JavaSE进阶
5、把键盘输入工具类TSUtility添加到项目中
直接将提供的TSUtility.java文件拷贝到com.atguigu.util包中，发现需要修改包名。
第二发现出现乱码，因为提供的文件是UTF-8格式的，如果你默认的项目字符编码为GBK的话，就会乱码，解决办法可以用记事本打开TSUtility.java文件，把代码复制到eclipse中。或者修改项目的字符编码为UTF-8，不过设置项目字符编码最好在项目一开始。
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package com.atguigu.util;
import java.util.*;
public class TSUtility { private static Scanner scanner = new Scanner(System.in);
public static char readMenuSelection() { char c; for (; ; ) { String str = readKeyBoard(1, false); c = str.charAt(0); if (c != '1' && c != '2' && c != '3' && c != '4') { System.out.print("选择错误，请重新输入："); } else break; } return c; }
public static void readReturn() { System.out.print("按回车键继续..."); readKeyBoard(100, true); }
public static int readInt() { int n; for (; ; ) { String str = readKeyBoard(2, false); try { n = Integer.parseInt(str); break; } catch (NumberFormatException e) { System.out.print("数字输入错误，请重新输入："); } } return n; }
public static char readConfirmSelection() { char c; for (; ; ) { String str = readKeyBoard(1, false).toUpperCase(); c = str.charAt(0); if (c == 'Y' || c == 'N') { break; } else { System.out.print("选择错误，请重新输入："); } } return c; }
private static String readKeyBoard(int limit, boolean blankReturn) { String line = "";
while (scanner.hasNextLine()) { line = scanner.nextLine(); if (line.length() == 0) { if (blankReturn) return line; else continue; }
if (line.length() < 1 || line.length() > limit) { System.out.print("输入长度（不大于" + limit + "）错误，请重新输入："); continue; } break; }
return line; } } |
