src.zip

package Question_First; import java.util.Scanner; public class Third_Email_Check { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("请输入Java源文件名"); String javaname = sc.next(); System.out.println("请输入Email地址"); String emailname = sc.next(); checkjava(javaname); checkemail(emailname); } public static void checkjava(String name) { boolean ok = true; int index = name.lastIndexOf('.') + 1; //获取后缀名 String last = name.substring(index); if (!last.equals("java")) ok = false; //System.out.println(ok); //检验非法字符(写几个象征性的) char[] failchar = {'!', '@', '#', '%', '^', '&', '*', '(', ')', '-', '=', '+'}; String first = name.substring(0,index); for (int i = 0; i < failchar.length; i++) { // System.out.println(first.indexOf(failchar[i])); if (first.indexOf(failchar[i]) != -1) { ok = false; break; } //System.out.println(ok); } //检测开头(无需检查文件开头大小写) if (!Character.isLetter(name.charAt(0))) ok = false; // System.out.println(ok); if (ok) { System.out.println("这个java源文件是合法的"); } else { System.out.println("这个java源文件是非法的"); } } public static void checkemail(String name) { boolean ok = true; //得到@后的字符串 StringBuilder maillast = new StringBuilder(name.substring(name.lastIndexOf('@') + 1)); System.out.println(maillast); int _pointcount = 0; //查找是否有多余的'.' while (true) { int index = maillast.indexOf("."); if(index == -1){ ok = false; break; } if (index != 0) { maillast.replace(index, index, " "); _pointcount++; break; } } if (_pointcount != 1) { ok = false; } if (ok) { System.out.println("这个Email地址是合法的"); } else { System.out.println("这个Email地址是非法的"); } } }