``` package com.shiyanlou.lxm; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; public class FileTest { public static void main(String[] args) throws IOException { FileInputStream fileInputStream = new FileInputStream("../../Desktop/aa.txt"); s int b = 0; while((b= fileInputStream.read())!=-1) { System.out.println(b); } } } ``` ``` package com.shiyanlou.lxm; import java.util.ArrayList; import java.util.List; public class GeneticArray{ private List list = new ArrayList(); public static void main(String[] args) { GeneticArray ga = new GeneticArray(); ga.put(0, "hello"); System.out.println(ga.get(0)); } public void put(int index,T item) { list.add(index, item); } public T get(int index) { return list.get(index); } } ``` *** ``` package com.shiyanlou.lxm; import java.util.ArrayList; import java.util.List; public class GeneticArray{ private List list = new ArrayList(); public static void main(String[] args) { GeneticArray ga = new GeneticArray(); ga.put(0, "hello"); System.out.println(ga.get(0)); } public void put(int index,T item) { list.add(index, item); } public T get(int index) { return list.get(index); } } ``` ``` package com.shiyanlou.lxm; public enum Week { MONDAY("MON"),TUESDAY("TUE"),WEDNESDAY("WED"),THURSDAY("THU"),FRIDAY("FRI"),SATURDAY("SAT"),SUNDAY("SUN"); private String abbr; private Week(String abbr)//must declare the constuctor in private rather then public and so on {this.abbr = abbr;} public String getAbbr() {return this.abbr;} public static void main(String[] args) { for(Week week:Week.values()) { System.out.println("The order of "+week+ "is "+week.ordinal()); System.out.println("Compare to MONDAY:"+week.compareTo(Week.MONDAY)); System.out.println("Equal to MONDAY?"+ week.equals(Week.MONDAY)); System.out.println("Equal to MONDAY by ==?"+(week==Week.MONDAY)); System.out.println("Name:"+week.name()); System.out.println("Abbreviation: "+week.getAbbr()); System.out.println("---------------------------"); } } } ``` ![](https://dn-simplecloud.qbox.me/5e1abad1d76442575332845766e56da3-wm) ![](https://dn-simplecloud.qbox.me/140cf9fb857bb3a82311214240906059-wm) ![](https://dn-simplecloud.qbox.me/e027e36d950b03e2989eae37df9b4c1b-wm)

“J2SE核心开发实战”实验报告