Failing JUnit Tests

jeriffstive

Failing Junit Tests:
2 parts of my assignment are failing JUnit tests and I don't know why, hoping someone on here can fix them. First part basically-returns the element whos position in the list matches the parameter. Second part returns true if the parameter is in the list, false if parameter is not. I know it must be a small logical error in both.

First part code

Code:

public int getAt(int index) {
if (index<0 || index>values[(values.length-1)]){
throw new IndexOutOfBoundsException();
}
int retValue = 0;
for(int i =0; i<values.length; i++){
if(values[i]==index){
retValue = values[index];
}
}
return retValue;
} 

Second Part Code

Code:

public boolean contains(int number) {
boolean retValue = false;
for(int i =0; i<values.length-1; i++){
if(values[i]==number){
retValue = true;
}else{
retValue = false;
}
}
return retValue;
} 

DrRakha

hi brother ,
to get element using index i think the function should be like this :

Code:

public int getAt(int index) {
if (index<0 || index>(values.length-1)){
throw new IndexOutOfBoundsException();
}
int retValue = 0;
for(int i =0; i<values.length; i++){
if(i==index){
retValue = values[index];
}
}
return retValue;
}
 

apeter

Hello jeriffstive,

it's quite clear that the second code isn't working like expected.

You are iterating over the whole array using a for-loop. Inside the loop you are testing, if the value at position i is equal to the value number. But if you hit the position you don't stop iterating and thats the problem.

Example: your array values contains {1, 3, 5} and you are looking for 3. Your for-loop iterates the three values 1, 3 and 5. The variable retVal will have the following values:
for i=0, values[0]=1: retVal = false
for i=1, values[1]=3: retVal = true
for i=2, values[2]=5: retVal = false
and your function will return false.

You have to stop your searching, when you find the element. The correct code would be:

Code:

   public boolean contains(int number) {
      for(int i = 0; i < values.length - 1; i++){
         if(values[i] == number){
            return true;
         }
      }
      return false;
   }   

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Failing JUnit Tests