问题描述：输入两个字符串，从第一字符串中删除第二个字符串中所有的字符。
例如，输入”They are students.”和”aeiou”，则删除之后的第一个字符串变成”Thy r stdnts.”
Demo_1:
package com.studentmanager.www;
import java.util.Scanner;
public class Test6 {
public static void main(String[] args){
Scanner input = new Scanner(System.in);
System.out.println("请输入两行字符串-------");
String s1 = input.nextLine();
String s2 = input.nextLine();
StringBuffer sb = new StringBuffer();
for(int i=0;i<s1.length();i++){
if(!s2.contains(s1.charAt(i)+"") ){
sb.append(s1.charAt(i));
}
}
System.out.println(s2.contains(" "));
System.out.println(sb);
}
}
// They are students.
// aeiou
运行结果：
They are students.
aeiou
false
Thy r stdnts.
