Question

I have a java class as follows:

public class Query implements Serializable {
    static Object[] o= new Object[8];

    private long oid= (Long) o[0];
    private double[] region= { (Double) o[1],(Double) o[2],(Double) o[3]  };
    private boolean filter= (Boolean) o[4];
    private float[] vel= {(Float) o[5], (Float) o[6]};
    private float[] pos= {(Float) o[7], (Float) o[8]};

    public Query(Object[] b){
        o=b;
    }

Class Query will be an array of objects and I want to establish dependency between Object[] o and oid, region,…

If I change region’s value, the corresponding value in object[] will be changed automatically.

Could you suggest me some way to do it efficiently. Thanks!

Answer 1

You need to wrap all primitive/immutable types in a mutable type so that you can just reference it. Using a Javabean is a common approach for this.

public class Data {
    private long id;
    private double[] region;
    private boolean filter;
    private float[] vel;
    private float[] pos;

    // Add or generate c'tors/getters/setters/equals/hashcode/tostring here.
}

So that you can just do

public class Query {
    private Data data;

    public Query(Data data) {
        this.data = data;
    }
}