將Java列表轉換為對象

Question

我必須將包含一些字符串的列表轉換為java對象，這是列表：

[099882, 11, 6, 0, 25]

該列表的每個位置代表一個Java類中的一個字段，這是該類：

public class Chunks extends BaseModel {
    private static final long serialVersionUID = 1494042139468968199L;

    private String field1;
    private String field2;
    private String field3;
    private String field4;
    private String field5;

    public Chunks(String field1, String field2, String field3, String field4, String field5) {
         this.field1 = field1;
         this.field2 = field2;
         this.field3 = field3;
         this.field4 = field4;
         this.field5 = field5;
    }   

}

我像這樣填寫清單：

private static void splitFile(Path path){
    int[] fileSplits = {6,2,1,1,2};
    int total = 0;

    List<String> stringList = new ArrayList<String>();
    for (int i = 0 ; i < fileSplits.length ; i++) {
        stringList.add(path.toString().substring(total, total+=fileSplits[i]));
    }

    // Have to transform the list just right here !!!
    //      and then..
    //          dbInsert(convertedObject);
}

任何想法？

Answer 1

也許您可以在構造函數的簽名中使用數組，而不是列出所有字段：

public class Chunk{
    private static final long serialVersionUID = 1494042139468968199L;

    private String field1;
    private String field2;
    private String field3;
    private String field4;
    private String field5;

    public Chunk(String[] fields) {
         this.field1 = fields[0];
         this.field2 = fields[1];
         this.field3 = fields[2];
         this.field4 = fields[3];
         this.field5 = fields[4];
    } 
}

您甚至可以使用數組來保存Chunk的字段：

public Chunk(String[] fields) {
        this.fields = fields;
    } 

無論哪種方式，另一段代碼都只需要向Chunk的構造函數提供字符串數組即可：int [] fileSplits = {6,2,1,1,2}; int total = 0;

    String[] stringList = new String[fileSplits.length];
    for (int i = 0 ; i < fileSplits.length ; i++) {
       stringList = path.toString().substring(total, total+=fileSplits[i]);
    }

    Chunk chunk = new Chunk(stringList);

您當然應該添加一些驗證，以確保在Chunk的構造函數中不會引發ArrayOutOfBoundException。

public Chunk(String[] fields) {
    if(fields==null || fields.length<5){
        throw new SomeException();
    }
    this.field1 = fields[0];
    this.field2 = fields[1];
    this.field3 = fields[2];
    this.field4 = fields[3];
    this.field5 = fields[4];
}