, 1).
    • Print the expected description.
    • Print the description for the location (1, 2).
    • Print the expected description.
    • Print the description for the location (2, 1).
    • Print the expected description.
    • Create loop to iterate over grid location that contain description,
      • Print the grid location.
    • Print new line.
    • Print the expected grid location.