problem in constructor

[Punit Jain]

i m trying a code, and as i think it should prints 10 infinite times, but it is not..
here is the code:

class A
{
	int a;
	A(int a)
	{
		this.a=a;			
		System.out.println(a);
		A a2 = new A();
	}
	A()
	{	
		A a3=new A(10);	
		System.out.println(a);
	}

	public static void main(String...args)
	{
	A a1=new A();		
	}
}

it printing
10 for some lines and than.
"at A.<init><A.java:8>"
"at A.<init><A.java:13>"
number of times.

i don't know why out put is this??

[Anayonkar Shivalkar]

Hi,

Can you please post complete output? At least first few lines and last few lines?

I suspect that you are getting a OutOfMemoryError due to calling same constructor inside itself.

I hope this helps.

[Punit Jain]

here is the complete output..


10
10
10
10
10
10
10
10
10
10
<snip: 3499 in total>
Exception in thread "main" java.lang.StackOverflowError
at sun.nio.cs.SingleByteEncoder.encodeArrayLoop(Unknown Source)
at sun.nio.cs.SingleByteEncoder.encodeLoop(Unknown Source)
at java.nio.charset.CharsetEncoder.encode(Unknown Source)
at sun.nio.cs.StreamEncoder.implWrite(Unknown Source)
at sun.nio.cs.StreamEncoder.write(Unknown Source)
at java.io.OutputStreamWriter.write(Unknown Source)
at java.io.BufferedWriter.flushBuffer(Unknown Source)
at java.io.PrintStream.write(Unknown Source)
at java.io.PrintStream.print(Unknown Source)
at java.io.PrintStream.println(Unknown Source)
at A.<init>(A.java:7)
at A.<init>(A.java:13)
at A.<init>(A.java:8)
at A.<init>(A.java:13)
at A.<init>(A.java:8)
at A.<init>(A.java:13)
at A.<init>(A.java:8)
at A.<init>(A.java:13)
<snip: lines 8 and 13 repeat for 90 lines>
at A.<init>(A.java:8)
at A.<init>(A.java:13)
at A.<init>(A.java:8)
at A.<init>(A.java:13)
at A.<init>(A.java:8)
at A.<init>(A.java:13)
at A.<init>(A.java:8)
at A.<init>(A.java:13)
at A.<init>(A.java:8)
at A.<init>(A.java:13)
at A.<init>(A.java:8)10
10
10
10
10
10
10
10
10
10
10
<snip: 124 in total>

at A.<init>(A.java:13)
at A.<init>(A.java:8)
at A.<init>(A.java:13)
at A.<init>(A.java:8)
at A.<init>(A.java:13)
at A.<init>(A.java:8)
at A.<init>(A.java:13)
<snip: lines 8 and 13 repeat for 898 lines>

[Anayonkar Shivalkar]

Hi,

Root cause is same as I mentioned - calling a constructor within itself. Hence, program crashed with throwing StackOverflowError as it can be seen in output:

Exception in thread "main" java.lang.StackOverflowError
at sun.nio.cs.SingleByteEncoder.encodeArrayLoop(Unknown Source)
at sun.nio.cs.SingleByteEncoder.encodeLoop(Unknown Source)
at java.nio.charset.CharsetEncoder.encode(Unknown Source)
at sun.nio.cs.StreamEncoder.implWrite(Unknown Source)
at sun.nio.cs.StreamEncoder.write(Unknown Source)
at java.io.OutputStreamWriter.write(Unknown Source)
at java.io.BufferedWriter.flushBuffer(Unknown Source)
at java.io.PrintStream.write(Unknown Source)
at java.io.PrintStream.print(Unknown Source)
at java.io.PrintStream.println(Unknown Source)
at A.<init>(A.java:7)
at A.<init>(A.java:13)
at A.<init>(A.java:8)
at A.<init>(A.java:13)
at A.<init>(A.java:8)
at A.<init>(A.java:13)
at A.<init>(A.java:8)
at A.<init>(A.java:13)
...

[Rob Spoor]

Punit, are you crazy? You posted over 4000 lines of output! I've removed quite a lot of those while still maintaining the relevant information.

Anayonkar is right. When you create a new A(), that creates a new A(10). That in turn creates a new A(), which again creates a new A(10). This continues until a StackOverflowError is thrown.

[Punit Jain]

okay..thank you...

[Punit Jain]

i am sorry for that.