Vector 多字段排序的Java实现

要求实现：

Vector 多字段排序，其中首元素不参与排序，第一二三字段升序，空排到前面。

//这里是Vector的元素定义
public class AVectorElement {

    private String sort_first_Field;
    private String sort_second_Field;
    private String sort_third_Field;
    /**
     * @return the sort_first_Field
     */
    public String getSort_first_Field() {
        return sort_first_Field;
    }
    /**
     * @param sort_first_Field the sort_first_Field to set
     */
    public void setSort_first_Field(String sort_first_Field) {
        this.sort_first_Field = sort_first_Field;
    }
    /**
     * @return the sort_second_Field
     */
    public String getSort_second_Field() {
        return sort_second_Field;
    }
    /**
     * @param sort_second_Field the sort_second_Field to set
     */
    public void setSort_second_Field(String sort_second_Field) {
        this.sort_second_Field = sort_second_Field;
    }
    /**
     * @return the sort_third_Field
     */
    public String getSort_third_Field() {
        return sort_third_Field;
    }
    /**
     * @param sort_third_Field the sort_third_Field to set
     */
    public void setSort_third_Field(String sort_third_Field) {
        this.sort_third_Field = sort_third_Field;
    }
}

排序实现

package jp.co.hitachi.jkk.zaimu.player.kr;

import java.util.Collections;
import java.util.Comparator;
import java.util.Vector;

public class AVectorSort {

    /**
     * @param args
     */
    public static void main(String[] args) {
        Vector<AVectorElement> vtElements = new Vector<AVectorElement>();
        InstoVt(vtElements);

        // sort before print all elements
        System.out.println("Sort Before:");
        pfVtAllElement(vtElements);

        AVectorElement bkE = vtElements.firstElement();
        vtElements.removeElementAt(0);
        if (bkE == null) {
            System.out.println("null!");
            return;
        }
        Collections.sort(vtElements, new Comparator<AVectorElement>() {

            public int compare(AVectorElement ev1, AVectorElement ev2) {

                String[][] arrStr = new String[2][3];

                arrStr[0][0] = convertNullToEmpty(ev1.getSort_first_Field());
                arrStr[1][0] = convertNullToEmpty(ev2.getSort_first_Field());

                arrStr[0][1] = convertNullToEmpty(ev1.getSort_second_Field());
                arrStr[1][1] = convertNullToEmpty(ev2.getSort_second_Field());

                arrStr[0][2] = convertNullToEmpty(ev1.getSort_third_Field());
                arrStr[1][2] = convertNullToEmpty(ev2.getSort_third_Field());

                if (arrStr[0][0].compareTo(arrStr[1][0]) > 0) {
                    return 1;
                } else if (arrStr[0][0].compareTo(arrStr[1][0]) < 0) {
                    return -1;

                } else if (arrStr[0][1].compareTo(arrStr[1][1]) > 0) {
                    return 1;
                } else if (arrStr[0][1].compareTo(arrStr[1][1]) < 0) {
                    return -1;

                } else if (arrStr[0][2].compareTo(arrStr[1][2]) > 0) {
                    return 1;
                } else if (arrStr[0][2].compareTo(arrStr[1][2]) < 0) {
                    return -1;
                }

                return 0;
            }
        });
        // add first element backuped before sort
        System.out.println("Sort After:");
        vtElements.add(0, bkE);
        // sort after ,print all elements
        pfVtAllElement(vtElements);
    }

    private static void InstoVt(Vector<AVectorElement> vtElements) {
        AVectorElement e = null;
        // first element is exclude
        e = new AVectorElement();
        e.setSort_first_Field("2029");
        e.setSort_second_Field("1-070-000");
        e.setSort_third_Field("1-070-000");
        vtElements.add(e);

        e = new AVectorElement();
        e.setSort_first_Field("2001");
        e.setSort_second_Field("1-070-000");
        e.setSort_third_Field("1-070-000");
        vtElements.add(e);

        e = new AVectorElement();
        e.setSort_first_Field("1001");
        e.setSort_second_Field("1-070-000");
        e.setSort_third_Field("1-070-000");
        vtElements.add(e);

        e = new AVectorElement();
        e.setSort_first_Field("1003");
        e.setSort_second_Field("1-070-000");
        e.setSort_third_Field("1-070-000");
        vtElements.add(e);

        e = new AVectorElement();
        e.setSort_first_Field("1002");
        e.setSort_second_Field("1-080-000");
        e.setSort_third_Field("1-070-000");
        vtElements.add(e);

        e = new AVectorElement();
        e.setSort_first_Field("1002");
        e.setSort_second_Field("1-080-000");
        e.setSort_third_Field("1-060-000");
        vtElements.add(e);

        e = new AVectorElement();
        e.setSort_first_Field("1002");
        e.setSort_second_Field("1-070-000");
        e.setSort_third_Field("1-070-000");
        vtElements.add(e);

        e = new AVectorElement();
        e.setSort_first_Field("");
        e.setSort_second_Field("1-080-000");
        e.setSort_third_Field("1-060-000");
        vtElements.add(e);

        e = new AVectorElement();
        e.setSort_first_Field("");
        e.setSort_second_Field("");
        e.setSort_third_Field("1-060-000");
        vtElements.add(e);

        e = new AVectorElement();
        e.setSort_first_Field("");
        e.setSort_second_Field("");
        e.setSort_third_Field("");
        vtElements.add(e);

        e = new AVectorElement();
        e.setSort_first_Field("");
        e.setSort_second_Field("2-100-100");
        e.setSort_third_Field("");
        vtElements.add(e);
    }

    private static void pfVtAllElement(Vector<AVectorElement> vtElements) {
        for (AVectorElement e : vtElements) {
            System.out.println("Field1: " + e.getSort_first_Field() + ",  Field2:"
                    + e.getSort_second_Field() + ",  Field1:" + e.getSort_third_Field() + ".");
        }
    }

    private static String convertNullToEmpty(String aString) {
        String ret = null;
        try {
            if (aString == null) {
                return "";
            }
            return aString;

        } catch (Exception e) {
            ret = null;
            return ret;
        }
    }
}

排序结果：

Sort Before:
Field1: 2029,  Field2:1-070-000,  Field1:1-070-000.
Field1: 2001,  Field2:1-070-000,  Field1:1-070-000.
Field1: 1001,  Field2:1-070-000,  Field1:1-070-000.
Field1: 1003,  Field2:1-070-000,  Field1:1-070-000.
Field1: 1002,  Field2:1-080-000,  Field1:1-070-000.
Field1: 1002,  Field2:1-080-000,  Field1:1-060-000.
Field1: 1002,  Field2:1-070-000,  Field1:1-070-000.
Field1: ,  Field2:1-080-000,  Field1:1-060-000.
Field1: ,  Field2:,  Field1:1-060-000.
Field1: ,  Field2:,  Field1:.
Field1: ,  Field2:2-100-100,  Field1:.
Sort After:
Field1: 2029,  Field2:1-070-000,  Field1:1-070-000.（首元素不参与排序）
Field1: ,  Field2:,  Field1:.
Field1: ,  Field2:,  Field1:1-060-000.
Field1: ,  Field2:1-080-000,  Field1:1-060-000.
Field1: ,  Field2:2-100-100,  Field1:.
Field1: 1001,  Field2:1-070-000,  Field1:1-070-000.
Field1: 1002,  Field2:1-070-000,  Field1:1-070-000.
Field1: 1002,  Field2:1-080-000,  Field1:1-060-000.
Field1: 1002,  Field2:1-080-000,  Field1:1-070-000.
Field1: 1003,  Field2:1-070-000,  Field1:1-070-000.
Field1: 2001,  Field2:1-070-000,  Field1:1-070-000.