01-guava Joiner和Splitter

Joiner

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List<String> list = Lists.newArrayList("a", "b", "c", "d", "e");

String joinStr = Joiner.on("||").skipNulls().join(list);

//joinStr:a||b||c||d||e
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Map<String, String> testMap = Maps.newLinkedHashMap();
testMap.put("广东", "粤语");
testMap.put("广西", "壮语");
testMap.put("北京", "普通话");
testMap.put("四川", "四川话");
String returnStr = Joiner.on("#").withKeyValueSeparator("=").join(testMap);
 //returnStr:广东=粤语#广西=壮语#北京=普通话#四川=四川话

Splitter

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Splitter splitter = Splitter.on('|');
Iterable<String> parts = splitter.split("1 |2|3|||");
parts.forEach(d -> System.out.println(d + "=="));

//Iterable<String> parts = splitter.split("1 |2|3|||");
1 ==
2==
3==
==
==
==

//Iterable<String> parts = splitter.trimResults().split("1 |2|3|||");
1==
2==
3==
==
==
==

//Iterable<String> parts = splitter.omitEmptyStrings().split("1 |2|3|||");
1 ==
2==
3==

//Iterable<String> parts = splitter.omitEmptyStrings().trimResults().split("1 |2|3|||");
1==
2==
3==
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String startString = "广东=粤语#广西=壮语#北京=普通话#四川=四川话";
Map<String,String> testMap = Maps.newLinkedHashMap();
testMap.put("广东","粤语");
testMap.put("广西","壮语");
testMap.put("北京","普通话");
testMap.put("四川","四川话");
Splitter.MapSplitter mapSplitter =
        Splitter.on("#").withKeyValueSeparator("=");
Map<String,String> splitMap =
        mapSplitter.split(startString);
System.out.println("splitMap:" + splitMap);
assertThat(testMap, is(splitMap));

来源：Getting Started with Google Guava