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Код


Java Plug-in 1.6.0_31
Using JRE version 1.6.0_31-b05 Java HotSpot(tm) Client VM
User home directory = C:\Users\123
----------------------------------------------------
c:   clear console window
f:   finalize objects on finalization queue
g:   garbage collect
h:   display this help message
l:   dump classloader list
m:   print memory usage
o:   trigger logging
q:   hide console
r:   reload policy configuration
s:   dump system and deployment properties
t:   dump thread list
v:   dump thread stack
x:   clear classloader cache
0-5: set trace level to <n>
----------------------------------------------------


java.lang.UnsupportedClassVersionError: chapt11/ReadParam : Unsupported major.minor version 51.0
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClassCond(Unknown Source)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at java.security.SecureClassLoader.defineClass(Unknown Source)
    at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
    at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
    at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Exception: java.lang.UnsupportedClassVersionError: chapt11/ReadParam : Unsupported major.minor version 51.0

Код


package chapt11;

import java.applet.Applet;
import java.awt.Color;
import java.awt.Graphics;
/**
*
* @author 123
*/
public class ReadParam extends Applet {
private int bNum;
private boolean state;

public void paint(Graphics g) {
double d = 0;
if (state) d = Math.pow(bNum, 2);
else g.drawString("Error Parameter", 0, 11);
g.drawString("Statement: " + state, 0, 28);
g.drawString("Value b: " + bNum, 0, 45);
g.drawString("b power 2: " + d, 0, 62);
} 

public void init() {
String param;
param = getParameter("state");
if(param != null)
state = new Boolean(param);
try {
param = getParameter("bNumber");
if(param != null) 
bNum = Integer.parseInt(param);
} catch(NumberFormatException e) {
bNum = 0;
state = false;
}
}

}

Код


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</HEAD>
<BODY>
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<P>
<APPLET codebase="classes" code="chapt11/ReadParam.class" width=350 height=200>
<param name = "bNumber" value = "4">
<param name = "state" value = "true">
</APPLET>
</P>

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</BODY>
</HTML>