优化以下代码： StringBuilder describe = new StringBuilder(); if (deleteName.length() > 0) { deleteName.deleteCharAt(deleteName.length() - 1); describe.append(String.format(SalaryTypeConstant.DELETE_FIXED_SALARY_FIELD, deleteName)).append(","); } if (updateName.length() > 0) { updateName.deleteCharAt(updateName.length() - 1); describe.append(String.format(SalaryTypeConstant.UPDATE_FIXED_SALARY_FIELD, updateName)).append(","); } if (addName.length() > 0) { addName.deleteCharAt(addName.length() - 1); describe.append(String.format(SalaryTypeConstant.ADD_FIXED_SALARY_FIELD, addName)).append(","); } if (describe.length() > 0) { describe.deleteCharAt(describe.length() - 1); }

以下是对代码进行优化的建议：

StringBuilder describe = new StringBuilder();
if (deleteName.length() > 0) {
    describe.append(String.format(SalaryTypeConstant.DELETE_FIXED_SALARY_FIELD, deleteName.deleteCharAt(deleteName.length() - 1)));
    describe.append(",");
}
if (updateName.length() > 0) {
    describe.append(String.format(SalaryTypeConstant.UPDATE_FIXED_SALARY_FIELD, updateName.deleteCharAt(updateName.length() - 1)));
    describe.append(",");
}
if (addName.length() > 0) {
    describe.append(String.format(SalaryTypeConstant.ADD_FIXED_SALARY_FIELD, addName.deleteCharAt(addName.length() - 1)));
    describe.append(",");
}
if (describe.length() > 0) {
    describe.deleteCharAt(describe.length() - 1);
}

优化的主要改动是将 `deleteName.deleteCharAt(deleteName.length() - 1)` 直接放入 `String.format()` 方法中，避免了多余的操作。同时，将 `describe.append(",")` 的操作提前到 `if` 条件中，避免了不必要的判断和操作。