if-else的优化举例

共有部分：

            String bookFrom = null;
            String sheetFrom = null;
            String bookTo = null;
            String sheetTo = null;
            String matchColumnFrom = null;
            String updateValueFrom = null;
            String matchColumnTo = null;
            String updateValueTo = null;

            String[] splitTwoSheets = parameters.split(";");
            boolean flag1 = splitTwoSheets[0].contains(""");
            boolean flag2 = splitTwoSheets[1].contains(""");    

优化前：

　　　　　　　if(flag1 && flag2){
                int lastIndexOfQuotes0 = splitTwoSheets[0].lastIndexOf(""");
                String Wb1AndSheet1 = splitTwoSheets[0].substring(0,lastIndexOfQuotes0).replaceAll(""","");
                String[] splitWb1AndSheet1 = Wb1AndSheet1.split("->");
                separatedParameters[1] = splitWb1AndSheet1[0].trim();
                separatedParameters[2] = splitWb1AndSheet1[1].trim();
                int length0 = splitTwoSheets[0].length();
                String stringColumns0 = splitTwoSheets[0].substring(lastIndexOfQuotes0,length0).replaceAll(""","");
                stringColumns0 = deleteExtraBlanks(stringColumns0);
                String[] splitColumns0 = stringColumns0.trim().split(" ");
                separatedParameters[5] = splitColumns0[0];
                separatedParameters[6] = splitColumns0[1];
                int lastIndexOfQuotes1 = splitTwoSheets[1].lastIndexOf(""");
                String Wb2AndSheet2 = splitTwoSheets[1].substring(0,lastIndexOfQuotes1).replaceAll(""","");
                String[] splitWb2AndSheet2 = Wb2AndSheet2.split("->");
                separatedParameters[3] = splitWb2AndSheet2[0].trim();
                separatedParameters[4] = splitWb2AndSheet2[1].trim();
                int length1 = splitTwoSheets[1].length();
                String stringColumns1 = splitTwoSheets[1].substring(lastIndexOfQuotes1,length1).replaceAll(""","");
                stringColumns1 = deleteExtraBlanks(stringColumns1);
                String[] splitColumns1 = stringColumns1.trim().split(" ");
                separatedParameters[7] = splitColumns1[0];
                separatedParameters[8] = splitColumns1[1];

            } else if(flag1 && !flag2){
                int lastIndexOfQuotes0 = splitTwoSheets[0].lastIndexOf(""");
                String Wb1AndSheet1 = splitTwoSheets[0].substring(0,lastIndexOfQuotes0).replaceAll(""","");
                String[] splitWb1AndSheet1 = Wb1AndSheet1.split("->");
                separatedParameters[1] = splitWb1AndSheet1[0].trim();
                separatedParameters[2] = splitWb1AndSheet1[1].trim();
                int length0 = splitTwoSheets[0].length();
                String stringColumns0 = splitTwoSheets[0].substring(lastIndexOfQuotes0,length0).replaceAll(""","");
                stringColumns0 = deleteExtraBlanks(stringColumns0);
                String[] splitColumns0 = stringColumns0.trim().split(" ");
                separatedParameters[5] = splitColumns0[0];
                separatedParameters[6] = splitColumns0[1];

                separatedParameters[3] = "";
                splitTwoSheets[1] = deleteExtraBlanks(splitTwoSheets[1]);
                String[] splitSheetAndColumns = splitTwoSheets[1].trim().split(" ");
                separatedParameters[4] = splitSheetAndColumns[0];
                separatedParameters[7] = splitSheetAndColumns[1];
                separatedParameters[8] = splitSheetAndColumns[2];

            } else if(!flag1 && flag2){
                int lastIndexOfQuotes1 = splitTwoSheets[1].lastIndexOf(""");
                String Wb2AndSheet2 = splitTwoSheets[1].substring(0,lastIndexOfQuotes1).replaceAll(""","");
                String[] splitWb2AndSheet2 = Wb2AndSheet2.split("->");
                separatedParameters[3] = splitWb2AndSheet2[0].trim();
                separatedParameters[4] = splitWb2AndSheet2[1].trim();
                int length1 = splitTwoSheets[1].length();
                String stringColumns1 = splitTwoSheets[1].substring(lastIndexOfQuotes1,length1).replaceAll(""","");
                stringColumns1 = deleteExtraBlanks(stringColumns1);
                String[] splitColumns1 = stringColumns1.trim().split(" ");
                separatedParameters[7] = splitColumns1[0];
                separatedParameters[8] = splitColumns1[1];

                separatedParameters[1] = "";
                splitTwoSheets[0] = deleteExtraBlanks(splitTwoSheets[0]);
                String[] splitSheetAndColumns = splitTwoSheets[0].trim().split(" ");
                separatedParameters[2] = splitSheetAndColumns[0];
                separatedParameters[5] = splitSheetAndColumns[1];
                separatedParameters[6] = splitSheetAndColumns[2];

            } else{
                separatedParameters[1] = "";
                splitTwoSheets[0] = deleteExtraBlanks(splitTwoSheets[0]);
                String[] splitSheetAndColumns0 = splitTwoSheets[0].trim().split(" ");
                separatedParameters[2] = splitSheetAndColumns0[0];
                separatedParameters[5] = splitSheetAndColumns0[1];
                separatedParameters[6] = splitSheetAndColumns0[2];

                separatedParameters[3] = "";
                splitTwoSheets[1] = deleteExtraBlanks(splitTwoSheets[1]);
                String[] splitSheetAndColumns1 = splitTwoSheets[1].trim().split(" ");
                separatedParameters[4] = splitSheetAndColumns1[0];
                separatedParameters[7] = splitSheetAndColumns1[1];
                separatedParameters[8] = splitSheetAndColumns1[2];
            }

优化后：

            if(flag1){
                bookFrom = splitTwoSheets[0].split("->")[0].replace(""","").trim();
                sheetFrom = splitTwoSheets[0].split("->")[1].split(""")[0].trim();
                String columnFrom1 = splitTwoSheets[0].split("->")[1].split(""")[1];
                columnFrom1 = deleteExtraBlanks(columnFrom1);
                matchColumnFrom = columnFrom1.trim().split(" ")[0];
                updateValueFrom = columnFrom1.trim().split(" ")[1];
            } else{
                bookFrom = "";
                splitTwoSheets[0] = deleteExtraBlanks(splitTwoSheets[0]);
                sheetFrom = splitTwoSheets[0].trim().split(" ")[0];
                matchColumnFrom = splitTwoSheets[0].trim().split(" ")[1];
                updateValueFrom = splitTwoSheets[0].trim().split(" ")[2];
            }
            if(flag2){
                bookTo = splitTwoSheets[1].split("->")[0].replace(""","").trim();
                sheetTo = splitTwoSheets[1].split("->")[1].split(""")[0].trim();
                String columnTo = splitTwoSheets[1].split("->")[1].split(""")[1];
                columnTo = deleteExtraBlanks(columnTo);
                matchColumnTo = columnTo.trim().split(" ")[0];
                updateValueTo = columnTo.trim().split(" ")[1];

            } else{
                bookTo = "";
                splitTwoSheets[1] = deleteExtraBlanks(splitTwoSheets[1]);
                sheetTo = splitTwoSheets[1].trim().split(" ")[0];
                matchColumnTo = splitTwoSheets[1].trim().split(" ")[1];
                updateValueTo = splitTwoSheets[1].trim().split(" ")[2];

            }
            separatedParameters[1] = bookFrom;
            separatedParameters[2] = sheetFrom;
            separatedParameters[3] = bookTo;
            separatedParameters[4] = sheetTo;
            separatedParameters[5] = matchColumnFrom;
            separatedParameters[6] = updateValueFrom;
            separatedParameters[7] = matchColumnTo;
            separatedParameters[8] = updateValueTo;

优化后，既防止出错、对应不上的问题，而且使代码更加简洁