我必须填写项目的代码。我已经输入了我认为适合第一部分代码的内容，但我仍然感到困惑，因为它没有弹出正确的图形。
NestedLayoutPractice类
/* Practice using layouts
Anderson, Franceschi
*/
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class NestedLayoutPractice extends JFrame
{
private Container contents;
private Game game;
private BorderLayout bl;
private JLabel bottom;
// ***** Task 1: declare a JPanel named top
// also declare three JButton instance variables
// that will be added to the JPanel top
// these buttons will determine the grid size of the game:
// 3-by-3, 4-by-4, or 5-by-5
private JPanel top;
private JButton [] topButtons;
private String [] topGridSize =
{"3-by-3",
"4-by-4",
"5-by-5",
};
private JButton reset;
// task 1 ends here
public NestedLayoutPractice( )
{
super( "Practicing layout managers" );
contents = getContentPane( );
// ***** Task 2: student code starts here
// instantiate the BorderLayout manager bl
// set the layout manager of the content pane contents to bl
game = new Game( 3 ); // instantiating the GamePanel object
// add panel to the center of the content pane
// task 2 ends here
bottom = new JLabel( "Have fun playing this Tile Puzzle game",
SwingConstants.CENTER );
// ***** Task 3: Student code restarts here
// instantiate the JPanel component named top
// set the layout of top to a 1-by-3 grid
// instantiate the JButtons that determine the grid size
// add the buttons to JPanel top
// add JPanel top to the content pane as its north component
// task 3 ends here
// ***** Task 5: Student code restarts here
// Note: search for and complete Task 4 before performing this task
// declare and instantiate an ActionListener
// register the listener on the 3 buttons
// that you declared in Task 1
// task 5 ends here
contents.add( bottom, BorderLayout.SOUTH );
setSize( 325, 325 );
setVisible( true );
}
// ***** Task 4: Student code restarts here
// create a private inner class that implements ActionListener
// your method should identify which of the 3 buttons
// was the source of the event
// depending on which button was pressed,
// call the setUpGame method of the Game class
// with arguments 3, 4, or 5
// the API of that method is:
// public void setUpGame( int nSides )
// task 4 ends here
public static void main( String [] args )
{
NestedLayoutPractice nl = new NestedLayoutPractice( );
nl.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
}
}
TilePuzzle Class
/* TilePUzzle class
Anderson, Franceschi
*/
public class TilePuzzle
{
private int side; // grid size for game 1
private String[][] tiles;
private int emptyRow;
private int emptyCol;
public TilePuzzle( int newSide )
{
setUpGame( newSide );
}
public void setUpGame( int newSide )
{
if ( side > 0 )
side = newSide;
else
side = 3;
side = newSide;
tiles = new String[side][side];
emptyRow = side - 1;
emptyCol = side - 1;
for ( int i = 0; i < side; i++ )
{
for ( int j = 0; j < side; j++ )
{
tiles[i][j] = String.valueOf( ( side * side )
- ( side * i + j + 1 ) );
}
}
// set empty tile to blank
tiles[side - 1][side - 1] = "";
}
public int getSide( )
{
return side;
}
/*
public int getEmptyRow( )
{
return emptyRow;
}
public int getEmptyCol( )
{
return emptyCol;
}
*/
public String[][] getTiles( )
{
return tiles;
}
public boolean tryToPlay( int row, int col )
{
if ( possibleToPlay( row, col ) )
{
// play: switch empty String and tile label at row, col
tiles[emptyRow][emptyCol] = tiles[row][col];
tiles[row][col] = "";
emptyRow = row;
emptyCol = col;
return true;
}
else
return false;
}
public boolean possibleToPlay( int row, int col )
{
if ( ( col == emptyCol && Math.abs( row - emptyRow ) == 1 )
|| ( row == emptyRow && Math.abs( col - emptyCol ) == 1 ) )
return true;
else
return false;
}
public boolean won( )
{
for ( int i = 0; i < side ; i++ )
{
for ( int j = 0; j < side; j++ )
{
if ( !( tiles[i][j].equals(
String.valueOf( i * side + j + 1 ) ) )
&& ( i != side - 1 || j != side - 1 ) )
return false;
}
}
return true;
}
}
游戏课
/* Using GridLayout to organize our window
Anderson, Franceschi
*/
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Game extends JPanel
{
private JButton [][] squares;
private TilePuzzle game;
public Game( int newSide )
{
game = new TilePuzzle( newSide );
setUpGameGUI( );
}
public void setUpGame( int newSide )
{
game.setUpGame( newSide );
setUpGameGUI( );
}
public void setUpGameGUI( )
{
removeAll( ); // remove all components
setLayout( new GridLayout( game.getSide( ),
game.getSide( ) ) );
squares = new JButton[game.getSide( )][game.getSide( )];
ButtonHandler bh = new ButtonHandler( );
// for each button: generate button label,
// instantiate button, add to container,
// and register listener
for ( int i = 0; i < game.getSide( ); i++ )
{
for ( int j = 0; j < game.getSide( ); j++ )
{
squares[i][j] = new JButton( game.getTiles( )[i][j] );
add( squares[i][j] );
squares[i][j].addActionListener( bh );
}
}
setSize( 300, 300 );
setVisible( true );
}
private void update( int row, int col )
{
for ( int i = 0; i < game.getSide( ); i++ )
{
for ( int j = 0; j < game.getSide( ); j++ )
{
squares[i][j].setText( game.getTiles( )[i][j] );
}
}
if ( game.won( ) )
{
JOptionPane.showMessageDialog( Game.this,
"Congratulations! You won!\nSetting up new game" );
// int sideOfPuzzle = 3 + (int) ( 4 * Math.random( ) );
// setUpGameGUI( );
}
}
private class ButtonHandler implements ActionListener
{
public void actionPerformed( ActionEvent ae )
{
for( int i = 0; i < game.getSide( ); i++ )
{
for( int j = 0; j < game.getSide( ); j++ )
{
if ( ae.getSource( ) == squares[i][j] )
{
if ( game.tryToPlay( i, j ) )
update( i, j );
return;
} // end if
} // end inner for loop
} // outer for loop
} // end actionPerformed method
} // end ButtonHandler class
} // end Game class