如何在 foreach 循环 java 中返回特定字段（函数？）最小值的对象

Question

我正在尝试从 for-each 循环中获取对象“Employee”的最小值。我创建了一些员工;// Create EmployeesEmployee Employee1 = new Employee(1, "Bradley", 0);Employee Employee2 = new Employee(2, "Patrick", 0);Employee Employee3 = new Employee(3, "Erin", 0);Employee Employee4 = new Employee(4, "Jim", 0);Employee Employee5 = new Employee(5, "Fredrick", 0);第三个参数是分配的协定数，默认情况下为 0。然后，我的代码分配一些合约，分配的合约数量增加等。然后，我从上述员工中创建一个数组，如下所示;Employee[] employees = new Employee[] {Employee1, Employee2, Employee3, Employee4, Employee5};我可以使用下面的循环打印分配给每个员工的合同数量;for (Employee employee : employees) {    System.out.println(employee.numberOfCurrentlyAssignedContracts);}我正在尝试返回具有最小员工数的员工。numberOfCurrentlyAssignedContracts，但不是返回它的int值，我希望返回整个员工对象，以便我可以对其调用单独的函数，例如：employee（具有最小价值的已分配合同）.assignmentContract - 将新合同分配给当前分配的合同数量最少的员工。那么基本上，我如何让 for-each 返回员工，而不是分配合同的整数？任何帮助将不胜感激。问候， B当所有三个提交的答案都有效时，我该怎么办？！谢谢。此外，如果2 +具有相同的最小值，我怎么能随机返回一名员工，例如，2名员工都分配了0个分配的合同。

Answer 1

像这样的东西应该可以解决问题。之后，您所要做的就是将合同分配给选定的人。

public static void main(String[] args) {

Employee employee1 = new Employee(1, "Bradley", 10);

Employee employee2 = new Employee(2, "Patrick", 70);

Employee employee3 = new Employee(3, "Erin", 50);

Employee employee4 = new Employee(4, "Jim", 4);

Employee employee5 = new Employee(5, "Fredrick", 8);

Employee[] employees = new Employee[] {employee1, employee2, employee3, employee4, employee5};

int employeeWithLeastContractsID = employees[0].getID();

int employeesWithLeastContractsTotal = employees[0].getContracts();;

for (Employee employee : employees) {

if(employee.getContracts() < employeesWithLeastContractsTotal){

    employeeWithLeastContractsID = employee.getID();

    employeesWithLeastContractsTotal = employee.getContracts();

}

}

System.out.println("Employee ID: "+employeeWithLeastContractsID + "\nEmployee contracts: "+employeesWithLeastContractsTotal);

}

Answer 2

您可以使用简单的 for 循环来查找具有最少数量合同的员工，如下所示：

int minContract = Integer.MAX_VALUE;

Employee empMin = null;

for (Employee employee : employees) {

    if (employee.getNumberOfCurrentlyAssignedContracts() < minContract) {

        // swap min and employee if true

        empMin = employee;

        minContract = empMin.getNumberOfCurrentlyAssignedContracts();

    }

}

现在，您有一个对具有最小协定的 employee 对象的引用：

System.out.println(empMin);

如果您使用的是java-8，那么您可以简单地执行以下操作：

Employee empMin = Arrays.stream(employees)

                        .min((e1, e2) -> 

                                  e1.getNumberOfCurrentlyAssignedContracts() - 

                                  e2.getNumberOfCurrentlyAssignedContracts())

                        .get();

Answer 3

怎么样：

Employee minEmployee = Arrays.stream(employees)
      .sorted(Comparator.comparing(Employee::getNumberOfCurrentlyAssignedContracts))
      .findFirst().get();

Answer 4

你可以做这样的事情

Employee ref = employees[0];

int min = ref.numberOfCurrentlyAssignedContracts;

for (Employee employee : employees) {

    if(min>employee.numberOfCurrentlyAssignedContracts){

         min = employee.numberOfCurrentlyAssignedContracts;

         ref = employee;

    }

}

然后做任何你想做的事情ref

当然，使用一个会容易得多ArrayList