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
