下面介紹兩種方法:方法一:將HashSet轉換為List,然後使用Collections.sort()進行排序方法二:將將Hashset轉換為TreeSet下面是兩種方法的代碼: 代碼如下複製代碼 public class HashSetSortingDemo{ public static void main(String args[]) {
應該這樣檢查你的環境和你的操作:1、你的檔案名稱對嗎?JAVA要求你的檔案和你的類名嚴格對應的。比如 public class HelloWorld{ .....那麼檔案名稱一定只能是HelloWorld.java,看仔細了!2、你的程式中有main方法嗎?參數什麼的對嗎?main方法的聲明應該是這樣子的:public static void main(String[] args) 事實上如果你用開發工具來做的話,是不會錯的。如果你用UltraEdit之類的來寫程式的話,就一個字不要改的照抄吧!
源碼如下import java.util.*;public class ShowDate {public static void main(String[] args) {Calendar calendar = new GregorianCalendar();Date trialTime = new Date();calendar.setTime(trialTime);// print out a bunch of interesting
Good Java Style: Part 2By Thornton Rose IntroductionThis is the conclusion of a two-part series on Java coding style. In Good Java Style: Part 1 , I introduced my case for writing Java code using good habits, explained why we should care about the
//: c03:Assignment.java// Assignment with objects is a bit tricky.// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002// www.BruceEckel.com. See copyright notice in CopyRight.txt.// edit by nx.class Number { int i;}public class