24-11-2018 Interview questions

Verifone
==============
1.string Permutation
2. decimal to binary format

Siemens
=========
1. Why components and service are registering in app.module.ts
2. javascript vs type script
3. phone number mask (ex: ***-***-1234) using angular
4. Hashset internally implementation
5 . HashMap internals
6. angular 1 vs 2
7. .............
................

NTTData FA
==========
1. Project Architecture
2. why Micro services used
3. DAo class implementation sudo

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public class StringPermutation {

public static void permutation(String str) {

    permutation("",str);

}

    private static void permutation(String prefix, String str) {

int n=str.length();

if(n==0) {

    System.out.println(prefix);

}

else {

    for(int i=0;i<str.length();i++) {

        permutation(prefix+str.charAt(i),str.substring(0, i)+str.substring(i+1,n));

    }

}

}

    public static void main(String[] args) {

        // TODO Auto-generated method stub

        String s="abc";

  StringPermutation.permutation(s);

    }

}