某外包公司笔试题

Wed, 05 Mar 2008 06:21:00 GMT

�~�程题：��L��字符串中多余�?0",
例如
0-->0
3-->3
000-->0
01010-->101
301100-->3011
00103-->103
1020.00-->1020
001.0100-->1.01
00.003-->0.003
若字�W�串中字�W?,E+-)则�ؓ非法字符丌Ӏ?/p>

public class RemoveZero {

    /**
         * @param args
         */
    static String removeFirst(String str) {
    while (true) {
        if (str.length() > 1) {
        char c = str.charAt(0);
        char nextC = str.charAt(1);
        if (c != '0') {
            break;
        } else {
            if (nextC == '.') {
            break;
            } else {
            str = str.substring(1);
            }
        }
        } else {
        break;
        }
    }
    return str;
    }

    static String removeLast(String str) {
    while (true) {
        if (str.length() > 1) {
        char c = str.charAt(str.length() - 1);
        char beforeC = str.charAt(str.length() - 2);
        if (c != '0') {
            break;
        } else {
            if (beforeC == '.') {
            str = str.substring(0, str.length() - 2);
            break;
            } else {
            str = str.substring(0, str.length() - 1);
            }
        }
        } else {
        break;
        }
    }
    return str;
    }

    static boolean isCorrect(String str) {
    return !str.contains("E") && !str.contains(",") && !str.contains("+")
        && !str.contains("-");
    }

    public static void main(String[] args) {
    String str = "003E+3";
    if (isCorrect(str)) {
        System.out.println(str + "-->" + removeLast(removeFirst(str)));
    } else {
        System.out.println("字符串中含有非法字符(,E+-)!");
    }
    str = "0";
    if (isCorrect(str)) {
        System.out.println(str + "-->" + removeLast(removeFirst(str)));
    } else {
        System.out.println("字符串中含有非法字符,E+-!");
    }
    str = "3";
    if (isCorrect(str)) {
        System.out.println(str + "-->" + removeLast(removeFirst(str)));
    } else {
        System.out.println("字符串中含有非法字符,E+-!");
    }
    str = "000";
    if (isCorrect(str)) {
        System.out.println(str + "-->" + removeLast(removeFirst(str)));
    } else {
        System.out.println("字符串中含有非法字符,E+-!");
    }
    str = "01010";
    if (isCorrect(str)) {
        System.out.println(str + "-->" + removeLast(removeFirst(str)));
    } else {
        System.out.println("字符串中含有非法字符,E+-!");
    }
    str = "301100";
    if (isCorrect(str)) {
        System.out.println(str + "-->" + removeLast(removeFirst(str)));
    } else {
        System.out.println("字符串中含有非法字符,E+-!");
    }
    str = "00103";
    if (isCorrect(str)) {
        System.out.println(str + "-->" + removeLast(removeFirst(str)));
    } else {
        System.out.println("字符串中含有非法字符,E+-!");
    }
    str = "1020.00";
    if (isCorrect(str)) {
        System.out.println(str + "-->" + removeLast(removeFirst(str)));
    } else {
        System.out.println("字符串中含有非法字符,E+-!");
    }
    str = "001.0100";
    if (isCorrect(str)) {
        System.out.println(str + "-->" + removeLast(removeFirst(str)));
    } else {
        System.out.println("字符串中含有非法字符,E+-!");
    }
    str = "00.003";
    if (isCorrect(str)) {
        System.out.println(str + "-->" + removeLast(removeFirst(str)));
    } else {
        System.out.println("字符串中含有非法字符,E+-!");
    }
    }
}

我�ؓJ�?/a> 2008-03-05 14:21 发表评论

Thu, 17 May 2007 10:50:00 GMT

大家都知道，��Z��试�Q�开发�h员经常在代码中加入System.out.println()�q�样的测试语句，但是�q�样做�ƈ不好�Q�尤其是��打印语句写在��@环中的时候，更加影响性能。正��的�Ҏ��应当是引入一个包装器�Ҏ��?br>

/*
*@author 我�ؓJ�?nbsp;建立日期 2007-5-17
*
*/

public class Test
{
    public static final int DEBUG_MODE = 1;

    public static final int RUN_MODE = 2;

    public static void calculationWithPrint(int logMode)
    {
        double someValue = 0D;
        for (int i = 0; i < 100; i++)
        {
            someValue = someValue + i;
            myPrintMethod(logMode, someValue);//不要直接写System.out.prinltn()�Q�否则很影响性能�?/span>
        }
    }

    public static void myPrintMethod(int logMode, double value)
    {

        if (logMode > Test.DEBUG_MODE)
        {
            return;
        }

        System.out.println(value);
    }

    public static void main(String[] n)
    {
        Test.calculationWithPrint(Test.RUN_MODE);//�q�行模式�Q�不执行System.out.println();
        Test.calculationWithPrint(Test.DEBUG_MODE);//调试模式�Q�执行System.out.println();
    }
}

我�ؓJ�?/a> 2007-05-17 18:50 发表评论

Wed, 18 Apr 2007 13:27:00 GMT

try
{
   Runtime.getRuntime().exec ("c:\\Program Files\\Windows NT\\Accessories\\wordpad.exe F:\\xxxx.java" );
   }
catch(IOException e)
{
   e.printStackTrace();
}

以上的代码实现的功能是：用记事本�E�序打开Java文�gF:\\xxxx.java

我�ؓJ�?/a> 2007-04-18 21:27 发表评论

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某外包公司笔试题