集合数据经过处理后,有时候会留下[ ]这种符号,我么需要处理掉,怎么办呢? |
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import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.function.Function;
import java.util.stream.Collectors;
@SuppressWarnings("all")
public class test69 {
public static void main(String[] args) {
List<String> list = new ArrayList<>();
list.add("ok");
list.add("ok");
list.add("无情");
list.add("无情");
list.add("oi");
list.add("???");
Map<String, Long> countMap = list.stream().collect(Collectors.groupingBy(Function.identity(), Collectors.counting()));
List<String> flag = countMap.keySet().stream().filter(key -> countMap.get(key) > 1).distinct().collect(Collectors.toList());
System.out.println("没有去掉括号前: "+flag);
System.out.println("去掉括号后: "+flag.toString().replaceAll("\\[|\\]", ""));
}
}
没有去掉括号前: [无情, ok]
去掉括号后: 无情, ok
Process finished with exit code 0