将对象数组添加到数组列表中，并根据一个属性值与其他数组列表进行比较并过滤结果

Question

将对象数组添加到数组列表中，并根据一个属性值与其他数组列表进行比较并过滤结果。

我有一组对象 personDetails 和 departmentDetails。

package com.education;

import java.util.*;

 public class educationMain {

 public static void main(String[] args) {
    
    List<person> list=new ArrayList<person>();  
    person l1 = new person(1,"Samual",100,"Sales","Business");
    person l2 = new person(2,"Alex",100,"Sales","Business");
    person l3 = new person(3,"Bob",101,"Engineering","Technology");
    person l4 = new person(4,"Michel",101,"Engineering","Technology");
    person l5 = new person(5,"Ryan",102,"PR","Services");
    person l6 = new person(6,"Horward",103,"Leadership","Managmnet");
    person l7 = new person(7,"Cyna",104,"HR","Human Resource");
    list.add(l1);  
    list.add(l2);  
    list.add(l3); 
    list.add(l4);  
    list.add(l5);  
    list.add(l6); 
    list.add(l7); 
    
     for(person b:list){  
            System.out.println(b.personId+" "+b.name+" "+b.deptCode+" "+b.parentDept+" "+b.deptName);  
     }  
     
     
     List<department> depList = new ArrayList<department>();
     
     department d1 = new department(100, "Sales","Business");
     department d2 = new department(101, "Engineering","Technology");
     department d3 = new department(102, "PR","Services");
     depList.add(d1);  
     depList.add(d2);  
     depList.add(d3); 

     for(department b:depList){  
            System.out.println(b.deptCode+" "+b.parentDept+" "+b.deptName);  
     }
}

}

所以上面的代码工作正常并且显示正确。

我的人class

包 com.education;

public class person {
    public int personId;
    public String name;
    private int deptCode;
    private String parentDept;
    private String deptName;
    
    public person(int personId, String name, int deptCode, String parentDept, String deptName) {
        super();
        this.personId = personId;
        this.name = name;
        this.deptCode = deptCode;
        this.parentDept = parentDept;
        this.deptName = deptName;
    }
    
    public void display(){
         System.out.println(" " + personId + " " +name + " " + deptCode+ " " + parentDept + " "+deptName);
         System.out.println();
    }
    
}

我的部门class

public class department {
    
    private int deptCode;
    private String parentDept;
    private String deptName;
    public department(int deptCode, String parentDept, String deptName) {
        super();
        this.deptCode = deptCode;
        this.parentDept = parentDept;
        this.deptName = deptName;
    }
    
    public void dispalyDepartment() {
        System.out.println(" "+deptCode+" "+parentDept+" "+deptName);
    }

}

现在我的目标是将 personDetails 和 departmentDetails 放入数组列表中并进行比较，然后根据部门代码找出差异。

这是我的逻辑：工作正常。

List<person> listC = new ArrayList<person>();
         
         
         for(person p : list) {
             boolean  flag = false;
             for (department d:depList) {
                 if(p.deptCode == d.deptCode) {
                     flag = false;
                     break;
                 }else {
                     flag = true;
                 }
             }
             if(flag == true) {
                 listC.add(p);
             }
         }

o/p应该是

    (6,"Horward",103,"Leadership","Managmnet");
    (7,"Cyna",104,"HR","Human Resource");

因为 deptCode : 103 和 104 不存在。

谁能帮帮我。我可以使用任何其他收集技术吗？

Answer 1

试试这个。

    Set<Integer> deptCodes = Arrays.stream(departmentDetails)
        .map(department -> department.deptCode)
        .collect(Collectors.toSet());
    List<person> persons = Arrays.stream(personDetails)
        .filter(person -> !deptCodes.contains(person.deptCode))
        .collect(Collectors.toList());
    persons.forEach(person -> person.display());

输出：

 6 Horward 103 Leadership Managmnet

 7 Cyna 104 HR Human Resource

将对象数组添加到数组列表中，并根据一个属性值与其他数组列表进行比较并过滤结果

Adding array of object into array list and compare with other array list based on one property value and filter the result

java

collections

arraylist

将对象数组添加到数组列表中，并根据一个 属性 值与其他数组列表进行比较并过滤结果

Adding array of object into array list and compare with other array list based on one property value and filter the result

java

collections

arraylist

将对象数组添加到数组列表中，并根据一个属性值与其他数组列表进行比较并过滤结果