java - Simple yet in depth explanation of this code -

i beginner programming, , java. have very, little experience java, simple, yet in depth explanation of code. code uses 2 classes , many methods.

class apples:

package jacob; import java.util.scanner;  class apples { public static void main (string args[]){     scanner input = new scanner(system.in);     grapes gobject = new grapes();      system.out.println("enter name of first gf here: ");     string temp = input.nextline();     gobject.setname(temp);     gobject.saying();    } } 

class grapes:

package jacob; public class grapes { private string girlname; public void setname(string name){     girlname=name; } public string getname(){     return girlname; } public void saying(){     system.out.printf("your first gf %s", getname()); } } 

i confused when these 2 parts:

gobject.setname(temp);     gobject.saying(); 

and

private string girlname; public void setname(string name){     girlname=name; } public string getname(){     return girlname; } public void saying(){     system.out.printf("your first gf %s", getname()); 

why 1 go through trouble when have done:

package jacob; import java.util.scanner; public class test { public static void main (string args[]){     scanner input = new scanner(system.in);     system.out.println("enter name of first gf here: ");     string gfname = input.nextline();     system.out.println("the name of first gf " + gfname + "."); } } 

please note original code thenewboston , not mine. second bit of code have created.

your question fundamentals of object oriented programming. reason confusion method saying() , whole program trivial. in non trivial program impossible avoid using method or object. since body of method 1 line can replace simple println if body more complex have hard time repeating more 1 name. example let's assume method saying() this:

public void saying(){     string name = getname(); //saves name in variable     stringbuilder reverse = new stringbuilder(name.length()); //creates new variable hold reversed name     for(i=name.length()-1;i>=0;i--){ //this loops through characters in name , makes reversed name         reverseapend(name.charat(i);     }     system.out.println("the reverse of gf name is" + reverse + "."); } 

this method still prints 1 line more complex body. consider want reverse 3 names , print them. 1 easier setting field , calling method 3 times or typing whole method body 3 times? if want reverse string in part o program. can reuse method instead of typing chunk of code every time need it. 1 of many benefits of using objects. can read abstraction, encapsulation , inheritance understand importance of objects. broad topic accommodated in simple answer. best thing read book object oriented programming.