public BasicHttpParams() 
{
        super();
}

 public  void clear() 
{
        this.parameters.clear();
}

Removes all parameters from this collection.

 public Object clone() throws CloneNotSupportedException 
{
        BasicHttpParams clone = (BasicHttpParams) super.clone();
        copyParams(clone);
        return clone;
}

 public HttpParams copy() 
{
        BasicHttpParams clone = new BasicHttpParams();
        copyParams(clone);
        return clone;
}

Creates a copy of these parameters. The implementation here instantiates BasicHttpParams , then calls #copyParams(HttpParams) to populate the copy.

 protected  void copyParams(HttpParams target) 
{
        Iterator iter = parameters.entrySet().iterator();
        while (iter.hasNext()) {
            Map.Entry me = (Map.Entry) iter.next();
            if (me.getKey() instanceof String)
                target.setParameter((String)me.getKey(), me.getValue());
        }
}

Copies the locally defined parameters to the argument parameters. This method is called from #copy() .

 public Object getParameter(String name) 
{
        return this.parameters.get(name);
}

 public boolean isParameterSet(String name) 
{
        return getParameter(name) != null;
}

Is the parameter set?

Uses #getParameter(String) (which is overrideable) to fetch the parameter value, if any.

Also @see #isParameterSetLocally(String)

 public boolean isParameterSetLocally(String name) 
{
        return this.parameters.get(name) != null;
}

Is the parameter set in this object?

The parameter value is fetched directly.

Also @see #isParameterSet(String)

 public boolean removeParameter(String name) 
{
        //this is to avoid the case in which the key has a null value
        if (this.parameters.containsKey(name)) {
            this.parameters.remove(name);
            return true;
        } else {
            return false;
        }
}

 public HttpParams setParameter(String name,
    Object value) 
{
        this.parameters.put(name, value);
        return this;
}

 public  void setParameters(String[] names,
    Object value) 
{
        for (int i = 0; i <  names.length; i++) {
            setParameter(names[i], value);
        }
}

Assigns the value to all the parameter with the given names