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获得治疗? JAVA
原标题:Access Denied? JAVA

我在学校为我的java阶级玩.,需要写上档案。 我从我以前提出的一项工作方案中抄录了一些法典,但每当我操作该守则时,我就会发现一个“接触”错误。 我的java教师说,我完全读写,可以查阅档案,但它仍然发现错误。

他的分数。 确实存在 t,其具体细节就是这样。

错误在于马克·马克特菲利的方法,在印刷作者的初创情况下是很奇怪的。 也可在支票上进行,但目前正在对这种方法发表意见。

我对该网站说几句新话,因此我不敢肯定如何制定法典,因此结果将十分dy。

Exception in thread "AWT-EventQueue-1" java.security.AccessControlException: 
    access denied  ("java.io.FilePermission" "Hiscore.txt" "write")

Code

 import java.awt.*;

 import java.awt.event.*;

 import javax.swing.*;

 import javax.swing.event.*;

 import java.io.File;

 import java.io.PrintWriter;

 import java.io.IOException;

 import java.io.FileNotFoundException;

import java.util.Scanner;



public class TowerDefence extends JApplet implements MouseListener  {

 int xpos, ypos, money, attackspawn, attackcount, lives, attackerhealth, hiscore, 
laser;        // x,y location of current square

private DrawingArea canvas;    // JPanel canvas on which to draw grid

private int[][] numbers;     

private int[][] damage;

JPanel startscreen;

File ifile, ofile, qfile;

Scanner input, output, questionreader;

boolean start, play, checkhiscore, fileexists, end, inquestionstate;

long totaldamage;

Timer timer;

boolean [][] moved;

JButton button;

public File fargle;

PrintWriter makesOutput;

 //JButton begin;



 // Constructor

 public TowerDefence( ) {

   inquestionstate = false;

 JButton begin = new JButton ("BEGIN");

 //begin = new JButton("BEGIN");

 checkhiscore = false;

 xpos = ypos = attackcount = laser = 4;        

 button = new JButton("Double Damage for 15 seconds");

 money = 200;

 attackspawn = 0;

 totaldamage = 0;

 lives = 10;

 attackerhealth = 24;

 fileexists = true;

 numbers = new int[30][30];    

 damage = new int [20][20];

 moved = new boolean  [20][20];

 Timer timer;

 end = false;

 for (int i = 0; i< 20; i++){

     for (int j = 0; j< 20; j++){

         moved[i][j] = false;

         damage [i][j] = 0;

     }

 }

 for (int i = 0; i<30; i++){

     for (int j = 0; j<30; j++){

         numbers[i][j] = 0;

     }

 }

 start = false;

 play = false;

 ifile = new File("map.txt");

 ofile = new File ("hiscore.txt");

 qfile = new File("questions.txt");

 RepaintAction action = new RepaintAction();

 timer = new Timer(1000, action);

 timer.start();

 }

 private class RepaintAction implements ActionListener {

 public void actionPerformed(ActionEvent evt) {

 repaint();  // Call the repaint() method in the panel class.

 }

 }// MANDATORY: required initialization of JApplet

 // MANDATORY: required initialization of JApplet

 public void init ( ) {

 canvas = new DrawingArea();                // create a new Drawing Area

 setContentPane(canvas);                    // connect the canvas to JApplet

 canvas.setBackground(Color.lightGray);    // make the background lightGray

 canvas.addMouseListener(this);

 canvas.requestFocus();                     // focus keyboard on JApplet 

 }

 // MANDATORY: Define DrawingArea as a JPanel

 class DrawingArea extends JPanel {

  JButton begin = new JButton ("BEGIN");

  JButton upgrade = new JButton ("upgrade");

  JComboBox selectmap = new JComboBox();

  String op1, op2 = "yodel";

  String askquestion;

  String option = "ocean";

  String findplace = "";

  JRadioButton option1, option2;

  JLabel question;

  ButtonGroup group = new ButtonGroup();

  JFrame questionframe = new JFrame();



 public void paintComponent(Graphics g) {

     super.paintComponent(g);        // MANDATORY: Must be first method called.

     if (!play&&!end){

          ReadIt1();

          StartScreen(g);

          StartButton();

      }

     if (start){

             ReadIt();

     }
    if (play){

         ChangeAttackers();

         drawGrid(g);                    

         Attack(g);

         DamageCheck();

         if (attackspawn % 15 == 0){

             SpawnAttackers();

             ReadQuestions();

         }

         LifeCheck(g);

     }

       //  CheckOutputFile();

       //if (fileexists){

              MakeOutputFile();

         //}

  if (end){

     LifeCheck(g);

          }

 }

 public void ReadQuestions(){

   if(!inquestionstate){

   try{

     questionreader = new Scanner(qfile);

   }catch(FileNotFoundException e){

     System.out.println("ERROR: cannot open file map.txt");

     System.exit(1);

   }

   while (!findplace.equalsIgnoreCase(op2)){

           findplace = questionreader.nextLine();

           }

           askquestion = questionreader.nextLine();

           op1 = questionreader.nextLine();

           op2 = questionreader.nextLine();

           System.out.println(askquestion);

           System.out.println(op1);

           System.out.println(op2);

           question = new JLabel(askquestion);

           option1 = new JRadioButton(op1);

           option2 = new JRadioButton(op2);

           questionframe.setLayout(new GridLayout(0,1));

           questionframe.removeAll();

           questionframe.getContentPane().add(question);

           questionframe.getContentPane().add(option1);

           questionframe.getContentPane().add(option2);

           questionframe.setVisible(true);

           inquestionstate = true;

           }

   }

 public void ReadIt1(){

     if (option.equalsIgnoreCase("ocean")){

         ifile = new File("oceanmap.txt");

     }

     else if (option.equalsIgnoreCase("canyon")){

         ifile = new File("map.txt");

     }

 try{

     input = new Scanner(ifile);

 }catch(FileNotFoundException e){

     System.out.println("ERROR: cannot open file map.txt");

     System.exit(1);

 }

 for (int i = 0; i<20; i++){

     for (int j = 0; j < 20; j++){

         numbers [j+5][i+5] = input.nextInt();

     }

 }

         input.close();

 }//end method ReadIt

 public void StartScreen(Graphics g){

      for (int row = 0; row < 20; row ++){

         for (int col = 0; col < 20; col ++){

             if (numbers[row+5][col+5] == 0&&option.equalsIgnoreCase("canyon")){

                 g.setColor(Color.green);

             }

             else if (option.equalsIgnoreCase("canyon")){

                 g.setColor(Color.black);

             }

             else if (option.equalsIgnoreCase("ocean")&&numbers[row+5][col+5] == 0){

                 g.setColor(Color.yellow);

             }

             else if (option.equalsIgnoreCase("ocean")){

                 g.setColor(Color.cyan);

             }

             g.fillRect(30 + col *22, 30 + row * 22, 21, 21);

             g.setFont( new Font ("Serif", Font.BOLD, 48));

             g.setColor(Color.red);

             g.drawString("TOWER DEFENCE", 10,100);

         }

     }

         }

         public void StartButton(){

          selectmap.addItem("Ocean");

          selectmap.addItem("Canyon");

          begin.setVisible(true);

          begin.addActionListener(new ButtonListener());

          this.setLayout(null);

          this.add(begin);

          begin.setBounds(0,468,500,32);
          selectmap.setVisible(true);

          this.add(selectmap);


          selectmap.setBounds(300,300, 100,25);

         }

 // Draw the numbers on the grid

 // Draw the Sudoku grid of rectangles

 public void LifeCheck(Graphics g){

   if(!inquestionstate){

         JButton upgrade = new JButton ("upgrade");

         upgrade.addActionListener(new ButtonListener());

     for (int i = 0; i<20; i++){

         for (int j = 19; j<20; j++){

             if (numbers [i+5][j+5] == 2){

                 lives--;

                 numbers[i+5][j+5] = 1;
             }

         }

     }

     if (lives <=0){

         play = false;

         end = true;

         for (int row = 0; row < 20; row ++){

         for (int col = 0; col < 20; col ++){

             if (numbers[row+5][col+5] == 0&&option.equalsIgnoreCase("Canyon")){

                 g.setColor(Color.green);

             }

             else if (numbers [row+5][col+5] == 1&&option.equalsIgnoreCase("Canyon")){

                 g.setColor(Color.black);
             }

             else if (numbers [row+5][col+5] == 2){

                 g.setColor(Color.red);

             }

             else if (numbers[row+5][col+5] == 0&&option.equalsIgnoreCase("Ocean")){

                 g.setColor(Color.yellow);

             }

             else if (numbers [row+5][col+5] == 1&&option.equalsIgnoreCase("Ocean")){

                 g.setColor(Color.cyan);

             }

             else if (numbers [row+5][col+5] == 3){

                 g.setColor(Color.gray);

             }

            g.fillRect(30 + col *22, 30 + row * 22, 21, 21);

             g.setColor(Color.black);

             g.drawString("Money: "+money, 420,480);

             g.drawString("Lives: "+lives, 360,480);

             g.drawString("Laser: "+laser, 240,480);

             System.out.print(damage[row][col]);



         }

     }

     this.setLayout(null);

     this.add(upgrade);

    upgrade.setBounds(0, 475, 100, 25);

         Font myFont = new Font ("Arial", Font.BOLD, 25);

         g.setFont(myFont);

         if (option.equalsIgnoreCase("Ocean")){

               g.setColor(Color.red);

         }

         else if (option.equalsIgnoreCase("Canyon")){

             g.setColor(Color.cyan);

         }

         g.drawString("You have lost.  You lasted for " + attackspawn + "seconds.",10,100);

     }

     }

 }

 public void SpawnAttackers(){

   if(!inquestionstate){

     int currentspawn = 0;

     attackcount++;

     attackerhealth+=3;

     if (attackerhealth % 10 == 0){

         attackerhealth += (int)(attackerhealth*1.1);

                 }

    if (attackerhealth % 17 == 0){

         attackerhealth += (int)(attackerhealth*1.2);

    }

    if (attackerhealth % 12 == 0){

         attackerhealth += (int)(attackerhealth*1.3);

    }

    if (attackerhealth % 2 == 0){

         attackerhealth += 1+(int)(attackerhealth * 1.05);

    }

     for (int i = 0; i < 20; i++){

         for (int j = 0; j< 20; j++){

             if (numbers [j+5][i+5] == 1){

                 numbers [j+5][i+5] = 2;

                 currentspawn++;

                 if (currentspawn == attackcount){

                     i = j = 100;

                 }

             }

         }

     }

     }

 }

 public void drawGrid(Graphics g) {

   if(!inquestionstate){

     money++;

     attackspawn++;

           }

     upgrade.addActionListener(new ButtonListener());

     for (int row = 0; row < 20; row ++){

         for (int col = 0; col < 20; col ++){

             if (numbers[row+5][col+5] == 0&&option.equalsIgnoreCase("Canyon")){

                 g.setColor(Color.green);

             }

             else if (numbers [row+5][col+5] == 1&&option.equalsIgnoreCase("Canyon")){

                 g.setColor(Color.black);

             }

             else if (numbers[row+5][col+5] == 0&&option.equalsIgnoreCase("Ocean")){

                 g.setColor(Color.yellow);

             }

             else if (numbers [row+5][col+5] == 1&&option.equalsIgnoreCase("Ocean")){

                 g.setColor(Color.cyan);

             }

             else if (numbers [row+5][col+5] == 2){

                 g.setColor(Color.red);

             }

             else if (numbers [row+5][col+5] == 3){

                 g.setColor(Color.gray);

             }

             g.fillRect(30 + col *22, 30 + row * 22, 21, 21);

             g.setColor(Color.black);

             g.drawString("Money: "+money, 420,480);

             g.drawString("Lives: "+lives, 360,480);

             g.drawString("Laser: "+laser, 240,480);

             g.drawString("Wave: " + (int)(attackspawn/15), 170,480);

             g.drawString("Total Damage: " + totaldamage, 170,20);

             System.out.print(damage[row][col]);

         }

         System.out.println();

     }

     this.setLayout(null);

     this.add(upgrade);

    upgrade.setBounds(0, 475, 100, 25);

     System.out.println();


 }

 public void ReadIt(){

   if(!inquestionstate){

     if (option.equalsIgnoreCase("ocean")){


         ifile = new File("oceanmap.txt");

     }

     else if (option.equalsIgnoreCase("canyon")){

         ifile = new File("map.txt");

     }

 try{

     input = new Scanner(ifile);

 }catch(FileNotFoundException e){

     System.out.println("ERROR: cannot open file map.txt");

     System.exit(1);

 }

 for (int i = 0; i<20; i++){

     for (int j = 0; j < 20; j++){

         numbers [j+5][i+5] = input.nextInt();

     }

 }

 start = false;

 play = true;

 input.close();

 }

 }//end method ReadIt

 public void DamageCheck(){

   if(!inquestionstate){

 for (int i = 0; i<20; i++){

     for (int j = 0; j<20; j++){

         if (damage[i][j] >=attackerhealth){

             numbers[i+5][j+5] = 1;

             damage[i][j] = 0;

             money+=25;

         }

     }

 }

 }

 }

 public void Attack(Graphics g){

   if(!inquestionstate){

     for (int i = 0; i<20; i++){

         for (int j = 0; j<20; j++){

             if (numbers [i+5][j+5] == 3){

                 for (int o = -3; o<4; o++){

                     for (int e = -3; e<4; e++){

                         if (numbers [i+o+5][j+e+5] == 2){

                             damage [i+o][j+e] +=laser;


                             totaldamage+=laser;
                             g.setColor(Color.white);

                             g.drawLine(40+j*22, 40+i*22, 40+(j+e)*22, 40+(i+o)*22);

                         }

                     }

                 }

             }

         }

     }

     }

 }

 public void ChangeAttackers(){

   if(!inquestionstate){

     for (int i = 0; i<20; i++){

         for (int j = 0; j<20; j++){

             moved[i][j] = false;

         }

     }

     for (int i = 0; i<20; i++){

         for (int j = 0; j<20; j++){

             if (numbers[i+5][j+5] == 2){

                 if (numbers[i+5][j+6] == 1&&moved[i][j] == false){

                     numbers [i+5][j+5] = 1;

                     numbers [i+5][j+6] = 2;

                     damage[i][j+1] = damage[i][j];

                     damage[i][j] = 0;

                     moved [i][j+1] = true;

                     System.out.println("Move Right");

                 }

                 else if ((i>13)||(i<9&&i>=7)){

                     if (numbers[i+4][j+5] == 1&&moved [i][j] == false){

                             numbers [i+5][j+5] = 1;

                             numbers [i+4][j+5] = 2;

                             moved [i-1][j] = true;

                             damage[i-1][j] = damage[i][j];

                             damage[i][j] = 0;

                             System.out.println("Move Up");

                     }

                     else if (numbers [i+6][j+5] == 1&&moved[i][j] == false){

                         numbers [i+5][j+5] = 1;

                         numbers [i+6][j+5] = 2;

                         moved [i+1][j] = true;

                         damage[i+1][j] = damage[i][j];

                         damage[i][j] = 0;

                         System.out.println("Move Down");

                     }

                 }

                 else if ((i<=13&&i>=10)||(i<7)){

                     if (numbers [i+6][j+5] == 1&&moved[i][j] == false){

                         numbers [i+5][j+5] = 1;

                         numbers [i+6][j+5] = 2;

                         moved [i+1][j] = true;

                         damage[i+1][j] = damage[i][j];

                         damage[i][j] = 0;

                         System.out.println("Move Down");

                     }

                     else if (numbers[i+4][j+5] == 1&&moved [i][j] == false){

                             numbers [i+5][j+5] = 1;

                             numbers [i+4][j+5] = 2;

                             moved [i-1][j] = true;

                             damage[i-1][j] = damage[i][j];

                             damage[i][j] = 0;

                             System.out.println("Move Up");

                     }

                 }

                 else if (j!=0){

                     if (numbers[i+5][j+4] == 1&&j!=0&&moved[i][j] == false){

                         numbers [i+5][j+5] = 1;


                         numbers [i+5][j+4] = 2;

                         moved[i][j-1] = true;

                         damage[i][j-1] = damage[i][j];

                         damage[i][j] = 0;

                         System.out.println("Move Left");

                     }

                 }

             }

         }

     }

     }

 }


 public void CheckOutputFile(){
          int number;

         try{

         output = new Scanner(ofile);

         }catch(FileNotFoundException e){

         System.out.println("ERROR: cannot open file hiscore.txt");

         fileexists = true;

        // System.exit(1);

         }

         if (fileexists){

                 hiscore = output.nextInt();

                 checkhiscore = true;

                 output.close();

                 }

         }

 public void MakeOutputFile ( ) {

   fargle = new File ("Hiscore.txt");

      try {

           makesOutput = new PrintWriter ( fargle );

   }catch ( IOException e ){

      System.out.println("Cannot create file to be written to");

      System.exit(1);

   }// end catch

      makesOutput.println("
Hiscore :	" + attackspawn);

      makesOutput.println ( );

      System.exit(1);

 }// end method MakeOutput File

   class ButtonListener implements ActionListener{

 public void actionPerformed(ActionEvent evt){

         System.out.println("RAWR");

               if (evt.getSource() == begin){

                         System.out.println("Button Pressed");

                         begin.setVisible(false);

                         selectmap.setVisible(false);

                         play = true;

                         start = true;

                         option = (String)selectmap.getSelectedItem();

                         System.out.println(option);

               }

              if (evt.getSource() == upgrade){

                  if (money>=50){

                      money+=-50;

                      laser+=1+(int)(laser*.1);

                  }

              }
  }

}

 }

 public void mousePressed(MouseEvent m){

     int x = m.getX();

     int y = m.getY();

     for (int row = 0; row < 20; row ++){

         for (int col = 0; col < 20; col ++){

             if (x>30+col*22&&x<51+col*22&&y>30+row*22&&y<51+row*22){
                 if (numbers [row+5][col+5] == 1&&money>200){

                     numbers [row+5][col+5] = 0;

                     money+=-200;

                     repaint();

                 }

                 else if (numbers [row+5][col+5] == 0&&money>50){

                     System.out.println(row+" " +col);

                     money+=-50;

                     numbers [row+5][col+5] = 3;

                     repaint();

                 }

             }

         }

     }

 }

 public void mouseClicked(MouseEvent m){}

 public void mouseReleased(MouseEvent m){}

 public void mouseEntered(MouseEvent m){}

 public void mouseExited(MouseEvent m){}

}
问题回答

不允许在客户计算机上读/打字<>File。

备选案文是:

  1. Store the information on the server.
  2. Digitally sign the applet and get the user to OK it when asked to trust it.
  3. Deploy for a Plug-In 2 JRE and use the JNLP API services to mediate the file write.




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