/* * 提示:郵箱地址不合法的因素: 2.1.1郵箱地址中不包含@或. * 2.1.2郵箱地址中含有多了@或. * 2.1.3郵箱地址中.出現在@的前面 * 2.1.4
阿新 • • 發佈:2018-12-31
Scanner s = new Scanner(System.in); String d = s.next(); pf(d); if (pf(d) == false) { System.out.println("輸入格式有誤"); return; } else { panduan(d); } } // String d="[email protected]@qq.com"; static void panduan(String d) { if (d.indexOf(".") == 0 || d.indexOf(".") == 0 || d.indexOf(".") == 0 && d.indexOf(".") == 0) { System.out.println("格式輸入有誤"); return; } if (d.indexOf(".") != d.lastIndexOf(".") || d.indexOf(".") == 0) { System.out.println("輸入有誤"); return; } if (d.indexOf("@") != d.lastIndexOf("@") || d.indexOf("@") == 0) { System.out.println("輸入有誤"); return; } if (d.indexOf(".") < d.indexOf("@")) { System.out.println("輸入有誤"); return; } isok(d); { if (isok(d) == true) { System.out.println("輸入正確"); } else { System.out.println("輸入有誤"); } } } static boolean isok(String d) { boolean b = false; String[] a = d.split("@"); try { // int c2=Integer.parseInt(a[0]); int c1 = Integer.parseInt(a[0]); long t = 10000000000000000L; c1 /= t; // System.out.println(c1); for (int i = 0; i < 10; i++) { if (c1 == i) { b = true; break; } else { b = false; } } } catch (NumberFormatException e) { // System.out.println("輸入有誤"); } // System.out.println(b+"000"); return b; } static boolean pf(String d) { boolean b = false; String y; for (int i = 0; i < d.length(); i++) { y = d.substring(i); // System.out.println(y); b = y.startsWith("@") || y.startsWith(".") ? true : false; if (b == true) { break; } else { b = false; } } return b; }