Basic Application of java reference Transfer

Basic Application of java reference Transfer
Package com. cloud. day1;


Public class Demo1 {
Public static void main (String [] args ){
// Basic application of reference Transfer
Demo2 d2 = new Demo2 ();
D2.temp = 500;
System. out. println (before fun call: + d2.temp );
Fun (d2 );
System. out. println (+ d2.temp after fun is called );
System. out. println (**********);
String str1 = hello;
System. out. println (before calling fun1: + str1 );
Fun1 (str1 );
System. out. println (after calling fun1: + str1 );
System. out. println (**********);
Demo3 d3 = new Demo3 ();
D3.temp = world;
System. out. println (before calling fun1: + d3.temp );
Fun2 (d3 );
System. out. println (after fun1 is called: + d3.temp );
// Receives the reference of your own class
System. out. println (**********);
Demo4 d4 = new Demo4 ();
D4.setTemp (100 );
D4.fun (d4 );
System. out. println (d4.getTemp ());
// Case Study: one-to-one correspondence
Person per = new Person (Tom, 20 );
Book bk = new Book (JAVA tutorial, 50366f );
Per. setBook (bk );
Bk. setPerson (per );
System. out. println (for books: + per. getName () + -- + per. getBook (). getTitle () + -- + per. getBook (). getPrice ());
System. out. println (Book: + bk. getTitle () + -- + bk. getPerson (). getName ());
}
Public static void fun (Demo2 d2 ){
D2.temp = 1000;
}
Public static void fun1 (String str2 ){
Str2 = mdld;
}
Public static void fun2 (Demo3 d3 ){
D3.temp = mldl;
}
}
Class Demo2 {
Int temp = 100;
}
Class Demo3 {
String temp = hello;
}
Class Demo4 {
Private int temp = 30;
Public void fun (Demo4 d4 ){
D4.temp = 40;
}
Public int getTemp (){
Return temp;
}
Public void setTemp (int temp ){
This. temp = temp;
}
}
Class Person {
Private String name;
Private int age;
Private Book;
Public String getName (){
Return name;
}
Public void setName (String name ){
This. name = name;
}
Public int getAge (){
Return age;
}
Public void setAge (int age ){
This. age = age;
}
Public Book getBook (){
Return book;
}
Public void setBook (Book book ){
This. book = book;
}
Public Person (String name, int age ){
This. setName (name );
This. setAge (age );
}
}
Class Book {
Private String title;
Private float price;
Private Person person;
Public Book (String title, float price ){
This. setTitle (title );
This. setPrice (price );
}
Public String getTitle (){
Return title;
}
Public void setTitle (String title ){
This. title = title;
}
Public float getPrice (){
Return price;
}
Public void setPrice (float price ){
This. price = price;
}
Public Person getPerson (){
Return person;
}
Public void setPerson (Person person ){
This. person = person;
}

}

The last case is very important. It is applied to the three major Java Web frameworks.