写着玩的，查找并替换字符串

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scanner=new Scanner(System.in);
		while(scanner.hasNext())
		{
			String aString=scanner.nextLine();
			String bString=scanner.nextLine();
			while(bString.indexOf(aString)!=-1)
			{
				bString=bString.replace(aString,"");
			}
			System.out.println(bString);
		}
}
	}
	这个方法要超时