mapShare challenge

>> does the  'a' key corresponding value remains same in output map as in below case "aaa"?
Yes.

This is really a so basic challenge that you should be able to solve this on your own.

public Map<String, String> mapShare(Map<String, String> map) {
  
  String val=map.get("a");
  String backup=val;
  map.put("b",backup);
 // map.put("a","");
 map.remove("c");
  
  return map;

}

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Expected      Run            
mapShare({"b": "bbb", "c": "ccc", "a": "aaa"}) → {"b": "aaa", "a": "aaa"}      {"b": "aaa", "a": "aaa"}      OK      
mapShare({"b": "xyz", "c": "ccc"}) → {"b": "xyz"}      {"b": null}      X      
mapShare({"d": "hi", "c": "meh", "a": "aaa"}) → {"d": "hi", "b": "aaa", "a": "aaa"}      {"d": "hi", "b": "aaa", "a": "aaa"}      OK      
mapShare({"b": "1234", "c": "yo", "a": "xyz", "z": "zzz"}) → {"b": "xyz", "a": "xyz", "z": "zzz"}      {"b": "xyz", "a": "xyz", "z": "zzz"}      OK      
mapShare({"d": "ddd", "e": "everything", "b": "1234", "c": "yo", "a": "xyz"}) → {"d": "ddd", "e": "everything", "b": "xyz", "a": "xyz"}      {"d": "ddd", "e": "everything", "b": "xyz", "a": "xyz"}      OK      
other tests
X      
Correct for more than half the tests

Your progress graph for this problem

above fails one test.
please advise

public Map<String, String> mapShare(Map<String, String> map) {
  if(map.containsKey("a")){
  String val=map.get("a");
  String backup=val;
  map.put("b",backup);
 // map.put("a","");
 map.remove("c");
  }
  else{
     map.remove("c");
  }
  return map;

}

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above passes all tests. any improvements or alternate approaches?

You might consolidate some of the steps -
map.remove"c";  ==> in all cases
if (map.containsKey("a") {
  map.put("b",map.get("a")); ==>no need for intermediate variable
  map.put("a","");
}

Typo - map.remove("c"); ==> needs parentheses

public Map<String, String> mapShare(Map<String, String> map) {
  if(map.containsKey("a")){
 // String val=map.get("a");
 // String backup=val;
  map.put("b",map.get("a"));
 // map.put("a","");
 map.remove("c");
  }
 // else{
 //    map.remove("c");
 // }
  return map;

}

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above failse one test if i try to remove c in all cases

Expected      Run            
mapShare({"b": "bbb", "c": "ccc", "a": "aaa"}) → {"b": "aaa", "a": "aaa"}      {"b": "aaa", "a": "aaa"}      OK      
mapShare({"b": "xyz", "c": "ccc"}) → {"b": "xyz"}      {"b": "xyz", "c": "ccc"}      X      
mapShare({"d": "hi", "c": "meh", "a": "aaa"}) → {"d": "hi", "b": "aaa", "a": "aaa"}      {"d": "hi", "b": "aaa", "a": "aaa"}      OK      
mapShare({"b": "1234", "c": "yo", "a": "xyz", "z": "zzz"}) → {"b": "xyz", "a": "xyz", "z": "zzz"}      {"b": "xyz", "a": "xyz", "z": "zzz"}      OK      
mapShare({"d": "ddd", "e": "everything", "b": "1234", "c": "yo", "a": "xyz"}) → {"d": "ddd", "e": "everything", "b": "xyz", "a": "xyz"}      {"d": "ddd", "e": "everything", "b": "xyz", "a": "xyz"}      OK      
other tests
OK      

please advise

Without comments, your code is -
if (map.containsKey("a")) {
    map.put("b",map.get("a"));
    map.remove("c");
}
return map;

You need to remove "c" whether "a" exists or not -
    map.remove("c"); ==> note - if "c" doesn't exist, nothing will happen, if it does, the record is removed from the map
if (map.containsKey("a")) {
    map.put("b",map.get("a"));
    map.put("a",""); ==> this is still needed
}

public Map < String, String > mapShare(Map < String, String > map) {
    if (map.containsKey("a")) {
        String val = map.get("a");
        String backup = val;
        map.put("b", backup);
        // map.put("a","");
        map.remove("c");
    } else {
        map.remove("c");
    }
    return map;

}

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i see it is in if loop

public Map < String, String > mapShare(Map < String, String > map) {
    map.remove("c");
    if (map.containsKey("a")) {
        // String val=map.get("a");
        // String backup=val;
        map.put("b", map.get("a"));
        // map.put("a","");
        //map.remove("c");
    }
    // else{
    //    map.remove("c");
    // }
    return map;

}

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above passes all tests

http://www.tutorialspoint.com/online_java_formatter.htm
above is good formatter tool i found

>> above is good formatter tool i found
All right. Try to use it :)