Java如何输入不确定长度的数组

public static void main(String[] args) {
Scanner in = new Scanner(System.in);
List<Integer> list=new ArrayList<Integer>();
while (in.hasNext()) {
String s=in.nextLine();

String[] str=s.split(" ");
int[] a=new int[str.length];
for(int i=0;i<str.length;i++){
a[i]=Integer.parseInt(str[i]);
}

}
}

Arrays.sort(A);
List<Integer> list=new ArrayList<Integer>();
//数组去重
for(int i=0;i<A.length;i++){
if(A[i]>0&&!list.contains(A[i])){
list.add(A[i]);
System.out.print(A[i]+" ");
}
}

public static boolean isHuiWen(String text) {
int length = text.length();
for (int i = 0; i < length / 2; i++) {
if (text.toCharArray()[i] != text.toCharArray()[length - i - 1]) {
return false;
}
}
return true;
}