public Treemap center(Object val1, Object val2) {
        this.center = new Object[2];
        this.center[0] = val1;
        this.center[1] = val2;
        return this;
    }
public Treemap center ( Object val1 , Object val2 ) { this . center = new Object [ 2 ] ; this . center [ 0 ] = val1 ; this . center [ 1 ] = val2 ; return this ; }
设置val1,val2值

@param val1
@param val2