在Java中将列表的变量值设置为另一个列表变量值

Question

这是我的津贴班

public class Allowance {
    private String Id;
    private String Name;
    private String Type;
    private String RemainingAmount;
    private String TotalAmount;
}

这是创建列表

public List<Allowance> getBList(){
    List<Allowance> BList = new ArrayList<>();
    List.add(new Allowance("5964852","Name1","DATA","10","458965"));
    List.add(new Allowance("651655","Name2","DATA","20","5481662"));
    List.add(new Allowance("123","Name3","VOICE","30","8889625"));
    List.add(new Allowance("123423","Name4","DATA","20","325489"));
    return BList;
}

这是我的福利课

public class Benefits {
    private String itemId;
    private String bName;
    private String remaining;
    private String bTotal;
}

因此，我希望将Allowance类变量值设置为如下所示的福利类变量值

Id值-> itemId值

名称值-> bName值

RemainingAmount值->剩余值

TotalAmount值-> bTotal值

那么我想要像这样退回福利清单

["itemId" : "5964852","bName": "Name1","remaining":"10","bTotal":"458965"]

有人能帮我吗？

Answer 1

您可以使用单个arg构造函数从Allowance实例中传递值，然后从传入的Allowance实例中that福利类的属性。还可以重写效益类的toString方法以获得所需的输出。“津贴”类中的克隆方法将接受您为返回福利实例列表而创建的列表。

津贴类别：

class Allowance {
    private String Id;
    private String Name;
    private String Type;
    private String RemainingAmount;
    private String TotalAmount;

    public String getId() {
        return Id;
    }

    public String getName() {
        return Name;
    }

    public String getType() {
        return Type;
    }

    public String getRemainingAmount() {
        return RemainingAmount;
    }

    public String getTotalAmount() {
        return TotalAmount;
    }

    public Allowance(String id, String name, String type, String remainingAmount, String totalAmount) {
        Id = id;
        Name = name;
        Type = type;
        RemainingAmount = remainingAmount;
        TotalAmount = totalAmount;
    }

public List<Benefits> clone(List<Allowance> allowanceList){
        
        List<Benefits> benefitList = new ArrayList<>();
        for(Allowance allowance : allowanceList){
            benefitList.add(new Benefits(allowance));
        }
        
        return benefitList;
    }
}

福利类别：

class Benefits{

    private String itemId;
    private String bName;
    private String remaining;
    private String bTotal;

    public Benefits(Allowance allowance){

        this.itemId = allowance.getId();
        this.bName = allowance.getName();
        this.remaining = allowance.getRemainingAmount();
        this.bTotal = allowance.getTotalAmount();

    }

    @Override
    public String toString() {
        return "[ itemId : " + this.itemId + ", bName : " + this.bName + ", remaining : " + this.remaining + ", bTotal :" + this.bTotal + "]";
    }
}

要创建福利项目列表，还可以直接创建以下列表：

      List<Benefits> bList = new ArrayList<>();

        Allowance a = new Allowance("5964852","Name1","DATA","10","458965");
        Allowance b = new Allowance("651655","Name2","DATA","20","5481662");
        Allowance c =  new Allowance("123","Name3","VOICE","30","8889625");
        Allowance d = new Allowance("123423","Name4","DATA","20","325489");

        bList.add(new Benefits(a));
        bList.add(new Benefits(b));
        bList.add(new Benefits(c));
        bList.add(new Benefits(d));

Answer 2

使用流和lambda是很容易实现的。

List<Allowance> AList = BList.stream().map(B -> {
    new Allowance(
        B.getId(),
        B.getName(),
        B.getRemainingAmount(),
        B.bTotal())
}).collect(Collectors.toList())

Answer 3

因此，根据我在对你最初问题的答复中所读到的，你会寻找一些类似的东西；

1. 您需要为Allowance.

的所有属性创建getter。

然后，

1. 创建一个构造函数，该构造函数以Allowance对象作为参数。

公共福利(津贴a) { this.itemId = a.getID；this.bName = a.getName；this.remaning = a.getRemainingAmount；this.bTotal = a.getTotalAmount；}