printing - Get console text in java -

is there way retrieve output console has been outputted by:

system.out.print("blabla"); 

?

if want able see wrote console, need write own printstream implementation wraps existing printstream, stores whatever supposed write , delegates (all methods) wrapped (original) printstream actual job. how store messages entirely depends on needs (store last written string, store map of timestamp -> string or whatever). once have this, can replace system.out own implementation (via system.setout()):

public class rememberallwrittentextprintstream extends printstream {      private static final string newline = system.getproperty("line.separator");      private final stringbuffer sb = new stringbuffer();     private final printstream original;      public rememberallwrittentextprintstream(printstream original) {         this.original = original;     }      public void print(double d) {         sb.append(d);         original.print(d);     }      public void print(string s) {         sb.append(s);         original.print(s);     }      public void println(string s) {         sb.append(s).append(newline);         original.println(s);     }      public void println() {         sb.append(newline);         original.println();     }      public void printf(string s, object... args) {         sb.append( string.format(s, args) );         original.printf(s, args);     }       // .....     // same public methods in printstream....     // (your ide should create delegates `original` methods.)      public string getallwrittentext() {         return sb.tostring();     }  } 

you may need take care of thread-safety (stringbuffer thread-safe, may need more this).

once have above, can:

rememberallwrittentextprintstream ps         = new rememberallwrittentextprintstream(system.out); system.setout(ps); system.out.print("bla"); system.out.print("bla"); ps.getallwrittentext(); // should return "blabla" 

edit: added println() implementations using platform-independent newline.