import org.junit.Test;
import java.lang.reflect.Field;
import java.util.*;

public class TestArrayList {
	@Test
	public void testOverrideEquals() {
	        List<User> list = new ArrayList<User>();
	        User u1 = new User("3", "小强", "4");
	        User u2 = new User("4", "小强", 21);
	        User u3 = new User("4", "小强1", 21);
	        User u4 = new User("4", "小强1", "2");
	        list.add(u1);
	        list.add(u2);
	        list.add(u3);
	        list.add(u4);
	        Map<User, List<User>> map = new HashMap<>();
	        for (User user : list) {
	            List<User> listmap = map.get(user);
	            if (listmap == null) {
	                listmap = new ArrayList<>();
	            }
	            listmap.add(user);
	            map.put(user, listmap);
	        }
	        System.out.println(map);
	        ArrayList<Object> newLists = new ArrayList<>();
	        for (Map.Entry<User, List<User>> m : map.entrySet()) {
	            List<User> users = m.getValue();
	            User temp = new User();
	            for (User user : users) {
	                Class<? extends User> userClass = user.getClass();
	                Class<? extends User> tempClass = temp.getClass();
	                Field[] fields = userClass.getDeclaredFields();
	                for (Field field : fields) {
	                    field.setAccessible(true);
	                    try {
	                        Object value = field.get(user);
	                        boolean result = isResult(value);
	                        if (result) {
	                            Field tempClassField = tempClass.getDeclaredField(field.getName());
	                            tempClassField.setAccessible(true);
	                            tempClassField.set(temp, value);
	                        }
	                    } catch (IllegalAccessException | NoSuchFieldException e) {
	                        e.printStackTrace();
	                    }
	                }
	            }
	            newLists.add(temp);
	        }
	        System.out.println(newLists);
	    }
	
	    private boolean isResult(Object value) {
	        boolean result = false;
	        if (value != null) {
	            if (value instanceof Integer) {
	                if (Integer.parseInt(value.toString()) != 0) {
	                    result = true;
	                }
	            } else {
	                result = true;
	            }
	        }
	        return result;
	    }
    }

实体类

import org.apache.commons.lang3.StringUtils;

/**
 * .
 *
 * @Author Chenglin Zhu
 * @Date 2021/4/15 20:49
 */
public class User {
    private String id;
    private String name;
    private int age;
    private String nation;

    public User(){

    }

    public User(String id, String name, int age, String nation) {
        this.id = id;
        this.name = name;
        this.age = age;
        this.nation = nation;
    }

    public User(String id, String name, int age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }

    public User(String id, String name, String nation) {
        this.id = id;
        this.name = name;
        this.nation = nation;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

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


    public String getNation() {
        return nation;
    }

    public void setNation(String nation) {
        this.nation = nation;
    }

    @Override
    public String toString() {
        return "User{" +
                "id='" + id + ''' +
                ", name='" + name + ''' +
                ", age=" + age +
                ", nation='" + nation + ''' +
                '}';
    }

    @Override
    public boolean equals(Object obj) {
        if(this == obj){
            return true;//地址相等
        }

        if(obj == null){
            return false;//非空性：对于任意非空引用x，x.equals(null)应该返回false。
        }

        if(obj instanceof User){
            User other = (User) obj;
            //需要比较的字段相等，则这两个对象相等
            if(equalsStr(this.name, other.name)){
                return true;
            }
        }

        return false;
    }

    private boolean equalsStr(String str1, String str2){
        if(StringUtils.isEmpty(str1) && StringUtils.isEmpty(str2)){
            return true;
        }
        if(!StringUtils.isEmpty(str1) && str1.equals(str2)){
            return true;
        }
        return false;
    }

    @Override
    public int hashCode() {
        int result = 17;
        result = 31 * result + (name == null ? 0 : name.hashCode());
        return result;
    }
}

最后

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