import java.util.*;
public class Main
{
public static String deleteBlank(String str){
char[] array = str.toCharArray();
int start = 0,end = array.length-1;
while(array[start]==' ')start++;
while(array[end]==' ')end--;
return new String(array,start,end-start);
}
public static void main(String[] args)
{
Scanner cin = new Scanner(System.in);
System.out.println("请输入");
while(cin.hasNext()){
String str = Main.deleteBlank(cin.nextLine());
System.out.println(str);
System.out.println("请输入");
}
}
}
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