ixiyang

比喻很形象


Please note that the methods in Listing 1-10 are internal methods and are not part of the 
public API, so they may change with newer releases. However, the underlying protocol would remain 
the same.
In Listing 1-10, it is easier to first tell what forceLayout( ) is. It is like a touch command in build 
environments. Usually when a file hasn’t changed, the build dependencies will ignore it. So, you 
force that file to be compiled by “touch”ing, and thereby updating its time stamp. Just like touch, 
the forceLayout( ) will not invoke any build commands by itself (unless your build environment is too