Databases
StackOverflow2013
Postsdbo
POWhy isn't my if statement in my java game working?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POWhy isn't my if statement in my java game working?
    primarykey
    data
    text
    <p>I am creating a modern version of breakout for PC in Java 7, but I have ran into a major problem that I can't seem to fix.</p> <p>Why won't my <code>if</code> statement execute in this, even if the spacebar is pressed , lives IS greater than 0, and the y coord of the ball is greater than 600?</p> <p>I already tested this with a lot of print statements and log files, but nothing seems to work.</p> <pre><code> import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JOptionPane; import java.awt.*; //import java.awt.event.KeyAdapter; import java.awt.event.KeyEvent; import java.awt.event.KeyListener; public class Game extends JFrame implements Runnable , KeyListener { private static final long serialVersionUID = 1L; private Graphics dbg; private Image dbi; int level = 0; int lives = 6; int powerup = 0; int blocksGone = 0; int vy = 0; int vx = 0; int by = 640; int bx = 0; int[] powerups = new int[8]; ImageIcon i0 = new ImageIcon("paddle.gif"); ImageIcon i1 = new ImageIcon("sidebar.gif"); ImageIcon i2 = new ImageIcon("laserpaddle.gif"); ImageIcon i3 = new ImageIcon("paddleCannon.gif"); ImageIcon i4 = new ImageIcon("laser.gif"); ImageIcon i5 = new ImageIcon("bullet.gif"); ImageIcon i6 = new ImageIcon("lifeIcon.gif"); ImageIcon i7 = new ImageIcon("ball.png"); ImageIcon i8 = new ImageIcon("bomb.png"); ImageIcon i9 = new ImageIcon("atomic.png"); //ImageIcon i10 = new ImageIcon("bullet.gif"); Image paddle; Image side; Image bullet; Image bomb; Image ball; Image atomc; Image life; Image dead; int paddlex = 400; int pdx = 0; public Game() { // TODO Auto-generated constructor stub setVisible(true); setDefaultCloseOperation(DO_NOTHING_ON_CLOSE); setTitle("Breakout Smash"); setSize(1024,560); setResizable(false); this.addKeyListener(this); } @Override public void run() { // TODO Auto-generated method stub try { init(); while (true) { move(); Thread.sleep(5); } } catch (Exception e) { System.out.println ("java.lang.Execption in line 25, class Game. Stacktrace:"); e.printStackTrace(); } } // TODO Auto-generated method stub private void init() { // TODO Auto-generated method stub paddle = i0.getImage(); side = i1.getImage(); ball = i7.getImage(); } public void paint (Graphics g) { dbi = createImage (getWidth(),getHeight()); dbg = dbi.getGraphics(); paintComponent(dbg); g.drawImage(dbi , 0 , 0 , this); } public void paintComponent(Graphics g) { // TODO Auto-generated method stub super.paint(g); g.setColor(Color.DARK_GRAY); g.fillRect(0,0,getWidth(),getHeight()); g.drawImage(side, this.getWidth() - side.getWidth(null), 0, null); g.setColor(Color.CYAN); g.drawString("Score", 950, 50); g.drawString("Lives: " + lives , 880, 50); g.drawImage(paddle, paddlex, 520, null); g.drawImage(ball, bx, by, null); repaint(); } public void move () { //if (by &lt;= getHeight()) { if (paddlex &gt; 0 &amp;&amp; paddlex &lt; getWidth() - side.getWidth(null) - 50) { paddlex += pdx; } if (paddlex &gt;= getWidth() - side.getWidth(null) - 50) { paddlex-= 2; } if (paddlex &lt;= 0) { paddlex++; } if (bx &gt; 0 &amp;&amp; bx &lt; getWidth() - side.getWidth(null) &amp;&amp; by &gt; 10 &amp;&amp; by &lt; getHeight()) { bx += vx; by -= vy; } if (by &gt; 560) { by = 575; bx = 0; } if (bx &lt; 5) { bx += 3; vx = vx * -1; } if (bx &gt; getWidth() - side.getWidth(null) - 5) { bx -= 3; vx = vx * -1; } if (by &lt; 15) { by++; vy = vy * -1; } if (by &gt;= 515 &amp;&amp; by &lt;= 515 + paddle.getHeight(null) &amp;&amp; bx + 8 &gt; paddlex &amp;&amp; bx + 8 &lt; paddlex + paddle.getWidth(null)) { vy = vy * -1; vy ++; vx *= pdx; /*if (pdx == -2) { vx = vx * -2; } if (pdx == 2) { vx = vx * 2; }*/ } //} else { //vy = 0; //vx = 0; //} } @Override public void keyTyped(KeyEvent e) { // TODO Auto-generated method stub } @Override public void keyPressed(KeyEvent e) { // TODO Auto-generated method stub int keyCode = e.getKeyCode(); if (keyCode == KeyEvent.VK_ESCAPE) { int quit = JOptionPane.showConfirmDialog(null, "Are you sure you want to quit?", "Quit?", JOptionPane.YES_NO_OPTION); if (quit == 0) System.exit(0); } else if (keyCode == KeyEvent.VK_LEFT) { pdx = -2; } else if (keyCode == KeyEvent.VK_RIGHT) { pdx = 2; } } @Override public void keyReleased(KeyEvent e) { // TODO Auto-generated method stub int keyCode = e.getKeyCode(); if (keyCode == KeyEvent.VK_LEFT) { pdx = 0; } else if (keyCode == KeyEvent.VK_RIGHT) { pdx = 0; } else if (keyCode == KeyEvent.VK_SPACE) { //if (by &gt; 600 &amp;&amp; lives &gt;= 0) { // this is my problem here lives--; vy = 1; vx = pdx; bx = paddlex + 10; by = 500; System.out.println ("Space hit!"); /*if (lives == 0) { JOptionPane.showMessageDialog(null, "Game Over!" , "!", JOptionPane.WARNING_MESSAGE); } } */ } } } </code></pre> <p>There must be something I'm not seeing in my code. The big question is: Why won't the ball respawn on the spacebar press and subtract one life at the same time?</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USGalen Nare
    1. USGalen Nare
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COYou can add some debug info to understand which part of the if statement is wrong.
      singulars
      1. POWhy isn't my if statement in my java game working?
      1. USBobTheBuilder
    2. COI once had to use keyChar instead of keyCode. Maybe that's your issue.
      singulars
      1. POWhy isn't my if statement in my java game working?
      1. This table or related slice is empty.
    3. COWelcome to Stack Overflow! Asking people to spot errors in your code is not especially productive. You should use the debugger (or add print statements) to isolate the problem, by tracing the progress of your program, and comparing it to what you expect to happen. As soon as the two diverge, then you've found your problem. (And then if necessary, you should construct a [minimal test-case](http://sscce.org).)
      singulars
      1. POWhy isn't my if statement in my java game working?
      1. USOliver Charlesworth
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload