Dear Experts,
THe following class Test3 writing a HelloWorld.class file for the
following program using javassist, without
having a HelloWorld.java file.
import java.io.*;
import javassist.*;
/*
This program gnerates HelloWorld.class for the following java code
public class HelloWorld{
int abc;
public HelloWorld(){
abc=100;
}
public static void main(String a[]){
HelloWorld h=new HelloWorld();
System.out.println(h.abc);
}
}
*/
public class Test3 {
public static void main(String[] args) throws Exception {
ClassPool pool = ClassPool.getDefault();
CtClass cc = pool.makeClass(HelloWorld);
CtField sf= CtField.make(int abc;,cc);
cc.addField(sf);
String str=public HelloWorld(){abc=100;};
CtConstructor ccon=CtNewConstructor.make(str,cc);
cc.addConstructor(ccon);
CtMethod m = CtNewMethod.make(
public static void main(String a[]){ +
HelloWorld h=new HelloWorld();+
System.out.println(h.abc); +
}, cc);
cc.addMethod(m);
cc. writeFile();
}
}
==
My doubts are:
1.In the above method , we are adding fields,constructor,methods seperatley
by
CtClass cc = pool.makeClass(HelloWorld);
cc.addField(sf);
cc.addMethod(m);
2.my doubt is insted of adding each element(class,filed,constructor,method...)
seperatly
is the following is possible in javassist
String str=import java.io.*;+
public class HelloWorld{+
int abc;+
public HelloWorld(){+
abc=100;+
}+
public static void main(String a[]){+
HelloWorld h=new HelloWorld();+
System.out.println(h.abc);+
}+
};
is it possible to create a HelloWorld.class using javassist by having the above
String as a parameter
3.When we are generateing class on the fly(like in the above example),how to include
packages
Thanks in Advance
Jai Bharat Matha
G.Panneer Pandi
India
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