下大致相当于你的Perl代码。
List<Map<String,String>> mapList = new ArrayList<Map<String,String>>();
Map<String,String>> map1 = new HashMap<String,String>();
map1.put("food", "pizza");
Map<String,String>> map2 = new HashMap<String,String>();
map2.put("drink", "coke");
Collections.addAll(mapList, map1, map2);
...
for (Map<String,String> map : mapList) {
System.out.println("food is " + map.get("food"));
System.out.println("drink is " + map.get("drink"));
}
但是,正如您所看到的,这比Perl中的繁琐得多。这使我想到,在Java中使用自定义类而不是关联数组(例如Map
实例)来完成这种事情通常是更好的主意。然后,你可以这样写,就像这样:
List<Diet> dietList = new ArrayList<Diet>();
Collections.addAll(dietList, new Diet("pizza", null), new Diet(null, "coke");
...
for (Diet diet : dietList) {
System.out.println("food is " + diet.getFood());
System.out.println("drink is " + diet.getDrink());
}
这种方法(使用自定义类)通常更强劲,更高效,并为您提供更可读的代码。