Object reference

[Nagaraju Mulinti]

Hi All,

What is the value will I get when I execute the below class.I guss, I will get null. Why don't we get "2" value. Can you please clarify me below process. Thanks in advance..!

public class MyClass{

public static void main(String a[])
{

String one=null;
String two=null:

getvalues(one,two);

System.out.println(two);
}

getValues(String one,String two)
{
two="2";

}

}

[Antany Vasanth]

Hi Nagaraj,

In both the "main" method and "getvalue" method the variable "one" and "two" are local variables. So the reference change for the variable "two" in the "getvalue" method doesn't reflect the variable "two" in the main method.

Hence the result is null.

Regards
Antany.

[Jesper de Jong]

There are at least three reasons why the code you posted will not compile:

getvalues is not the same as getValues - Java is case-sensitive

You did not specify a return type for the getValues method

The main() method is static, but getValues() is not - you cannot call a non-static method from a static one

Please make sure that the code example you post is correct. In this case the question was simple to understand, but making simple mistakes like that can confuse people who want to answer your question.

[Campbell Ritchie]

Have you been reading the other threads in "beginning Java"? Somebody else has a similar problem at the moment.

[Roldan Baldo]

Nagaraju Mulinti wrote:Hi All,

What is the value will I get when I execute the below class.I guss, I will get null. Why don't we get "2" value. Can you please clarify me below process. Thanks in advance..!

public class MyClass{

public static void main(String a[])
{

String one=null;
String two=null:

getvalues(one,two);

System.out.println(two);
}

getValues(String one,String two)
{
two="2";

}

}

google how methods work in java, and how to declare variables. i have an example for you.

class methodAndVariable{
  public static void main(String []args){
    String one = null;
    String two = null;
    System.out.println(""+getValue(one,two));
  }
  private String getValue(String one, String two){
    return "2";
  }
}

i just made it closer to your code, for you to analyze it.

[Nitish Bangera]

Well with the above program with same getvalue of Roldan we can use to reassign two in the main method.

two = getvalue(one,two)

then print two. Also please make getvalue static otherwise you cannot use it in the main method without the instance.