2021-10-11

public class Person {
    String gid;
    String cid;
    String name;
    String number;
    String gz;
    String gl;//构造参数；

    public Person(String gid, String cid, String name, String number, String gz, String gl) {
        this.gid = gid;
        this.cid = cid;
        this.name = name;
        this.number = number;
        this.gz = gz;
        this.gl = gl;
    }

    public String getGid() {
        return gid;
    }

    public void setGid(String gid) {
        this.gid = gid;
    }

    public String getCid() {
        return cid;
    }

    public void setCid(String cid) {
        this.cid = cid;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getNumber() {
        return number;
    }

    public void setNumber(String number) {
        this.number = number;
    }

    public String getGz() {
        return gz;
    }

    public void setGz(String gz) {
        this.gz = gz;
    }

    public String getGl() {
        return gl;
    }

    @Override
    public String toString() {
        return "Person{" +
                "gid='" + gid + ''' +
                ", cid='" + cid + ''' +
                ", name='" + name + ''' +
                ", number='" + number + ''' +
                ", gz='" + gz + ''' +
                ", gl='" + gl + ''' +
                '}';//qu
    }

    public void setGl(String gl) {
        this.gl = gl;
    }
}

import java.util.*;

public class Demo01 {
    public static void main(String[] args) {

        show01();

    }

    private static void show01() {
        Map> map1 = new HashMap<>();
        Map> map2 = new HashMap<>();
        Map> map3 = new HashMap<>();
        ArrayList arr = new ArrayList<>();
            Collections.addAll(arr, new Person("W1", "WS1", "Chisel", "13024390423", "special", "5"),
                new Person("W2", "WS1", "Asa", null, "expert", null),
                new Person("W3", "WS1", "Parker", "15754183291", "common", "1"),
                new Person("W4", "WS1", "Ron", "18283957359", "common", "0"),
                new Person("W5", "WS1", "Tyler", null, "common", "0"),
                new Person("W6", "WS1", "Tony", "17683934639", " common", "    0"),
                new Person("W7", "WS1", "August", null, "common", "0"),
                new Person("W8", "WS2", "Sam", "13186396347", "special", "5"));
        for (Person person : arr) {      //遍历数组
            if (map1.get(person.getCid()) == null) {
                map1.put(person.getCid(), new ArrayList());
            }
            map1.get(person.getCid()).add(person);
        }
        Set strings = map1.keySet();
        for (String string : strings) {
            System.out.println(string + map1.get(string));
        }

    }
}

运行结果