String productLine="1.00 REFRESCO COLA 1.20 1.20";

String amount="1.00";
String product="REFRESCO COLA";
String unitPrice="1.20";
String total="1.20"

String lineProduct="1.000' CAÑA DE CERVEZA 0.0 1.20 1.20";
String amount="1.00";
String product="CAÑA DE CERVEZA 0.0";
String unitPrice="1.20";
String total="1.20"

String[] split = productLine.split(" ");
String amount="split[0];
String product = "";
for(int i = 0: i < split.length-3; i++){
     if(i > 0 ){ //adding spaces
         product = product + " ";
     }
     product = product + split[i+1];
}
String unitPrice=split[split.length-2];
String total=split[split.length-1]