java Collections.sort()实现List排序自定义方法

Posted 2020-08-26 求知若渴 虚心若愚

方法一：

package testSimple;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class testCollectionSort {
    public static void main(String[] args) {
        List<TblPowerGroup> list = new ArrayList<TblPowerGroup>();
        list.add(new TblPowerGroup("100001", "cxx1"));
        list.add(new TblPowerGroup("100002", "cxx2"));
        list.add(new TblPowerGroup("100003", "cxx6"));
        list.add(new TblPowerGroup("100003", "cxx5"));
        list.add(new TblPowerGroup("100004", "cxx5"));
        list.add(new TblPowerGroup("100004", "cxx6"));
        Collections.sort(list, new Comparator<TblPowerGroup>() {

            @Override
            public int compare(TblPowerGroup o1, TblPowerGroup o2) {
                if (o1.getGroupSn().compareTo(o2.getGroupSn()) == 0) {
                    return o1.getNodeName().compareTo(o2.getNodeName());
                } else {
                    return o1.getGroupSn().compareTo(o2.getGroupSn());
                }
            }

        });
        System.out.println(list);
    }
}

class TblPowerGroup {
    private String groupSn;
    private String nodeName;

    public TblPowerGroup(String groupSn, String nodeName) {
        super();
        this.groupSn = groupSn;
        this.nodeName = nodeName;
    }

    public String getGroupSn() {
        return groupSn;
    }

    public void setGroupSn(String groupSn) {
        this.groupSn = groupSn;
    }

    public String getNodeName() {
        return nodeName;
    }

    public void setNodeName(String nodeName) {
        this.nodeName = nodeName;
    }

    @Override
    public String toString() {
        return "TblPowerGroup [groupSn=" + groupSn + ", nodeName=" + nodeName
                + "]";
    }

}

 

方法二：

package testSimple;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class testCollectionSort2 {
    public static void main(String[] args) {
        List<TblPowerGroup> list = new ArrayList<TblPowerGroup>();
        list.add(new TblPowerGroup("100001", "cxx1"));
        list.add(new TblPowerGroup("100002", "cxx2"));
        list.add(new TblPowerGroup("100003", "cxx6"));
        list.add(new TblPowerGroup("100003", "cxx5"));
        list.add(new TblPowerGroup("100004", "cxx5"));
        list.add(new TblPowerGroup("100004", "cxx6"));
        Collections.sort(list, new TblPowerGroupSort());
        System.out.println(list);
    }

    private static class TblPowerGroupSort implements Comparator<TblPowerGroup> {

        @Override
        public int compare(TblPowerGroup o1, TblPowerGroup o2) {
            if (o1.getGroupSn().compareTo(o2.getGroupSn()) == 0) {
                return o1.getNodeName().compareTo(o2.getNodeName());
            } else {
                return o1.getGroupSn().compareTo(o2.getGroupSn());
            }
        }

    }
}