5、把鍵盤輸入工具類TSUtility添加到項目中
直接將提供的TSUtility.java文件拷貝到com.atguigu.util包中，發現須要修改包名。java
第二發現出現亂碼，由於提供的文件是UTF-8格式的，若是你默認的項目字符編碼爲GBK的話，就會亂碼，解決辦法能夠用記事本打開TSUtility.java文件，把代碼複製到eclipse中。或者修改項目的字符編碼爲UTF-8，不過設置項目字符編碼最好在項目一開始。eclipse
| package com.atguigu.util;工具
import java.util.*;大數據
public class TSUtility {ui private static Scanner scanner = new Scanner(System.in);編碼
public static char readMenuSelection() {spa char c;orm for (; ; ) {教程 String str = readKeyBoard(1, false);ip c = str.charAt(0); if (c != '1' && c != '2' && c != '3' && c != '4') { System.out.print("選擇錯誤，請從新輸入："); } else break; } return c; }
public static void readReturn() { System.out.print("按回車鍵繼續..."); 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("數字輸入錯誤，請從新輸入："); } } 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("選擇錯誤，請從新輸入："); } } 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("輸入長度（不大於" + limit + "）錯誤，請從新輸入："); continue; } break; }
return line; } } |
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