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¡¡¡¡1.¶ÔcollectionsµÄÖ§³Ö
¡¡¡¡Java´úÂë 
List<String> list = new ArrayList<String>();  
list.add("item");  
String item = list.get(0);  
  
Set<String> set = new HashSet<String>();  
set.add("item");  
  
Map<String, Integer> map = new HashMap<String, Integer>();  
map.put("key", 1);  
int value = map.get("key");  
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¡¡¡¡Java´úÂë 
List<String> list = ["item"];  
String item = list[0];  
  
Set<String> set = {"item"};  
  
Map<String, Integer> map = {"key" : 1};  
int value = map["key"];  
¡¡¡¡2.×Ô¶¯×ÊÔ´¹ÜÀí
¡¡¡¡Java´úÂë 
BufferedReader br = new BufferedReader(new FileReader(path));  
try {  
   return br.readLine();  
} finally {  
   br.close();  
}  
¡¡¡¡becomes:
¡¡¡¡Java´úÂë 
try (BufferedReader br = new BufferedReader(new FileReader(path)) {  
   return br.readLine();  
}  
  
You can declare more than one resource to close:  
  
try (  
   InputStream in = new FileInputStream(src);  
   OutputStream out = new FileOutputStream(dest))  
{  
// code  
}  
¡¡¡¡3.¶ÔͨÓÃʵÀý´´½¨(diamond)µÄtypeÒýÓýøÐÐÁ˸Ľø
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Map<String, List<String>> anagrams = new HashMap<String, List<String>>();  
¡¡¡¡becomes:
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Map<String, List<String>> anagrams = new HashMap<>();  
¡¡¡¡4.ÊýÖµ¿É¼ÓÏ»®Ïß
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int one_million = 1_000_000;&n


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