jdk1.7新特性

int oneMillion = 1_000_000;
System.out.println((oneMillion * 2) + "---" + oneMillion);
// 1.7新增二进制字面量支持
byte aByte = (byte) 0b1000;
short aShort = (short) 0b010;
System.out.println(aByte + "-" + aShort);
// 1.7新增自动关闭流支持，不必在finally中写关闭操作
try(InputStream is = new InputStream(file);) {
} catch (Exception e) {}
// 反射
try {
	Class cls = Class.forName("chb.test.reflect.Student");
	Method m = cls.getDeclaredMethod("方法名", new Class[]{int.class, String.class});  
	m.invoke(cls.newInstance(), 20, "chb");
} catch (Exception e) {
	e.printStackTrace();
}