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import java.util.Comparator;
import java.util.Scanner;
import java.util.TreeSet;
public class Test5 {
public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
System.out.println("请输入一个字符串:");
String line=sc.nextLine();
char[] arr=line.toCharArray();
TreeSet<Character> ts=new TreeSet<>(new Comparator<Character>() {
@Override
public int compare(Character s1, Character s2) {
int num=s1.compareTo(s2);
return num==0?1:num;
}
});
for (char c : arr) {
ts.add(c);//自动装箱
}
for(Character c:ts) {
System.out.print(c);
}
}
}