java处理脏数据,Java程序的脏数据问题

脏数据(Out-of-date data)，指过时的数据。

Fragment 1. 缓存技术的脏数据问题

/**

* A report PRinter is used to print a report.

*

* @version 1.0 9/9/2003

* @author Bill

*/

public class ReportPrinter {

/**

* ConstrUCts a instance.

*/

public ReportPrinter() {

// do something…

}

/**

* Prints a printable.

*

* @param printable the specified printable object

*/

public void print(Printable printable) {

Graphics g = getGraphics();

g.setFont(getReportFont(printable.getFont());

printable.print(g);

}

/**

* Returns the corresponding report font of a java font.

*

* @param javaFont the specified java font

* @return the corresponding report font

*/

private Font getReportFont(font javaFont) {

Font reportFont = fontMap.get(javaFont);

if(reportFont == null) {

reportFont = loadFont(javaFont);

fontMap.put(javaFont, reportFont);

}

return reportFont;

}

/**

* Loads the corresponding report font of a java font.

*

* @param javaFont the specified java font

* @param the corresponding report font

*/

protected static Font loadFont(Font javaFont) {

Font reportFont = null;

文章知识点与官方知识档案匹配，可进一步学习相关知识Java技能树首页概览93916 人正在系统学习中 相关资源：phantomjs-dirty:PhantomJS的脏兼容键值数据库-其它代码类资源…