Help with AbstractStringBuilder

[javabeginner001]

Hi, everybody

I wrote a little programme but have faced a strange error I don't know how to solve it. When I try to compile my code a strange error appears look...

"Loo.java": Error #: 311 : class java.lang.AbstractStringBuilder is not public, therefore method append(java.lang.CharSequence) cannot be accessed from outside package at line 562, column 89

I know it is all about the AbstractStringBuilder is not public but haven't got a clue how can I still use its append() method :( I need it. Or if there is a way around the append() method to replace it with some... could you advice me the best way plz.

The code which make the error is

(new StringBuilder()).append(System.getProperty("user.Loo")).append(File.separator).append(".loo").toString();

Thanks

[mtyoung]

(new StringBuilder()).append(System.getProperty("user.Loo")).append(File.separator).append(".loo").toString();

i cannot find any error...
can you give more detail?

[javabeginner001]

Actually. there shouldn't be any error. It is all because I try to use a lib class out the lib. But if I take the class out the lib it is always the error about append() method appears. I don't know what to do??? Maybe there is a way I can adapt java.lang.AbstractStringBuilder to make it useful out the lib jar file?
The class I want to take out the lib is KeyTool. class

My major question is how can I use classes if I take them out a lib?

[Fubarable]

what the heck do you mean, "take them out of a lib"???

[javabeginner001]

Because the error as

"Loo.java": Error #: 311 : class java.lang.AbstractStringBuilder is not public, therefore method append(java.lang.CharSequence) cannot be accessed from outside package at line 562, column 89

is always appear if I want to compile a java file which is out a lib :(
This append() method is always throws the error. How can I sovle it. Maybe there is a good replacement of the append() method or it is worth to make adaptation???

[javabeginner001]

I mean a free source src lib JAR files. The src which is comes with the compiled one :)

[mtyoung]

you can only use AbstractStringBuilder within java.lang package...
that means... your Class should place in java.lang package

i wonder why you do not use StringBuilder?

[javabeginner001]

I know the rule :) But is there any way I can use it in my project in my packages structure?
Or if it is impossible as you saying show me what can I do to take out the KeyTool.java with no error with?

[javabeginner001]

I have no idea how should I adapt the KeyTool.java to use it out the lib :(
Actually that is the question...

[javabeginner001]

The comment above says that

This code is free software; you can redistribute it and/or modify it
0006: * under the terms of the GNU General Public License version 2 only, as
0007: * published by the Free Software Foundation.

But I don't know how can I modify it and use it if there is always the java.lang.*; lib problem :(

[javabeginner001]

i wonder why you do not use StringBuilder?

That wasn't my choice the KeyTool.java uses the AbstractStringBuilder.
Please advise me how can I use something else instead of the AbstractStringBuilder but that something should work the same.

[javabeginner001]

here is the code... It's OK for it is free source... watch the attachment zip

[mtyoung]

the code fail to complie...

[javabeginner001]

the code fail to complie...

I know that :(

That's why I ask help. Is there any idea how to make it compile? The mini instruction says that the code can be used and modified but how? What should me do to succeed it's lib outer usage :)

[javabeginner001]

what if I use, as mtyoung says, StringBuilder instead of AbstractStringBuilder?
The question is how can I modify the code to avoid the range of errors?
Any ideas?

[manishranjan.jha]

i do have the similar problem of not recognizing the AbstractStringBuilder class

my code

StringBuffer sb = new StringBuffer();
sb.append("xx");

I am using java 1.4
the append() method returns AbstractStringBuilder and this is not recognized at run time
the error comes as this....

[java.lang.StringBuffer: method append(Ljava/lang/String;)Ljava/lang/AbstractStringBuilder; not found]: java.lang.NoSuchMethodError: java.lang.StringBuffer: method append(Ljava/lang/String;)Ljava/lang/AbstractStringBuilder; not found

[JosAH]

i do have the similar problem of not recognizing the AbstractStringBuilder class

my code

StringBuffer sb = new StringBuffer();
sb.append("xx");

I am using java 1.4
the append() method returns AbstractStringBuilder and this is not recognized at run time
the error comes as this....

[java.lang.StringBuffer: method append(Ljava/lang/String;)Ljava/lang/AbstractStringBuilder; not found]: java.lang.NoSuchMethodError: java.lang.StringBuffer: method append(Ljava/lang/String;)Ljava/lang/AbstractStringBuilder; not found

The StringBuilder class didn't exist until Java 1.5. The StringBuffer class has always been with us. Don't fiddle with the AbstractStringBuilder class, it is not part of the published API.

kind regards,

Jos

[Tolls]

What odd version of Java are you uising?
Fromt he 1.4 docs, append(String) is a valid method of String Buffer.

Moreover it has nothing at all to do with AbstractStringBuilder.

[JosAH]

What odd version of Java are you uising?
Fromt he 1.4 docs, append(String) is a valid method of String Buffer.

Moreover it has nothing at all to do with AbstractStringBuilder.

S/he wasn't talking about a StringBuffer (and old class), but about a StringBuilder (only saw the light at Java 1.5).

kind regards,

Jos

[Tolls]

StringBuffer sb = new StringBuffer();
sb.append("xx");

...