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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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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:
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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
}
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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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create PROCEDURE pagelist
@tablename nvarchar(50),
@fieldname nvarchar(50)='*',
@pagesize int output,--ÿҳÏÔʾ¼Ç¼ÌõÊý
@currentpage int output,--µÚ¼¸Ò³
@orderid nvarchar(50),--Ö÷¼üÅÅÐò
@sort int,--ÅÅÐò·½Ê½£¬1±íʾÉýÐò£¬0±íʾ½µÐòÅÅÁÐ
......
class Node
{
private Object obj;
private Node next;
//ÓÃÊý¾ÝÓò¹¹ÔìÒ»¸ö½Úµã¶ÔÏó
public Node(Object obj)
{
this.obj=obj;
}
//·µ»ØÏÂÒ»½ÚµãµÄ¶ÔÏó
public Node getNext()
{
return this.next;
}
//ÉèÖñ¾½ÚµãµÄÁ´Óò
public void setNext(Node next)
{
this.next=next;
}
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class Promote
{
public static void main(String args[])
{
byte b = 50;
char c = 'a';
short s = 1024;
int i = 50000;
float ......
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void notify()
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