JavaMadeSoEasy.com (JMSE): Output when we call new Object() inside constructor in java

It’s a tricky program asked in interviews these days.

What will be output when we call new S() in side constructor in java ?

package a;

class S {

S() {

System.out.println("in sc()");

new S(); // will cause recursion, because whenever we call new S() ,

//it will recursively call constructor

}

public class ConstructorRecursion {

public static void main(String... a) {

new S();

}

This program will end up with StackOverflowError .

//output

in sc()

Exception in thread "main" java.lang.StackOverflowError

at java.io.FileOutputStream.write(FileOutputStream.java:326)

at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)

at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)

at java.io.PrintStream.write(PrintStream.java:482)

at sun.nio.cs.StreamEncoder.writeBytes(StreamEncoder.java:221)

at sun.nio.cs.StreamEncoder.implFlushBuffer(StreamEncoder.java:291)

at sun.nio.cs.StreamEncoder.flushBuffer(StreamEncoder.java:104)

at java.io.OutputStreamWriter.flushBuffer(OutputStreamWriter.java:185)

at java.io.PrintStream.write(PrintStream.java:527)

at java.io.PrintStream.print(PrintStream.java:669)

at java.io.PrintStream.println(PrintStream.java:806)

at a.S.<init>(ConstructorRecursion.java:5)

at a.S.<init>(ConstructorRecursion.java:6)

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Labels: Core Java output java programs