---------------------------------------

>more minmax.java
class Minmax {
  public static void main (String[] args) {
    int x,y,z;

    x=2;
    y=3;
    if (x<y)
      z=x;
    else
      z=y;
    System.out.println(z);
  }
}
>javac Minmax.java
>java Minmax
2

---------------------------------------

>java -version
java version "1.1.1"

---------------------------------------

>javac -g Minmax.java
>jdb Minmax
Initializing jdb...
Warning: Thread.suspend() was called; Navigator deadlock might result
0xde326688:class(Minmax)
> ?
** command list **
threads [threadgroup]     -- list threads
thread <thread id>        -- set default thread
suspend [thread id(s)]    -- suspend threads (default: all)
resume [thread id(s)]     -- resume threads (default: all)
where [thread id] | all   -- dump a thread's stack
threadgroups              -- list threadgroups
threadgroup <name>        -- set current threadgroup

print <id> [id(s)]        -- print object or field
dump <id> [id(s)]         -- print all object information

locals                    -- print all local variables in current stack frame

classes                   -- list currently known classes
methods <class id>        -- list a class's methods

stop in <class id>.<method> -- set a breakpoint in a method
stop at <class id>:<line> -- set a breakpoint at a line
up [n frames]             -- move up a thread's stack
down [n frames]           -- move down a thread's stack
clear <class id>:<line>   -- clear a breakpoint
step                      -- execute current line
cont                      -- continue execution from breakpoint

catch <class id>          -- break for the specified exception
ignore <class id>         -- ignore when the specified exception

list [line number|method] -- print source code
use [source file path]    -- display or change the source path

memory                    -- report memory usage
gc                        -- free unused objects

load classname            -- load Java class to be debugged
run <class> [args]        -- start execution of a loaded Java class
!!                        -- repeat last command
help (or ?)               -- list commands
exit (or quit)            -- exit debugger
> classes
** classes list **
0xde300000:class(java.lang.Thread)

  ... LUNGA LISTA...

0xde326d30:class(netscape.debug.Debugger)
0xde326688:class(Minmax)
> stop at Minmax:5
Breakpoint set at Minmax:5
> stop at Minmax:6
Breakpoint set at Minmax:6
> stop at Minmax:7
Breakpoint set at Minmax:7
> stop at Minmax:8
Breakpoint set at Minmax:8
> load Minmax
0xde326688:class(Minmax)
> run Minmax
Warning: Thread.suspend() was called; Navigator deadlock might resultrunning
...
main[1]
Warning: Thread.suspend() was called; Navigator deadlock might result
Warning: Thread.suspend() was called; Navigator deadlock might result
Warning: Thread.suspend() was called; Navigator deadlock might result

Breakpoint hit: Minmax.main (Minmax:5)
main[1] list
1          class Minmax {
2            public static void main (String[] args) {
3              int x,y,z;
4
5       =>     x=2;
6              y=3;
7              if (x<y)
8                z=x;
9              else
main[1] step
main[1] Warning: Thread.suspend() was called; Navigator deadlock might result
Warning: Thread.suspend() was called; Navigator deadlock might result
Warning: Thread.suspend() was called; Navigator deadlock might result
Warning: Thread.suspend() was called; Navigator deadlock might result

Breakpoint hit: Minmax.main (Minmax:6)
main[1] list
2            public static void main (String[] args) {
3              int x,y,z;
4
5              x=2;
6       =>     y=3;
7              if (x<y)
8                z=x;
9              else
10               z=y;
main[1] locals
Method arguments:
  args =
Local variables:
  x = 2
  y is not in scope.
  z is not in scope.
  z is not in scope.
main[1] step
main[1] Warning: Thread.suspend() was called; Navigator deadlock might result
Warning: Thread.suspend() was called; Navigator deadlock might result
Warning: Thread.suspend() was called; Navigator deadlock might result
Warning: Thread.suspend() was called; Navigator deadlock might result

Breakpoint hit: Minmax.main (Minmax:6)
main[1] step
main[1] Warning: Thread.suspend() was called; Navigator deadlock might result
Warning: Thread.suspend() was called; Navigator deadlock might result
Warning: Thread.suspend() was called; Navigator deadlock might result
Warning: Thread.suspend() was called; Navigator deadlock might result

Breakpoint hit: Minmax.main (Minmax:7)
main[1] list
3              int x,y,z;
4
5              x=2;
6              y=3;
7       =>     if (x<y)
8                z=x;
9              else
10               z=y;
11             System.out.println(z);
main[1] locals
Method arguments:
  args =
Local variables:
  x = 2
  y = 3
  z is not in scope.
  z is not in scope.
main[1] step
main[1] Warning: Thread.suspend() was called; Navigator deadlock might result
Warning: Thread.suspend() was called; Navigator deadlock might result
Warning: Thread.suspend() was called; Navigator deadlock might result
Warning: Thread.suspend() was called; Navigator deadlock might result

Breakpoint hit: Minmax.main (Minmax:7)
main[1] step
main[1] Warning: Thread.suspend() was called; Navigator deadlock might result
Warning: Thread.suspend() was called; Navigator deadlock might result
Warning: Thread.suspend() was called; Navigator deadlock might result
Warning: Thread.suspend() was called; Navigator deadlock might result

Breakpoint hit: Minmax.main (Minmax:8)
main[1] step
main[1] Warning: Thread.suspend() was called; Navigator deadlock might result
Warning: Thread.suspend() was called; Navigator deadlock might result
Warning: Thread.suspend() was called; Navigator deadlock might result
Warning: Thread.suspend() was called; Navigator deadlock might result

Breakpoint hit: Minmax.main (Minmax:8)
main[1] step
main[1] Warning: Thread.suspend() was called; Navigator deadlock might result
Warning: Thread.suspend() was called; Navigator deadlock might result
Warning: Thread.suspend() was called; Navigator deadlock might result
Warning: Thread.suspend() was called; Navigator deadlock might result

Breakpoint hit: Minmax.main (Minmax:11)
main[1] list
7              if (x<y)
8                z=x;
9              else
10               z=y;
11      =>     System.out.println(z);
12           }
13         }
main[1] locals
Method arguments:
  args =
Local variables:
  x = 2
  y = 3
  z is not in scope.
  z = 2
main[1] step
main[1] Warning: Thread.suspend() was called; Navigator deadlock might result
Warning: Thread.suspend() was called; Navigator deadlock might result
Warning: Thread.suspend() was called; Navigator deadlock might result
Warning: Thread.suspend() was called; Navigator deadlock might result

Breakpoint hit: Minmax.main (Minmax:11)
main[1] cont
2main[1]
exit

---------------------------------------

>more Minmax.java
class Minmax {
  public static void main (String[] args) {
    int x, y, z;

    x = 2;
    y = 3;
    if (x < y)
      z = x;
    else
      z = y;
    System.out.println(z);
  }
}
>javap -c Minmax
Compiled from Minmax.java
synchronized class Minmax extends java.lang.Object
    /* ACC_SUPER bit set */
{
    public static void main(java.lang.String[]);
    Minmax();
}

Method void main(java.lang.String[])
   0 iconst_2
   1 istore_1
   2 iconst_3
   3 istore_2
   4 iload_1
   5 iload_2
   6 if_icmpge 14
   9 iload_1
  10 istore_3
  11 goto 16
  14 iload_2
  15 istore_3
  16 getstatic #6 <Field java.io.PrintStream out>
  19 iload_3
  20 invokevirtual #7 <Method void println(int)>
  23 return

Method Minmax()
   0 aload_0
   1 invokespecial #5 <Method java.lang.Object()>
   4 return

---------------------------------------

>more Numeri.java
class Numeri {
  public static void main (String[] args) {
    int i,N=10;

    for (i = 1; i <= N; i++)
      System.out.println(i);
  }
}
>javap -c Numeri
Compiled from Numeri.java
synchronized class Numeri extends java.lang.Object
    /* ACC_SUPER bit set */
{
    public static void main(java.lang.String[]);
    Numeri();
}

Method void main(java.lang.String[])
   0 bipush 10
   2 istore_2
   3 iconst_1
   4 istore_1
   5 goto 18
   8 getstatic #6 <Field java.io.PrintStream out>
  11 iload_1
  12 invokevirtual #7 <Method void println(int)>
  15 iinc 1 1
  18 iload_1
  19 iload_2
  20 if_icmple 8
  23 return

Method Numeri()
   0 aload_0
   1 invokespecial #5 <Method java.lang.Object()>
   4 return