OO Pilot Course--java the Knowledge collection of the beginning of the Meng

Common operations

Array

// Declaration * Array is also an object, length is an attribute int [] i=newint[5]; int [] i={0,1};  String[] str=newstring[5]; // string array, double quotation marks, distinguished from char character array String [] str={"A", "B"};

//Find the length array at the beginning , the length is determined (just a property, ' \ ' is useless)
Reference: http://www.cnblogs.com/entry-android/p/5539362.html
N=charset.length;

Array of strings

The length does not end with a terminator;

Inherited

Basic operations

// inheritance, only construction methods cannot be inherited  Public class  extends box{    publicdouble scale ;      Public Scalebox (double W,double h,double D,double  f) {          Super(W*F,H*F,D*F); // Direct use of the box construction method, must be the first line, first constructed to use        Scale=F;}

Method overloading

same name, but with different parameters and different definitions

Method Overrides (Overwrite)

Like the name, the return value is the same as the parameter, and in the subclass it is a new subclass of the child class, and the original method of the parent class cannot be used.

　　

OO Pilot Course--java the Knowledge collection of the beginning of the Meng