import java.util.ArrayList; import java.util.List; /** * * */ public class AList { List list = new ArrayList(); public AList() { // TODO Auto-generated constructor stub } /** * */ public AList(List list) { this.list = list; } /* * (non-Javadoc) * * see java.lang.Object#equals(java.lang.Object) */ public boolean equals(Object obj) { // TODO Auto-generated method stub AList aList = (AList) obj; List arrayList = aList.getList(); if (arrayList.size() != list.size()) { return false; } for (int i = 0; i < list.size(); i++) { if (list.get(i) != arrayList.get(i)) { return false; } } return true; } /** * return the list */ public List getList() { return list; } /** * param list * the list to set */ public void setList(List list) { this.list = list; } /** * param args */ public static void main(String[] args) { // TODO Auto-generated method stub List integers = new ArrayList(); integers.add(10); integers.add(20); integers.add(30); integers.add(40); integers.add(50); List integers1 = new ArrayList(); integers1.add(10); integers1.add(20); integers1.add(30); integers1.add(40); integers1.add(60); AList aList1 = new AList(integers); AList aList2 = new AList(integers); System.out.println(\"list1 and list2 are equal? \" + aList1.equals(aList2)); aList2 = new AList(integers1); System.out .println(\"After adding 60 to list2, list1 and list2 are not equal? \" + aList1.equals(aList2)); } } OUTPUT: list1 and list2 are equal? true After adding 60 to list2, list1 and list2 are not equal? false Solution import java.util.ArrayList; import java.util.List; /** * * */ public class AList { List list = new ArrayList(); public AList() { // TODO Auto-generated constructor stub } /** * */ public AList(List list) { this.list = list; } /* * (non-Javadoc) * * see java.lang.Object#equals(java.lang.Object) */ public boolean equals(Object obj) { // TODO Auto-generated method stub AList aList = (AList) obj; List arrayList = aList.getList(); if (arrayList.size() != list.size()) { return false; } for (int i = 0; i < list.size(); i++) { if (list.get(i) != arrayList.get(i)) { return false; } } return true; } /** * return the list */ public List getList() { return list; } /** * param list * the list to set */ public void setList(List list) { this.list = list; } /** * param args */ public static void main(String[] args) { // TODO Auto-generated method stub List integers = new ArrayList(); integers.add(10); integers.add(20); integers.add(30); integers.add(40); integers.add(50); List integers1 = new ArrayList(); integers1.add(10); integers1.add(20); integers1.add(30); integers1.add(40); integers1.add(60); AList aList1 = new AList(integers); AList aList2 = new AList(integers); System.out.println(\"list1 and list2 are equal? \" + aList1.equals(aList2)); aList2 = new AList(integers1); System.out .println(\"After adding 60 to list2, list1 and list2 are not equal? \" + aList1.equals(aList2)); } } OUTPUT: list1 and list2 are equal? true After adding 60 to list2, list1 and list2 are not equal? fal.

1. import java.util.ArrayList;
import java.util.List;
/**
*
*
*/
public class AList {
List list = new ArrayList();
public AList() {
// TODO Auto-generated constructor stub
}
/**
*
*/
public AList(List list) {
this.list = list;
}
/*
* (non-Javadoc)
*
* see java.lang.Object#equals(java.lang.Object)
*/
public boolean equals(Object obj) {
// TODO Auto-generated method stub
AList aList = (AList) obj;
List arrayList = aList.getList();
if (arrayList.size() != list.size()) {
return false;
}
for (int i = 0; i < list.size(); i++) {
if (list.get(i) != arrayList.get(i)) {
return false;
}
}

2. return true;
}
/**
* return the list
*/
public List getList() {
return list;
}
/**
* param list
* the list to set
*/
public void setList(List list) {
this.list = list;
}
/**
* param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
List integers = new ArrayList();
integers.add(10);
integers.add(20);
integers.add(30);
integers.add(40);
integers.add(50);
List integers1 = new ArrayList();
integers1.add(10);
integers1.add(20);
integers1.add(30);
integers1.add(40);
integers1.add(60);
AList aList1 = new AList(integers);
AList aList2 = new AList(integers);
System.out.println("list1 and list2 are equal? "
+ aList1.equals(aList2));

3. aList2 = new AList(integers1);
System.out
.println("After adding 60 to list2, list1 and list2 are not equal? "
+ aList1.equals(aList2));
}
}
OUTPUT:
list1 and list2 are equal? true
After adding 60 to list2, list1 and list2 are not equal? false
Solution
import java.util.ArrayList;
import java.util.List;
/**
*
*
*/
public class AList {
List list = new ArrayList();
public AList() {
// TODO Auto-generated constructor stub
}
/**
*
*/
public AList(List list) {
this.list = list;
}
/*
* (non-Javadoc)
*
* see java.lang.Object#equals(java.lang.Object)
*/
public boolean equals(Object obj) {

4. // TODO Auto-generated method stub
AList aList = (AList) obj;
List arrayList = aList.getList();
if (arrayList.size() != list.size()) {
return false;
}
for (int i = 0; i < list.size(); i++) {
if (list.get(i) != arrayList.get(i)) {
return false;
}
}
return true;
}
/**
* return the list
*/
public List getList() {
return list;
}
/**
* param list
* the list to set
*/
public void setList(List list) {
this.list = list;
}
/**
* param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
List integers = new ArrayList();
integers.add(10);
integers.add(20);
integers.add(30);
integers.add(40);

5. integers.add(50);
List integers1 = new ArrayList();
integers1.add(10);
integers1.add(20);
integers1.add(30);
integers1.add(40);
integers1.add(60);
AList aList1 = new AList(integers);
AList aList2 = new AList(integers);
System.out.println("list1 and list2 are equal? "
+ aList1.equals(aList2));
aList2 = new AList(integers1);
System.out
.println("After adding 60 to list2, list1 and list2 are not equal? "
+ aList1.equals(aList2));
}
}
OUTPUT:
list1 and list2 are equal? true
After adding 60 to list2, list1 and list2 are not equal? false