java - ASM to search for a String in .class file -

hi want search particular string in /java/lang/string.class file using asm. got know following method that

         @override        public string readutf8(int index, char[] buf) { string value = super.readutf8(index, buf); constantpoolstrings.add(value); return value;       } 

but not sure how use .i posting code, can please tell me how can achived in this.

public class democlassreader { public static void main(string[] args) throws ioexception { classvisitor v= new classvisitor(opcodes.asm4) {             @override  public void visit(int version, int access, string name,                               string signature, string supername, string[] interfaces) {  system.out.println(" class: "+name); super.visit(version, access, name, signature, supername, interfaces);             }                     } ;  inputstream in=string.class.getresourceasstream("/java/lang/string.class"); classreader classreader=new classreader(in); classreader.accept(v, 0);     } 

for capturing string literals can implement following methodvisitor:

classreader classreader = new classreader(in); classreader.accept(new classvisitor(opcodes.v1_7) {   public visitmethod(int access, string name, string desc,         string signature, string[] exceptions) {     return new methodvisitor(opcodes.v1_7) {       public void visitldcinsn(object cst) {         if(cst instanceof string) {            // capture string         }       }     };   } }, 0); 

see visitldcinsn(..) in javadoc.