Java pass by reference vs pass by value trouble

Question

why am i getting an error in the pass by reference example obj1.add200really is underlined

public class Test { private int number; Test(){ number = 1; } public static void main(String[] args) { Test obj1 = new Test(); System.out.println("the number is " + obj1.number); System.out.println("the number 1 plus 200 is " + obj1.add200(obj1.number)); System.out.println("while the number is still " + obj1.number); System.out.println("\n"); System.out.println("the number is " + obj1.number); System.out.println("the number 1 plus 200 is " + obj1.add200really(obj1.number)); System.out.println("while the number is still " + obj1.number); } int add200(int somenumber){ somenumber = somenumber + 200; return somenumber; } int add200really(Test myobj){ myobj.number = 999; return myobj.number; } }

KV Prajapati · Accepted Answer · 2011-09-22 04:22:58Z

1

Use obj1.add200really(obj1);

answered Sep 22, 2011 at 4:22

KV Prajapati

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2 Comments

KV Prajapati Over a year ago

@user133466 - I don't think so because you do not know the basic facts - Java is always pass-by-value. Please read this thread - stackoverflow.com/questions/40480/is-java-pass-by-reference

Miserable Variable Over a year ago

someObj.func(someObj) is almost never the right thing to do. @user133466 I don't think you have understood the problem, leave alone the solution.

Brian Roach · Accepted Answer · 2011-09-22 04:26:01Z

Because you have no method add200really(int)

Your method add200really() requires an object. You're trying to call it with an int

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