JAVA的可视化界面调用Graphics类

源代码：

package hu;import java.applet.*; import java.awt.*;public class Boy extends Applet{public void paint (Graphics g){g.setColor(Color.red);g.drawString("我一边喝咖啡，一边学java呢",5,30);g.setColor(Color.blue);g.drawString("我学的很认真",5,50);}}

package hu;import java.applet.*; import java.awt.*;public class Boy extends Applet{/** *  *///private static final long serialVersionUID = 1L;/** *  *///private static final long serialVersionUID = -5991863628806797002L;public void paint (Graphics g){g.setColor(Color.red);g.drawString("我一边喝咖啡，一边学java呢",5,30);g.setColor(Color.blue);g.drawString("我学的很认真",5,50);}}

生成结果：

//private static final long serialVersionUID = 1L;/** *  *///private static final long serialVersionUID = -5991863628806797002L;

这两句代码啥意思？