Java容器涉及的类（代码）

Customer：

 public class Customer implements Comparable{
         private Integer customerId;
         private String customerName;

         public Integer getCustomerId() {
             return customerId;
         }
         public void setCustomerId(Integer customerId) {
             this.customerId = customerId;
         }
         public String getCustomerName() {
             return customerName;
         }
         public void setCustomerName(String customerName) {
             this.customerName = customerName;
         }
         public Customer(Integer customerId, String customerName) {
             this.customerId = customerId;
             this.customerName = customerName;
         }
     @Override
         public String toString() {
             return "Customer [customerId=" + customerId + ", customerName="
                     + customerName + "]";
         }
     public Customer() {
         }
     @Override
     public int hashCode() {
         final int prime = 31;
         int result = 1;
         result = prime * result + customerId;
         result = prime * result
                 + ((customerName == null) ? 0 : customerName.hashCode());
         return result;
     }
     @Override
     public boolean equals(Object obj) {
         if (this == obj)
             return true;
         if (obj == null)
             return false;
         if (getClass() != obj.getClass())
             return false;
         Customer other = (Customer) obj;
         if (customerId != other.customerId)
             return false;
         if (customerName == null) {
             if (other.customerName != null)
                 return false;
         } else if (!customerName.equals(other.customerName))
             return false;
         return true;
     }
      //TreeSet类按照compareTo方法比较返回
      //按id或name排序
     @Override
     public int compareTo(Object o) {
         if(o instanceof Customer){
             Customer c=(Customer) o;
             //给整体添加'-'号改变正/逆序
 //            return this.customerId-c.customerId;
             return this.customerName.compareTo(c.customerName);
         }
         return 0;
     }
 }

CustomerComparator：

 import java.util.Comparator;
 public class CustomerComparator implements Comparator{
     @Override
     public int compare(Object o1, Object o2) {
         if(o1 instanceof Customer && o2 instanceof Customer){
             Customer cust1=(Customer) o1;
             Customer cust2=(Customer) o2;
             return -cust1.getCustomerName().compareTo(cust2.getCustomerName());
         }
         return 0;
     }
 }