The document contains Java code for a `sequence` class that allows the addition of integers, retrieval of a copy of the sequence, and merging of sequences, including an option to remove duplicates. It also includes a test class `sequencetest` that demonstrates the functionality by creating sequences, merging them, and outputting the results to the console. Sample outputs are provided to illustrate the results of the operations performed on the sequences.

1. Hi, Please find my code:
##### Sequence.java ##############
import java.util.ArrayList;
public class Sequence {
private ArrayList values;
public Sequence(){
values= new ArrayList();
}
public void add(int n){
values.add(n);
}
// return copy of list
public ArrayList getSequence(){
ArrayList copyList = new ArrayList<>(values.size());
for (Integer x : values) {
copyList.add(x);
}
return copyList;
}
public String toString(){
return values.toString();
}
public Sequence append(Sequence other){
Sequence res = new Sequence();
for(Integer x : values)
res.add(x);
for(Integer x:other.getSequence())
res.add(x);
return res;
}
public Sequence merge(Sequence other){
int i=0, j=0;
ArrayList otherList = other.getSequence();
Sequence mergeSeq = new Sequence();
while(i otherList = other.getSequence();

2. Sequence mergeSeq = new Sequence();
while(i otherList.get(j)){
mergeSeq.add(otherList.get(j));
j++;
}else{ // both have same value
mergeSeq.add(values.get(i));
i++;
j++;
}
}
while(i < values.size()){
mergeSeq.add(values.get(i));
i++;
}
while(j < otherList.size()){
mergeSeq.add(otherList.get(j));
j++;
}
return mergeSeq;
}
}
############ SequenceTest.java ###############
public class SequenceTest {
public static void main(String[] args) {
Sequence s1 = new Sequence();
Sequence s2 = new Sequence();
s1.add(1);
s1.add(4);
s1.add(9);
s1.add(16);

3. s2.add(9);
s2.add(7);
s2.add(4);
s2.add(9);
s2.add(11);
Sequence s3 = s1.merge(s2);
System.out.println("S1: "+s1.toString());
System.out.println("S2: "+s2.toString());
System.out.println("S1+S2: "+s3.toString());
Sequence s4 = new Sequence();
s4.add(4);
s4.add(9);
s4.add(14);
s4.add(15);
s4.add(16);
s4.add(20);
s4.add(22);
Sequence s5 = s1.mergeNoDuplicates(s4);
System.out.println("S4: "+s4.toString());
System.out.println("S1+S4(no duplicate): "+s5.toString());
}
}
/*
Sample Output:
S1: [1, 4, 9, 16]
S2: [9, 7, 4, 9, 11]
S1+S2: [1, 9, 4, 7, 9, 4, 16, 9, 11]
S4: [4, 9, 14, 15, 16, 20, 22]
S1+S4(no duplicate): [1, 4, 9, 14, 15, 16, 20, 22]
*/

4. Solution
Hi, Please find my code:
##### Sequence.java ##############
import java.util.ArrayList;
public class Sequence {
private ArrayList values;
public Sequence(){
values= new ArrayList();
}
public void add(int n){
values.add(n);
}
// return copy of list
public ArrayList getSequence(){
ArrayList copyList = new ArrayList<>(values.size());
for (Integer x : values) {
copyList.add(x);
}
return copyList;
}
public String toString(){
return values.toString();
}
public Sequence append(Sequence other){
Sequence res = new Sequence();
for(Integer x : values)
res.add(x);
for(Integer x:other.getSequence())
res.add(x);
return res;
}
public Sequence merge(Sequence other){
int i=0, j=0;
ArrayList otherList = other.getSequence();

5. Sequence mergeSeq = new Sequence();
while(i otherList = other.getSequence();
Sequence mergeSeq = new Sequence();
while(i otherList.get(j)){
mergeSeq.add(otherList.get(j));
j++;
}else{ // both have same value
mergeSeq.add(values.get(i));
i++;
j++;
}
}
while(i < values.size()){
mergeSeq.add(values.get(i));
i++;
}
while(j < otherList.size()){
mergeSeq.add(otherList.get(j));
j++;
}
return mergeSeq;
}
}
############ SequenceTest.java ###############
public class SequenceTest {
public static void main(String[] args) {
Sequence s1 = new Sequence();
Sequence s2 = new Sequence();
s1.add(1);
s1.add(4);
s1.add(9);

6. s1.add(16);
s2.add(9);
s2.add(7);
s2.add(4);
s2.add(9);
s2.add(11);
Sequence s3 = s1.merge(s2);
System.out.println("S1: "+s1.toString());
System.out.println("S2: "+s2.toString());
System.out.println("S1+S2: "+s3.toString());
Sequence s4 = new Sequence();
s4.add(4);
s4.add(9);
s4.add(14);
s4.add(15);
s4.add(16);
s4.add(20);
s4.add(22);
Sequence s5 = s1.mergeNoDuplicates(s4);
System.out.println("S4: "+s4.toString());
System.out.println("S1+S4(no duplicate): "+s5.toString());
}
}
/*
Sample Output:
S1: [1, 4, 9, 16]
S2: [9, 7, 4, 9, 11]
S1+S2: [1, 9, 4, 7, 9, 4, 16, 9, 11]
S4: [4, 9, 14, 15, 16, 20, 22]

7. S1+S4(no duplicate): [1, 4, 9, 14, 15, 16, 20, 22]
*/