Some tips on Java parameters

Java Object Entry is a reference (a piece of memory), the underlying type is the value (copy content), the test code is as follows

 Public class TestA {    private  String name;      Public String GetName () {        return  name;    }      Public void setName (String name) {        this. Name = name;    }} 

 Public classTESTB { Public voidCreatetesta () {intID = 100; TestA TestA=NewTestA (); Testa.setname ("Chenjun"); System.out.println ("Createtesta");        SYSTEM.OUT.PRINTLN (ID);        System.out.println (Testa.getname ());        Alttesta (TestA, id); System.out.println ("After call Alttesta");        SYSTEM.OUT.PRINTLN (ID);    System.out.println (Testa.getname ()); }     Public voidAlttesta (TestA TestA,intID) {Testa.setname ("Zhanglan"); ID= 200; }         Public Static voidMain (string[] args) {TESTB test=NewTestb ();    Test.createtesta (); }}

Run results

Createtesta
100
Chen
After call Alttesta
100
Zhang

Some tips for Java parameters