12 2021 档案

摘要：FileInputStream file1 = new FileInputStream("E:/abc/hello.txt"); FileOutputStream file2 = new FileOutputStream("E:/cba/hello.txt"); int i = 0; while(( 阅读全文

摘要：public class Quchong { public void quchong(){//set集合 Scanner s = new Scanner(System.in); System.out.println("请输入一个字符串"); String a = s.next(); Set set 阅读全文