oop - Pass by value and pass by reference in java -

oop - Pass by value and pass by reference in java -

i reading pass value , pass reference in java, got many articles,some of them saying java next 'pass value " , of them saying difference between primitive , object. wrote next sample code. , putting output also. please comment , share reply is.

i checked int, string , stringbuffer , employee class, working pass reference employee class only.

package test; class emp { public string name=""; public int age=0; public emp(string name, int age) { super(); this.name = name; this.age = age; } public string tostring() { homecoming "name: "+ this.name + "....age: "+ this.age; } } public class class1 { public class1() { super(); } public void dochange(int i) { = +10; system.out.println("value of integer in method:>"+ i); } public void dochange(emp i) { i.age=29; i.name="rishu"; system.out.println("value of employee in method "+i.tostring()); } public void dochange(string i) { = + " hello"; system.out.println("value of i->"+ i); } public static void main(string[] args) { int =10; string str="xxx"; class1 c= new class1(); stringbuffer sb= new stringbuffer(); emp e= new emp("abhi",28); sb.append("abc "); system.out.println(""); system.out.println("value of integer before method:->"+ i); c.dochange(i); system.out.println("value of integer after method:->"+ i); system.out.println(""); system.out.println("value of string before method:->"+ str); c.dochange(str); system.out.println("value of integer after method:->"+ str); system.out.println(""); system.out.println("value of stringbuffer before method:->"+ sb); c.dochange(sb.tostring()); system.out.println("value of stringbuffer after method:->"+ sb); system.out.println(""); system.out.println("value of employee before method:->"+ e.tostring()); c.dochange(e); system.out.println("value of employee after method:->"+ e.tostring()); } }

output:

value of integer before method:->10 value of integer in method:>20 value of integer after method:->10 value of string before method:->xxx value of i->xxx hello value of integer after method:->xxx value of stringbuffer before method:->abc value of i->abc hello value of stringbuffer after method:->abc value of employee before method:->name: abhi....age: 28 value of employee in method name: rishu....age: 29 value of employee after method:->name: rishu....age: 29

java pass-by-value only.

however, objects, passed value reference object. no, that's not same pass-by-reference. difference this:

if in this:

public void dochange(emp i) { = new emp("changed!", 42); }

it has absolutely no effect outside method - because reference i re-create of reference used outside method. however, refers same object, if utilize reference alter fields of object, these changes visible outside method.

java oop core