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刚刚了解了最近的哈希映射。到目前为止,我的代码可以添加,删除,打印性能比例,并排序员工的最后/第一个姓名。但是,更新/修改没有做任何事情。我的尝试是,首先搜索我想更新的员工ID。输入他们的ID后,我会提示用户修改性能比例,但之后如果用户打印出所有性能比例,它仍然不会改变任何内容。哈希映射,无法修改/更新
因此,有关如何更新的任何建议/提示/链接都很有帮助。这是我的代码的一部分,涵盖所有情况。 (情况3是更新/修改,显示了我对它的尝试工作)。
switch (choice) {
case 1:
addEmployee(firstAndLast, idNumber, performanceScale);
break;
case 2:
removeEmployee(firstAndLast, idNumber, performanceScale);
break;
case 3:
modifyPerformanceScale(idNumber);
break;
case 4:
printAllperfScale(performanceScale);
break;
case 5:
printLastNameAscending(firstAndLast);
break;
case 6:
exit = true;
System.out.println("Exiting program...");
break;
default:
System.out
.println("Please choose a number from 1 - 5 from the menu.");
}
}
}
public static void addEmployee(TreeMap<String, Employee> firstAndLastMap,
TreeMap<Integer, Employee> idNumberMap,
TreeMap<Employee, Integer> performanceScale) {
Scanner keyboardInput = new Scanner(System.in);
String firstName;
String lastName;
int id;
int perfScale;
System.out.print("Enter first name for the Employee: ");
firstName = keyboardInput.nextLine();
System.out.print("Enter last name for the Employeer: ");
lastName = keyboardInput.nextLine();
System.out.print("Enter ID number of the Employee: ");
id = keyboardInput.nextInt();
System.out.print("Enter Performance Scale rating between 1 to 5: ");
perfScale = keyboardInput.nextInt();
Employee addEmployee = new Employee(lastName, firstName, id, perfScale);
firstAndLastMap.put(lastName + ", " + firstName, addEmployee);
idNumberMap.put(id, addEmployee);
performanceScale.put(addEmployee, perfScale);
}
public static void removeEmployee(TreeMap<String, Employee> firstAndLastMap,
TreeMap<Integer, Employee> idNumberMap,
TreeMap<Employee, Integer> performanceScale) {
Scanner keyboardInput = new Scanner(System.in);
String firstName;
String lastName;
int id;
System.out.print("Enter First name of Employee you want to remove: ");
firstName = keyboardInput.nextLine();
System.out.print("Enter last name of Employee you want to remove: ");
lastName = keyboardInput.nextLine();
System.out.print("Enter ID number of Employee you want to remove: ");
id = keyboardInput.nextInt();
firstAndLastMap.remove(lastName + ", " + firstName);
idNumberMap.remove(id);
}
public static void modifyPerformanceScale(TreeMap<Integer, Employee> idNumber) {
System.out.print("Enter ID: ");
Scanner keyboardInput = new Scanner(System.in);
int idNumber1;
int modScale;
idNumber1 = keyboardInput.nextInt();
idNumber.remove(idNumber1);
System.out.print("Enter the number you want to change to: ");
modScale = keyboardInput.nextInt();
}
public static void printAllperfScale(TreeMap<Employee,Integer> performanceScale) {
Set Employee1 = performanceScale.entrySet();
Iterator itr1 = Employee1.iterator();
while (itr1.hasNext()) {
Map.Entry me = (Map.Entry) itr1.next();
System.out.println(me.getValue());
}
}
public static void printLastNameAscending(TreeMap<String, Employee> LastName) {
Set Employee1 = LastName.entrySet();
Iterator itr1 = Employee1.iterator();
while (itr1.hasNext()) {
Map.Entry me = (Map.Entry) itr1.next();
System.out.println(me.getKey());
}
}
}
好的谢谢你的回复先生。我会照你的要求去做,并确保我明白代码的原因。 :)几分钟后,我会点击复选标记。 – Christian
我注意到一个bug并修复了它。一定要使用编辑的答案。 –
好的,谢谢你的贡献。 :)感谢帮助。 – Christian