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<html><head><title>Display page for Counter5 at www.BruceEckel.com</title></head><FONT FACE="Verdana,Tahoma,Arial,Helvetica,Sans"><H2>Counter5.java</H2><hr></FONT>
<OBJECT classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
    width="450" height="600" align="baseline"
    codebase="http://java.sun.com/products/plugin/1.2.2/jinstall-1_2_2-win.cab#Version=1,2,2,0">
<PARAM NAME="code" VALUE="Counter5.class">
<PARAM NAME="codebase" VALUE=".">
<PARAM NAME="type" VALUE="application/x-java-applet;version=1.2.2">
<COMMENT>
    <EMBED type="application/x-java-applet;version=1.2.2" 
       width="450" height="600" align="baseline" 
       code="Counter5.class" 
       codebase="."
       pluginspage="http://java.sun.com/products/plugin/1.2/plugin-install.html">
    <NOEMBED>
    </COMMENT>
       No Java 2 support for APPLET!!
    </NOEMBED></EMBED>
</OBJECT>
<FONT SIZE="+3"><PRE><B>
//: c14:Counter5.java
// From 'Thinking in Java, 2nd ed.' by Bruce Eckel
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
// Adjusting the priorities of threads.
// &lt;applet code=Counter5 width=450 height=600&gt;
// &lt;/applet&gt;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import com.bruceeckel.swing.*;

class Ticker2 extends Thread {
  private JButton
    b = new JButton("Toggle"),
    incPriority = new JButton("up"),
    decPriority = new JButton("down");
  private JTextField
    t = new JTextField(10),
    pr = new JTextField(3); // Display priority
  private int count = 0;
  private boolean runFlag = true;
  public Ticker2(Container c) {
    b.addActionListener(new ToggleL());
    incPriority.addActionListener(new UpL());
    decPriority.addActionListener(new DownL());
    JPanel p = new JPanel();
    p.add(t);
    p.add(pr);
    p.add(b);
    p.add(incPriority);
    p.add(decPriority);
    c.add(p);
  }
  class ToggleL implements ActionListener {
    public void actionPerformed(ActionEvent e) {
      runFlag = !runFlag;
    }
  }
  class UpL implements ActionListener {
    public void actionPerformed(ActionEvent e) {
      int newPriority = getPriority() + 1;
      if(newPriority &gt; Thread.MAX_PRIORITY)
        newPriority = Thread.MAX_PRIORITY;
      setPriority(newPriority);
    }
  }
  class DownL implements ActionListener {
    public void actionPerformed(ActionEvent e) {
      int newPriority = getPriority() - 1;
      if(newPriority &lt; Thread.MIN_PRIORITY)
        newPriority = Thread.MIN_PRIORITY;
      setPriority(newPriority);
    }
  }
  public void run() {
    while (true) {
      if(runFlag) {
        t.setText(Integer.toString(count++));
        pr.setText(
          Integer.toString(getPriority()));
      }
      yield();
    }
  }
}

public class Counter5 extends JApplet {
  private JButton
    start = new JButton("Start"),
    upMax = new JButton("Inc Max Priority"),
    downMax = new JButton("Dec Max Priority");
  private boolean started = false;
  private static final int SIZE = 10;
  private Ticker2[] s = new Ticker2[SIZE];
  private JTextField mp = new JTextField(3);
  public void init() {
    Container cp = getContentPane();
    cp.setLayout(new FlowLayout());
    for(int i = 0; i &lt; s.length; i++)
      s[i] = new Ticker2(cp);
    cp.add(new JLabel(
      "MAX_PRIORITY = " + Thread.MAX_PRIORITY));
    cp.add(new JLabel("MIN_PRIORITY = "
      + Thread.MIN_PRIORITY));
    cp.add(new JLabel("Group Max Priority = "));
    cp.add(mp);
    cp.add(start);
    cp.add(upMax);
    cp.add(downMax);
    start.addActionListener(new StartL());
    upMax.addActionListener(new UpMaxL());
    downMax.addActionListener(new DownMaxL());
    showMaxPriority();
    // Recursively display parent thread groups:
    ThreadGroup parent =
      s[0].getThreadGroup().getParent();
    while(parent != null) {
      cp.add(new Label(
        "Parent threadgroup max priority = "
        + parent.getMaxPriority()));
      parent = parent.getParent();
    }
  }
  public void showMaxPriority() {
    mp.setText(Integer.toString(
      s[0].getThreadGroup().getMaxPriority()));
  }
  class StartL implements ActionListener {
    public void actionPerformed(ActionEvent e) {
      if(!started) {
        started = true;
        for(int i = 0; i &lt; s.length; i++)
          s[i].start();
      }
    }
  }
  class UpMaxL implements ActionListener {
    public void actionPerformed(ActionEvent e) {
      int maxp =
        s[0].getThreadGroup().getMaxPriority();
      if(++maxp &gt; Thread.MAX_PRIORITY)
        maxp = Thread.MAX_PRIORITY;
      s[0].getThreadGroup().setMaxPriority(maxp);
      showMaxPriority();
    }
  }
  class DownMaxL implements ActionListener {
    public void actionPerformed(ActionEvent e) {
      int maxp =
        s[0].getThreadGroup().getMaxPriority();
      if(--maxp &lt; Thread.MIN_PRIORITY)
        maxp = Thread.MIN_PRIORITY;
      s[0].getThreadGroup().setMaxPriority(maxp);
      showMaxPriority();
    }
  }
  public static void main(String[] args) {
    Console.run(new Counter5(), 450, 600);
  }
} ///:~
</B></PRE></FONT></body></html>
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