对象排序

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排序实现类：

package test;import java.lang.reflect.Field;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;import java.util.Collections;import java.util.Comparator;import java.util.List;public class SortList<T> {  public void Sort(List<T> list, final String sortName, final String sort) {    Collections.sort(list, new Comparator<T>() {      @Override      public int compare(T o1, T o2) {        int ret = 0;        try {          String method = "get" + sortName.substring(0, 1).toUpperCase() + sortName.substring(1);          Method m1 = o1.getClass().getMethod(method, null);          Method m2 = o1.getClass().getMethod(method, null);          // 降序排          if (sort != null && SortEnum.SORT_DESC.getValue().equals(sort)) {            ret = m2.invoke(o2, null).toString().compareTo(m1.invoke(o1, null).toString());          }          // 升序排          else {            ret = m1.invoke(o1, null).toString().compareTo(m2.invoke(o2, null).toString());          }        }        catch (NoSuchMethodException e) {          e.printStackTrace();        }        catch (SecurityException e) {          e.printStackTrace();        }        catch (IllegalAccessException e) {          e.printStackTrace();        }        catch (IllegalArgumentException e) {          e.printStackTrace();        }        catch (InvocationTargetException e) {          e.printStackTrace();        }        return ret;      }    });  }}

Employee类

package test;import java.util.Date;public class Employee {  private Integer name;  private String clazz;  private Integer year;  private Integer month;  private Integer day;  private double salary;  public Employee() {  };  public Employee(Integer name, String clazz, Integer year, Integer month, Integer day,      double salary) {    super();    this.name = name;    this.clazz = clazz;    this.year = year;    this.month = month;    this.day = day;    this.salary = salary;  }  /**   * @return name   */  public Integer getName() {    return name;  }  /**   * @return year   */  public Integer getYear() {    return year;  }  /**   * @return month   */  public Integer getMonth() {    return month;  }  /**   * @return day   */  public Integer getDay() {    return day;  }  /**   * @return salary   */  public double getSalary() {    return salary;  }  /**   * @param name   *        set name   */  public void setName(Integer name) {    this.name = name;  }  /**   * @param year   *        set year   */  public void setYear(Integer year) {    this.year = year;  }  /**   * @param month   *        set month   */  public void setMonth(Integer month) {    this.month = month;  }  /**   * @param day   *        set day   */  public void setDay(Integer day) {    this.day = day;  }  /**   * @param salary   *        set salary   */  public void setSalary(double salary) {    this.salary = salary;  }  /**   * @return clazz   */  public String getClazz() {    return clazz;  }  /**   * @param clazz   *        set clazz   */  public void setClazz(String clazz) {    this.clazz = clazz;  }  @Override  public String toString() {    return "Employee [name=" + name + ", clazz=" + clazz + ", year=" + year + ", month=" + month        + ", day=" + day + ", salary=" + salary + "]";  }}

枚举

package test;/** * 排序类型枚举 *  * @author user */public enum SortEnum {  /**   * 降序   **/  SORT_DESC("desc"),  /**   * 升序   */  SORT_ASC("asc");  private String value;  SortEnum(String value) {    this.value=value;  }  /**   * @return value   */  public String getValue() {    return value;  }}

测试类

package test;import java.util.ArrayList;import java.util.Calendar;import java.util.Collections;import java.util.Date;import java.util.GregorianCalendar;import java.util.HashMap;import java.util.Iterator;import java.util.List;import java.util.Map;public class ComparatorTest {  public static void main(String[] args) {    Employee staff11 = new Employee(11, "1group", 1200, 1990, 12, 25);    Employee staff12 = new Employee(12, "1group", 1300, 1991, 12, 26);    Employee staff13 = new Employee(13, "1group", 1400, 1992, 12, 27);    Employee staff21 = new Employee(21, "2group", 2200, 1993, 12, 25);    Employee staff22 = new Employee(22, "2group", 2300, 1994, 12, 26);    Employee staff23 = new Employee(23, "2group", 2400, 1995, 12, 27);    Employee staff31 = new Employee(31, "3group", 3200, 1996, 12, 25);    Employee staff32 = new Employee(32, "3group", 3300, 1997, 12, 26);    Employee staff33 = new Employee(33, "3group", 3400, 1998, 12, 27);    List<Employee> staffs = new ArrayList<Employee>();    staffs.add(staff11);    staffs.add(staff12);    staffs.add(staff13);    staffs.add(staff21);    staffs.add(staff22);    staffs.add(staff23);    staffs.add(staff31);    staffs.add(staff32);    staffs.add(staff33);    SortList<Employee> sortList = new SortList<Employee>();    sortList.Sort(staffs, "clazz", SortEnum.SORT_DESC.getValue());    for (Employee employee : staffs) {      System.out.println(employee);    }  }}

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