Can I precompile the format string in String.format?

It is well known that String.format() performance is terrible. I see big possible improvements in my (and probably very common) typical case. I print same structure of data many times. Let imagine the structure like "x:%d y:%d z:%d". I expect that the main trouble with String.format() is that it has to always parse formatting string. My question is: Is there some ready made class which would allow to read formatting string only once and then allow to quickly give string when variable parameters filled?? Usage shall look like this:

PreString ps = new PreString("x:%d y:%d z:%d");
String s;
for(int i=0;i<1000;i++){
    s = ps.format(i,i,i); 
}

I know it is possible - following is my quick & dirty example which do what I'm talking about and is about ~10 times faster at my machine:

public interface myPrintable{
    boolean isConst();
    String prn(Object o);
    String prn();
}

public class MyPrnStr implements myPrintable{
    String s;
    public MyPrnStr(String s){this.s =s;}
    @Override public boolean isConst() { return true; }
    @Override public String prn(Object o) { return s; }
    @Override public String prn() { return s; }
}

public class MyPrnInt implements myPrintable{
    public MyPrnInt(){}
    @Override  public boolean isConst() { return false; }
    @Override  public String prn(Object o) { return String.valueOf((Integer)o);  }
    @Override  public String prn() { return "NumMissing";   }
}

public class FastFormat{
    myPrintable[]      obj    = new myPrintable[100];
    int                objIdx = 0;
    StringBuilder      sb     = new StringBuilder();

    public FastFormat() {}

    public void addObject(myPrintable o) {  obj[objIdx++] = o;   }

    public String format(Object... par) {
        sb.setLength(0);
        int parIdx = 0;
        for (int i = 0; i < objIdx; i++) {
            if(obj[i].isConst()) sb.append(obj[i].prn());
            else                 sb.append(obj[i].prn(par[parIdx++]));
        }
        return sb.toString();
    }
}

It is used like this:

FastFormat ff = new FastFormat();
ff.addObject(new MyPrnStr("x:"));
ff.addObject(new MyPrnInt());
ff.addObject(new MyPrnStr(" y:"));
ff.addObject(new MyPrnInt());
ff.addObject(new MyPrnStr(" z:"));
ff.addObject(new MyPrnInt());
for (int i = 0; i < rpt; i++) {
    s = ff.format(i,i,i);
}

when I compare with

long beg = System.nanoTime();
for (int i = 0; i < rpt; i++) {
    s = String.format("x:%d y:%d z:%d", i, i, i);
}
long diff = System.nanoTime() - beg;

I get better times by factor of ~10:

time [ns]: String.format()     (+90,73%)  3 458 270 585 
time [ns]: FastFormat.format() (+09,27%)    353 431 686