问如果equals和hashcode在hashmap中比较不同的值怎么办？

EN

public class Employee {
    private String empId;
    private String empName;

    public Employee(String empId, String empName) {
        super();
        this.empId = empId;
        this.empName = empName;
    }

    @Override
    public int hashCode() {

        return empName.hashCode();
    }

    @Override
    public boolean equals(Object obj) {

        if (obj == null)
            return false;
        Employee employee = (Employee) obj;
        return this.empId.equals(employee.empId);
    }

    @Override
    public String toString() {
        return "Employee [empId=" + empId + ", empName=" + empName + "]";
    }

}

public class TestHashCode {
    public static void main(String[] args) {
        HashMap<Employee, String> map = new HashMap<Employee, String>();

        /**
         * Below two object are unequal by equals method and have same hash
         * code. Both employee1 & employee2 will be stored in same bucket
         * Corresponding to hash code in a linked list.
         */
        Employee employee1 = new Employee("123", "abc");
        Employee employee2 = new Employee("124", "abc");

        map.put(employee1, "abc");
        map.put(employee2, "xyz");
        // output:Collosionresult:abc,xyz
        System.out.println("Collosionresult:" + map.get(employee1) + ","
                + map.get(employee2));

        /**
         * Below two object are equal by equals method and have same hash code.
         * Value will be overridden. Meaning both employee3 & employee4 will get
         * the same value ie. the most recently updated value(world).
         */
        Employee employee3 = new Employee("hello", "pqr");
        Employee employee4 = new Employee("hello", "pqr");
        map.put(employee3, "hello");
        map.put(employee4, "world");
        //Output:OverriddenResult:world,world
        System.out.println("OverriddenResult:" + map.get(employee3) + ","
                + map.get(employee4));          

    }