Re-call the constructor for an instance of an object inside an instance

Can I somehow call a constructor inside a method of the same class? Example:

public boolean add(E e) {
    .....
    if (this.size() > threshold) {
        this = this(5, 10); //Something like this, recreate yourself with other parameters
        System.gc();
    }
    return result;
}

//Constructor    
public Backed(int threshold, int slex) {
    super();
    this.threshold = threshold;
    this.slex = slex;
}

Maybe then somehow you can call super(); without a constructor through a method? That would help too

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