stringbuilder.deletecharat

stringbuilder.deletecharat是一个Java中的方法，用于删除StringBuilder对象中指定位置的字符。具体使用方法如下：

StringBuilder sb = new StringBuilder("hello world");
sb.deleteCharAt(6); // 删除位置为6的字符，即w
System.out.println(sb.toString()); // 输出结果为"hello orld"

该方法会返回一个新的StringBuilder对象，因此需要将其赋值给原对象才能生效。

相关问题

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。

优化以下代码： 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); } salaryOpLogServiceClient.addSafeLog(SalaryOpLogModuleConstant.HRM_SALARY_MAINTAIN, SalaryOpLogTypeConstant.HRM_SALARY_FIXED_ITEM, describe.toString(), IdGenerator.generate(SalaryOpLogTypeConstant.HRM_SALARY_FIXED_ITEM));

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

String logDescription = describe.toString();
String logId = IdGenerator.generate(SalaryOpLogTypeConstant.HRM_SALARY_FIXED_ITEM);
salaryOpLogServiceClient.addSafeLog(SalaryOpLogModuleConstant.HRM_SALARY_MAINTAIN, SalaryOpLogTypeConstant.HRM_SALARY_FIXED_ITEM, logDescription, logId);

优化的主要改动是将 `describe.toString()`、`IdGenerator.generate(SalaryOpLogTypeConstant.HRM_SALARY_FIXED_ITEM)` 的结果分别保存在 `logDescription` 和 `logId` 变量中，以便于代码的可读性和维护性。然后，将最后一行的日志添加操作分离出来，使代码更加清晰。