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; --- Copyright Jonathan Meyer 1996. All rights reserved. -----------------
; File: jasmin/examples/Catch.j
; Author: Jonathan Meyer, 10 July 1996
; Purpose: Catching and throwing exceptions
; -------------------------------------------------------------------------
;
; This hows how to throw and catch Exceptions in Jasmin
;
.class public examples/Catch
.super java/lang/Object
; standard initializer
.method public <init>()V
aload_0
invokenonvirtual java/lang/Object.<init>()V
return
.end method
.method public static main([Ljava/lang/String;)V
.limit locals 3
.limit stack 5
; set up a handler to catch subclasses of java.lang.Exception
.catch java/lang/Exception from Label1 to Label2 using Handler
; store System.out in local variable 1
getstatic java/lang/System/out Ljava/io/PrintStream;
astore_1
; print out a message
aload_1
ldc " -- Before exception"
invokevirtual java/io/PrintStream/println(Ljava/lang/String;)V
; construct an instance of Exception, initialize it with a string,
; throw it. This is like the Java statement :
;
; throw new Exception("My exception");
;
Label1:
new java/lang/Exception
dup
ldc "<my exception>"
invokenonvirtual java/lang/Exception/<init>(Ljava/lang/String;)V
athrow
Label2:
aload_1
ldc " -- After exception"
invokevirtual java/io/PrintStream/println(Ljava/lang/String;)V
return
; This is the handler for the exception
Handler:
; store the exception in local variable 2
astore_2
; print out a message
aload_1
ldc " -- Caught exception: "
invokevirtual java/io/PrintStream/print(Ljava/lang/String;)V
; call getMessage() to retrieve the message from the Exception...
aload_1
aload_2
invokevirtual java/lang/Throwable/getMessage()Ljava/lang/String;
; ... now print it
invokevirtual java/io/PrintStream/println(Ljava/lang/String;)V
; return to the code
goto Label2
.end method
|
