Method setLen

chapter21/src/main/java/com/seaofnodes/simple/Ary.java:126–134

( int len )

    }

    public Ary<E> setLen( int len ) {
        if( len > _len )
            while( len>= _es.length ) _es = Arrays.copyOf(_es,_es.length<<1);
        _len = len;
        while( _es.length > (len<<1) ) // Shrink if hugely too large
            _es = Arrays.copyOf(_es,_es.length>>1);
        Arrays.fill(_es,len,_es.length,null);
        return this;
    }

    public E swap( int i, int j ) {
        range_check(i);