JAVA Collections常用方法__JAVA

//僅作為學習筆記

/*集合架構的工具類Collections：*/import java.util.*;class Test{public static void main(String [] args){List<String> ls = new ArrayList<String>();ls.add("aaa");ls.add("afs");ls.add("fds");ls.add("bcd");sop(ls);Collections.sort(ls);sop(ls);String tmp = Collections.max(ls);sop("max :"+tmp);int index = Collections.binarySearch(ls,"bcd");sop("index :" + index);int index2 = Collections.binarySearch(ls,"bcde");sop("index2 :" + index2);//如果搜尋鍵包含在列表中，則返回搜尋鍵的索引；否則返回 (-(插入點) - 1)//替換 Collections.replaceAll(ls, "afs","KK");sop(ls);//反轉，逆置Collections.reverse(ls);sop(ls);//fill 方法可以將list集合中所有元素轉換成指定元素Collections.fill(ls,"pp");sop(ls);}public static void sop(Object obj){System.out.println(obj);}}