java 7 新特性 （类型推断,支持String 的swtich语法)...
1.更好的2进制文本
int mask = 0b101010101010;
支持下划线
int mask = 0b1010_1010_1010;
long big = 9_223_783_036_967_937L;
2.支持Strring Switch Statement
以前case 支持int 和枚举
现在String 也支持
int monthNameToDays(String s, int year) {
switch(s) {
case "April": case "June":
case "September": case "November":
return 30;
case "January": case "March":
case "May": case "July":
case "August": case "December":
return 31;
3.可推断的数据类型<>
(1)没有泛型
List strList = new ArrayList();
(2)具有泛型
List<String> strList = new ArrayList<String>();
List<Map<String, List<String>> strList =
new ArrayList<Map<String, List<String>>();
(3)java 7支持的类型
List<String> strList = new ArrayList<>();
List<Map<String, List<String>> strList =
new ArrayList<>();
4.Exceptions Galore
try {
...
} catch(ClassNotFoundException cnfe) {
log(cnfe);
throw cnfe;
} catch(InstantiationException ie) {
log(ie);
throw ie;
} catch(NoSuchMethodException nsme) {
log(nsme);
throw nsme;
} catch(InvocationTargetException ite) {
log(ite);
throw ite;
}
Multi-Catch
try {
// Reflective operations calling Class.forName,
// Class.newInstance, Class.getMethod,
// Method.invoke, etc.
} catch(final ClassNotFoundException |
InstantiationException |
NoSuchMethodException |
InvocationTargetException e) {
log(e);
throw e;
}
摘自 rjgcx2的专栏
补充：软件开发 , Java ,
