Short step, a thousand miles; not small streams, into jianghai.
Java language foundation
Java reflection
Look at the positive operation, this class is instantiated, then use the class object to operate.
public class Apple {
private int price;
public int highprice;
int lowprice;
String name;
public int getprice() {
return price;
}
public void setprice(int price) {
this.price = price;
}
public void sell(){
System.out.println("All apples are selling!");
}
private void buy() {
System.out.println("Buy apples!");
}
public static void main(String[] args) throws Exception {
//正常调用
Apple apple = new Apple();
apple.setprice(5);
System.out.println("apple's price is: " + apple.getprice());
}
}
Using reflection, first obtain the file object bytecode class (.class)
Get bytecode file object in three ways.
Class cls = Class.forName("Testfather.Apple");
Class cls = Apple.class;
Class cls = apple.getClass();
1. Static method forName Class class, directly into a bytecode file object class, then the class source file, or stage, and does not become the byte code file.
Class cls = Class.forName("Testfather.Apple");
2. When the class is loaded into .class files, this time into a .class Person class, acquiring the bytecode file object, i.e. gets its own, in the class bytecode stage.
Class cls = Apple.class;
Example 3. By acquiring the class bytecode class file object class creates objects in stages.
Class cls = apple.getClass();