5.1（打包，测试）

package arrays.myArray;import java.util.Scanner;public class SortObject { private static int intercePosition = 0; // 记录单个运算数据的长度 private static int[] intercePositionIndex = null; // 记录“（”的下标 private static int[] intercePositionEnd = null; // 记录“）”的下标 public static void main(String[] args) {  Scanner input = new Scanner(System.in);  do {   System.out.println("请输入你要计算的字符串(注意：只能输入数字和加，减，乘除符号;输入完毕后,请直接回车):");   String numberString = input.next().trim();   // 判断输入的运算字符串是否符合规定   if (ispassString(numberString) == false) {    System.out.println("您输入的计算字符串有误,请正确输入!");   } else {    // 计算结果返回    System.out.println(interceResult(numberString));   }  } while (true); } // 判断是否有带括号的运算字符串存在 private static String interceResult(String str) {  String result = str;  char[] numberString = str.toCharArray(); // 1+2+(1*2+1-1*2+5)+2+(1+5+9+10-11)+1*5/2+3  // 1+8-9+(1*8/2-5+(1+2+8))+4/5*8/3*2  int IndexStart = 0; // 记录“（”的实际数量  int EndStart = 0; // 记录“）”的实际数量  for (int i = 0; i < numberString.length; i++) {   if ('(' == numberString[i]) {    // 记录最后一个正括号的位置    IndexStart = i;   }   if (')' == numberString[i]) {    // 记录反括号的最初始下标的位置    EndStart = i;    // 截取最里面一个括号里的运算字符串    result = result.substring(IndexStart + 1, EndStart);    // 截取括号的运算字符串进行运算,生成新的运算字符串    result = str.substring(0, IndexStart)      + interceptOperation(result, '*', '/')      + str.substring(EndStart + 1, str.length());    // 回调执行，其它小括号的运算字符串    return interceResult(result);   }   if (i == numberString.length - 1)    if (EndStart == 0)     break;  }  // 不存在括号了，再进行混合运算  result = interceptOperation(str, '*', '/');  return result; } // 不带括号的四则运算 private static String interceptOperation(String operationNumber, char a,   char b) {  String mess = operationNumber;  char[] stringOperation = mess.toCharArray();  // 循环遍历运算字符串，并做相应的运算  for (int i = 0; i < stringOperation.length; i++) {   // 判断运算符所在的索引   if (stringOperation[i] == a || stringOperation[i] == b) {    if (i != 0) {     // 运算符前的第一个数     double num1 = interceptNumIndex(mess.substring(0, i));     // 记录第一个数据的长度     int frontPosition = intercePosition;     // 运算符前的第二个数     double num2 = interceptNumEnd(mess.substring(i + 1,       stringOperation.length));     // 记录第二个数据的长度     int backPosition = intercePosition;     // 算完乘除，将结果替换到原来运算的位置，得到新的运算字符串     String IndexMess = mess.substring(0, i - frontPosition + 1);     String IndexResult = "";     // 判断是否运算到最后的结果了     if (IndexMess.indexOf('+') == -1       && IndexMess.indexOf('*') == -1       && IndexMess.indexOf('/') == -1       && IndexMess.lastIndexOf('-') == -1)      IndexMess = "";     if (IndexMess != "")      IndexResult = IndexMess.lastIndexOf('-') == IndexMess        .length() - 1 ? IndexMess.substring(0, i        - frontPosition) : IndexMess;     // 组装新的运算字符串     mess = IndexResult// mess.substring(0,i-frontPosition+1)       + reslutString("" + stringOperation[i], num1, num2)       + mess.substring(i + backPosition + 1);     // 0.111/1212/2/2/2/2/2/2/2     if (mess.lastIndexOf('-') == 0 && mess.indexOf('+') == -1       && mess.indexOf('*') == -1       && mess.indexOf('/') == -1) {      break;     }     // 回调，继续运算     return interceptOperation(mess, a, b);// 1+7-5+89/3+4-6*8/2+4-6    } else     continue;   }   if (i == stringOperation.length - 1) {    // 递归出口，判断是否还有运算字符串在    if (mess.indexOf('+') != -1 || mess.indexOf('-') != -1)     return interceptOperation(mess, '+', '-');    break;   }  }  return mess; } // 截取第二个数 private static double interceptNumEnd(String str) {  double a = 0;  int InrerceIndex = 0;  char[] stringOperation = str.toCharArray();  boolean ispas = false; // 记录是否为负数  for (int i = 0; i < stringOperation.length; i++) {   switch (stringOperation[i]) {   case '*':   case '/':   case '+':   case '-':    InrerceIndex = i;    if (i != 0) // 判断该数是否为负数     ispas = true;    break;   default:    break;   }   if (ispas)    break;  }  // 判断此数据是否在运算字符串的最后一位  if (InrerceIndex == 0) {   a = Double.parseDouble(str);   intercePosition = str.length();   if (ispas)    intercePosition++;  } else {   a = Double.parseDouble(str.substring(0, InrerceIndex));   // 记录数据的真实长度   intercePosition = str.substring(0, InrerceIndex).length();  }  return a; } // 截取第一个数 private static double interceptNumIndex(String str) {  double a = 0; // 记录数据  int InrerceIndex = 0; // 记录运算符的位置  boolean temp = false; // 记录数据前运算符的状态  char[] stringOperation = str.toCharArray();  for (int i = stringOperation.length - 1; i >= 0; i--) {   switch (stringOperation[i]) {   case '*':   case '/':   case '+':   case '-':    InrerceIndex = i;    temp = true;    break;   default:    break;   }   if (temp)    break;  }  // 判断此数据是否在运算字符串的第一位  if (InrerceIndex == 0) {   a = Double.parseDouble(str);   intercePosition = str.length();   // if(temp)   // intercePosition++;  } else {   a = Double.parseDouble(str.substring(InrerceIndex, str.length()));   // 记录数据的真实长度   intercePosition = str.substring(InrerceIndex, str.length())     .length();  }  return a; } // 计算结果 private static double reslutString(String operation, double num1,   double num2) {  double sumResult = 0;  if (operation.equals("*"))   sumResult = num1 * num2;  if (operation.equals("-"))   sumResult = num1 - num2;  if (operation.equals("/"))   sumResult = num1 / num2;  if (operation.equals("+"))   sumResult = num1 + num2;  return sumResult; } // 判断是否正确输入运算方式 private static boolean ispassString(String messString) {  boolean ispass = false;  boolean operationIspass = true; // 记录被除数的状态  int ai = 0; // 记录是否有运算符号的存在  char[] IsString = messString.toCharArray();  int num1 = 0;  int num2 = 0;  for (int i = 0; i < IsString.length; i++) {   // 记录有几对小括号的存在   if ('(' == IsString[i])    num1++;   if (')' == IsString[i])    num2++;   // 判断除数是否为零   if ('/' == IsString[i] && IsString[i + 1] == '0')    operationIspass = false;   // 判断是否输入了运算符合   if (IsString[i] == '+' || IsString[i] == '-' || IsString[i] == '*'     || IsString[i] == '/')    ai++;   if (i == IsString.length - 1)    if (ai == 0)     num2++;  }  if (operationIspass)   if (num1 == num2)    ispass = true;  return ispass; }}

package test.test;public class Core {    int sumResult=0;    static double test1(String operation, double num1,double num2) {              double sumResult = 0;              if (operation.equals("*"))               sumResult = num1 * num2;              if (operation.equals("-"))               sumResult = num1 - num2;              if (operation.equals("/"))               sumResult = num1 / num2;              if (operation.equals("+"))               sumResult = num1 + num2;              return sumResult;             }}

package test.test;import static org.junit.Assert.*;import org.junit.Before;import org.junit.Test;public class CoreTest {    @Before    public void setUp() throws Exception {    }    @Test    public void test() {        Core core = new Core();        double a = core.test1("+",1,3);        assertEquals(4,a);    }}