今天挑战的字符串转换成整数的程序

今天挑战了下庞果网的编程挑战题，一个字符串转换成整数的程序，看了别人的代码，自己觉得很惭愧（我的代码真是又臭又长）

第一次上传代码时没有测试完全，导致有几个情况不合格，修改了下，基本满足题目要求

求July能指点一二

package ex25;public class GlobalMembers {public static int StrToInt(String str){int temp;char digit;char firstOne = 0;int result[] = new int[]{-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1};boolean flag = true;  // 查找第一个字符的标志boolean isFirstDigit = true;  // 确认数字第一位的标志int num = 0;int j = 0;if(str.length() == 0){return 0;}// 获得整数字符串找出符号位        for(int i = 0; i < str.length(); i++){        digit = str.charAt(i);        temp = digit - '0';        if(((temp >= 0 && temp <= 9) || (digit == '-' || digit == '+')) && flag){        firstOne = digit;        if(firstOne != '-' && firstOne != '+'){        result[0] = temp;        }        flag = false;        continue;        }else if(digit == ' ' && firstOne == 0){        continue;        }        else if(flag){        return 0;        }        if(isFirstDigit){        if(firstOne - '0' >= 0 && firstOne - '0' <= 9){        j = 1;        }else if(firstOne == '-' || firstOne == '+'){        j = 0;        }        isFirstDigit = false;        }        if(temp >= 0 && temp <= 9){        result[j] = temp;        j++;        }else{        break;        }        }        // 得出最后的整数        int k = 0;        while(result[k] != -1){        num += result[k];        k++;        if(result[k] != -1)        num *= 10;        }        if(firstOne != '-'){        if(num < 0)        return Integer.MAX_VALUE;        else        return num;        }        else{        if(-1 * num > 0)        return Integer.MIN_VALUE;        else        return -1 * num;        }    }public static void main(String[] args) {// TODO 自动生成方法存根//Scanner sc = new Scanner(System.in);//System.out.println("Enter a number: ");//String s = sc.next();System.out.println("The number is " + StrToInt(""));System.out.println("The number is " + StrToInt("1"));System.out.println("The number is " + StrToInt("+1"));System.out.println("The number is " + StrToInt("-1"));System.out.println("The number is " + StrToInt("123"));System.out.println("The number is " + StrToInt("-123"));System.out.println("The number is " + StrToInt("010"));System.out.println("The number is " + StrToInt("+00131204"));System.out.println("The number is " + StrToInt("-01324000"));System.out.println("The number is " + StrToInt("2147483647"));System.out.println("The number is " + StrToInt("-2147483647"));System.out.println("The number is " + StrToInt("-2147483648"));System.out.println("The number is " + StrToInt("2147483648"));System.out.println("The number is " + StrToInt("-2147483649"));System.out.println("The number is " + StrToInt("abc"));System.out.println("The number is " + StrToInt("-abc"));System.out.println("The number is " + StrToInt("1a"));System.out.println("The number is " + StrToInt("23a8f"));System.out.println("The number is " + StrToInt("-3924x8fc"));System.out.println("The number is " + StrToInt("   321"));System.out.println("The number is " + StrToInt("   -321"));System.out.println("The number is " + StrToInt("123 456"));System.out.println("The number is " + StrToInt("123   "));System.out.println("The number is " + StrToInt("   - 321"));System.out.println("The number is " + StrToInt("   +4488"));System.out.println("The number is " + StrToInt("  +  413"));System.out.println("The number is " + StrToInt(" ++c"));System.out.println("The number is " + StrToInt(" ++1"));System.out.println("The number is " + StrToInt(" --2"));System.out.println("The number is " + StrToInt("  -2"));}}

运行效果如图