GAUTAM
asked on
Capturing null values in java
Hi experts...
I have two java functions which take in two maps of type LinkedHashMap<String,Integ er> sampleMap = new LinkedHashMap<String,Integ er>();
I have a condition where one of the values of the maps turn out as null i want to be able to capture its value.
How do i achieve this.
Please help...
I have two java functions which take in two maps of type LinkedHashMap<String,Integ
I have a condition where one of the values of the maps turn out as null i want to be able to capture its value.
How do i achieve this.
Please help...
public static <K extends Comparable<? super K>, V> Map<K, Boolean> compareEntries(final Map<K, V> map1, final Map<K, V> map2)
{
int cnt1=0,cnt2=0;
String val1=null,val2=null;
Map<K,Boolean> result=null;
try
{
final Collection<K> allKeys = new HashSet<K>();
allKeys.addAll(map1.keySet());
allKeys.addAll(map2.keySet());
result = new TreeMap<K,Boolean>();
for(final K key : allKeys)
{
result.put(key, map1.containsKey(key) == map2.containsKey(key) && Boolean.valueOf(equal(map1.get(key), map2.get(key))));
}
}
catch(Exception e)
{
e.printStackTrace();
}
return result;
}
private static boolean equal(final Object obj1, final Object obj2)
{
double max=0;
int i1=0,i2=0;
try
{
int intermediate=(Integer) obj1;
max=intermediate*devForStudents;
i1 = (Integer)obj1;
i2 = (Integer) obj2;
}
catch(Exception e)
{
e.printStackTrace();
}
return obj1 == obj2 || (obj1 != null && Math.abs(i1-i2) <= max);
}
>>I have a condition where one of the values of the maps turn out as null i want to be able to capture its value.
Wouldn't its value be ... null?
Wouldn't its value be ... null?
This is the one line (in your equal method) making trouble if the Map object contains keys with a null value
int intermediate = (Integer) obj1;
check if the object is null before casting
like:
if(obj1 != null)...
int intermediate = (Integer) obj1;
check if the object is null before casting
like:
if(obj1 != null)...
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if( map1 != null ) allKeys.addAll(map1.keySet
if( map2 != null ) allKeys.addAll(map2.keySet