day17/CollectionsDemo2.java

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/*替换，反转fillreplaceAllreverse*/import java.util.*;class CollectionsDemo2 {public static void sop(Object obj){System.out.println(obj);}public static void main(String[] args) {//fill();//replaceAll();reverse();}public static void fill(){List<String> list = new ArrayList<String>();list.add("cd");list.add("ab");list.add("mm");list.add("kkk");list.add("mm");sop(list);Collections.fill(list,"pp");//list集合中的元素全部替换成了"pp"sop(list);}public static void replaceAll(){List<String> list = new ArrayList<String>();list.add("cd");list.add("ab");list.add("mm");list.add("kkk");list.add("mm");sop(list);Collections.replaceAll(list,"mm","pp");//list集合中的全部元素"mm",全部替换成了"pp"sop(list);}public static void reverse(){List<String> list = new ArrayList<String>();list.add("cd");list.add("ab");list.add("mm");list.add("kkk");list.add("mm");sop(list);Collections.reverse(list);//list集合中的元素反转sop(list);}}

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