Java代碼 一.List list = new ArrayList(); 二.list.add("item"); 三.String item = list.get(零); 4. 五.Set set = new HashSet(); 六.set.add("item"); 7. 八.Map map = new HashMap(); 九.map.put("key", 一); 十.int value = map.get("key"); List list = new ArrayList(); list.add("item"); String item = list.get(零);
Set set = new HashSet(); set.add("item");
Map map = new HashMap(); map.put("key", 一); int value = map.get("key"); 現(xiàn)下你還可以：
Java代碼 一.List list = ["item"]; 二.String item = list[零]; 3. 四.Set set = {"item"}; 5. 六.Map map = {"key" : 一}; 七.int value = map["key"]; List list = ["item"]; String item = list[零];
Java代碼 一.try (BufferedReader br = new BufferedReader(new FileReader(path)) { 2. return br.readLine(); 3.} 4. 五.You can declare more than one resource to close: 6. 七.try ( 8. InputStream in = new FileInputStream(src); 9. OutputStream out = new FileOutputStream(dest)) 10.{ 11. // code 12.} 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 }
三.對通用范例創(chuàng)造(diamond)的type摘引進行了改善
Java代碼 一.Map> anagrams = new HashMap>(); Map> anagrams = new HashMap>();
becomes:
Java代碼 一.Map> anagrams = new HashMap<>(); Map> anagrams = new HashMap<>();四.數(shù)值可加下劃線
Java代碼 一.int one_million = 一_000_000; int one_million = 一_000_000;
五.在switch中可運用string
Java代碼 一.String s = ... 二.switch(s) { 3. case "quux": 4. PRocessQuux(s); 5. // fall-through 6. 7. case "foo": 8. case "bar": 9. processFooOrBar(s); 10. break; 11. 12. case "baz": 13. processBaz(s); 14. // fall-through 15. 16. default: 17. processDefault(s); 18. break; 19.} String s = ... switch(s) { case "quux": processQuux(s); // fall-through
case "foo": case "bar": processFooOrBar(s); break;
case "baz": processBaz(s); // fall-through
default: processDefault(s); break; }
6.二進制文字
Java代碼 一.int binary = 零b1001_1001; int binary = 零b1001_1001;
