Quiz Time

[rjuyal]

Quote:

but found a String object there in the second println().

What about the first line?

[Eranga]

Ah, the first line too. How I miss it

[Jesdisciple]

I must have read to the end of the first page rather than the end of the thread. Disregard that post.

[Eranga]

Ok, in such cases quote the original message and make your comments.

Actually I don't think start from the beginning is much easy now. Just join with the current discussions.

[rjuyal]

Quote:

first line too. How I miss it

NumberFormatException

Code:

    public Integer(String s) throws NumberFormatException {
	this.value = parseInt(s, 10);
    }

Even the constructor uses that static method parseInt

[Eranga]

Yep, I got the point pal. Thanks for the hidden error. See how much we learn on this.

[rjuyal]

Once more

Code:

package com.faaltu.ObjectTest;

public class ObjectReferenceTest {
	ObjectReferenceTest objectReferenceTest;
	public int x;
	
	public static void main(String[] args) {
		ObjectReferenceTest objectReferenceTest = new ObjectReferenceTest();		
		objectReferenceTest.x = 20;
		System.out.println(objectReferenceTest);
		myFunction ( objectReferenceTest );
		System.out.println(objectReferenceTest);
	}
	
	static void myFunction( ObjectReferenceTest objectReferenceTest ){
		System.out.println("BEGIN ObjectReferenceTest.myFunction()");
		System.out.println(objectReferenceTest);
		objectReferenceTest = new ObjectReferenceTest();
		objectReferenceTest.x = 40;
		System.out.println(objectReferenceTest);
		System.out.println("END ObjectReferenceTest.myFunction()");
	}
	
	public String toString() {
		return "x: " + x; 
	}
	
}

guess the output ?

[Eranga]

Oops, it's too long to work on mind pal. Keep short next time Let me try.

From main function,

x: 20

From myFunction

BEGIN ObjectReferenceTest.myFunction()
x: 20

After this point value of x changed.

x: 40
END ObjectReferenceTest.myFunction()

From main function,

x: 20

So, for me it's ok. No compile errors. Am I correct?

[rjuyal]

yes you are always

[Eranga]

All these practice comes because of the notepad. I start to work on with it in the past. So I have to care of each line in my code.

[Eranga]

Here is the next one.

What's the output of this.

Code:

System.out.println("The answer is: "+11+9);

[Eku]

The answer is: 20

I think. =)

[Eku]

The answer is: 20

Its just a wild guess. . . =P Ive tried returning a equation in a function. So i think its the same thing around in System.out. It will sum it up first. If both are numbers it will treat the "+" sign as a part of the equation not a delimeter. Correct me if Im wrong.

[Eranga]

You are wrong my friend. It's all about string concatenations. Since you don't have think about parameter presidencies the output is,

Quote:

The answer is: 119

[Eku]

^_^ I see. . . One point to a new Knowledge.

[Eranga]

I think you know how to correct it.

[Eku]

I know now. Thanks for the Knowledge my friend. =P

[sukatoa]

Code:

public class Null {
    public static void ehem() {
        System.out.println("I am who am.");
    }
    public static void main(String[] args) {
        ((Null) null).ehem();
    }
}

Without compiling the said code, what should be the output?

[rjuyal]

somthing like, Static method can not be called with object

[Eranga]

I think output is,

Quote:

I am who am.

As far as I remember you used unsafe accessing to static field there. Am I correct?