在Java中删除字符串中的重复行
我的字符串是:
"EEE
EEE
AAA
BBB
CCC
BBB
DDD
CCC"
但是我需要在这个字符串中去掉相同的行。 如下所示:
"EEE
AAA
BBB
CCC
DDD"
我该怎么做?
解决方案
考虑到您的字符串存储在String s
中,
String[] tokens = s.split("
");
StringBuilder resultBuilder = new StringBuilder();
Set<String> alreadyPresent = new HashSet<String>();
boolean first = true;
for(String token : tokens) {
if(!alreadyPresent.contains(token)) {
if(first) first = false;
else resultBuilder.append("
");
if(!alreadyPresent.contains(token))
resultBuilder.append(token);
}
alreadyPresent.add(token);
}
String result = resultBuilder.toString();
或:
Set<String> tokens = new HashSet<String>(Arrays.asList(s.split("
")));
StringBuilder resultBuilder = new StringBuilder();
boolean first = true;
for(String token : tokens) {
if(first) first = false;
else resultBuilder.append("
")
resultBuilder.append(token);
}
String result = resultBuilder.toString();
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