Given the below function, its partitions and blocks, provide valid values for ea
ID: 654490 • Letter: G
Question
Given the below function, its partitions and blocks, provide valid values for each block.
public Set convert(Set a1, Set a2)
/*
Effects: if a1 or a2 are null, throw NullPointerException
else return the non-null Set that is the result of conversion of sets
*/
Type of a1
b1: a1 is null
b2: a1 is empty set
b3: a1 has one element
b4: a1 has more than one element
Relationship between a1 and a2
b1: a1 and a2 represent same set
b2: a1 is a subset of a2
b3: a2 is a subset of a1
b4: a1 and a2 do not have any elements in common
Set a1 contains null elements
b1: true
b2: false
Type of data in set a2
b1: characters
b2: integers
b3: strings
Explanation / Answer
import java.util.Arrays;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
public class MySet {
public Set convert(Set a1, Set a2){
if(a1==null||a2==null){
throw new NullPointerException();
}else{
a1.add(a2);
return a1;
}
}
public static void main(String[] a) {
String typeOfa1,relationshipA1A2;
boolean a1ContainsNull;
char b1[]={'a','b','c','d'};
int b2[]={1,2,3,4,5};
String b3[] = { "A", "B", "C", "D", "E" };
Set a1=new HashSet<String>();
Set a2 = new HashSet(Arrays.asList(b1));
a2.add(b2);
a2.add(b3);
MySet ms=new MySet();
ms.convert(a1,a2);
if(a1.equals(null)){
typeOfa1="b1";
}
if(a1.isEmpty()){
typeOfa1="b2";
}
if(a1.size()==1){
typeOfa1="b3";
}
if(a1.size()>1){
typeOfa1="b4";
}
if(a1.equals(a2)){
relationshipA1A2="b1";
}
if(a2.contains(a1)){
relationshipA1A2="b2";
}
if(a1.contains(a2)){
relationshipA1A2="b3";
}
if(!a1.equals(a2)){
relationshipA1A2="b4";
}
Iterator<Set> i=a1.iterator();
while (i.hasNext()){
if(i.next()==null){
a1ContainsNull=true;
}else{
a1ContainsNull=false;
}
}
}
}
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