遍历arraylistJava遍历集合,ArrayList统计集合中"def"字符串一共出现了多少个

Java遍历集合,ArrayList统计集合中"def"字符串一共出现了多少个

代码如下： package?tests; import?java.util.ArrayList; import?java.util.List; public?class?Main { ????public?static?void?main(String[]?args) ????{ ????????List<String>?list?=?new?ArrayList<>(); ????????list.add("def"); ????????list.add("def"); ????????list.add("bcdef"); ????????list.add("def"); ????????//?方法一 ????????t?=?0; ????????for(String?s?:?list) ????????????if(s.equals("def")) ???????????????t++; ????????System.out.println(&t?=?"?+t); ????????//?方法二 ????????t_2?=?list.stream().filter(s?->?s.equals("def")).count(); ????????System.out.println(&t_2?=?"?+t_2); ????} }打印结果： cnt = 3 cnt_2 = 3