1 public String buildString(List<String> stringList, String delimiter){
 2         StringBuilder builder = new StringBuilder();
 3         for (String s : stringList) {
 4              if(s != null){
 5                   builder.append(s).append(delimiter);
 6             }
 7         }
 8         builder.setLength(builder.length() – delimiter.length());
 9         return builder.toString();
10 }

Joiner.on("|").skipNulls().join(stringList); // 默认使用“|”作为分隔符

Joiner.on("|").useForNull("no value").join(stringList);

 Joiner stringJoiner = Joiner.on("|").skipNulls();//the useForNull() method returns a new instance of the Joiner!stringJoiner.useForNull("missing");stringJoiner.join("foo","bar",null);

StringBuilder stringBuilder = new StringBuilder();
Joiner joiner = Joiner.on("|").skipNulls();
//returns the StringBuilder instance with the values foo,bar,baz appeneded with "|" delimiters
joiner.appendTo(stringBuilder,"foo","bar","baz");

FileWriter fileWriter = new FileWriter(new File("path")):
List<Date> dateList = getDates();
Joiner joiner = Joiner.on("#").useForNulls(" ");
//returns the FileWriter instance with the values appended into it
joiner.appendTo(fileWriter,dateList);

mapJoiner = Joiner.on("#").withKeyValueSeparator("=");

Map<String, String> testMap = Maps.newLinkedHashMap();testMap.put("Washington D.C", "Redskins");testMap.put("New York City", "Giants");testMap.put("Philadelphia", "Eagles");testMap.put("Dallas", "Cowboys");String returnedString = Joiner.on("#").withKeyValueSeparator("=").join(testMap);System.out.println(returnedString);