Arraylist/List comparison in Java:
Now we have a scenario to split three list/arraylist values to seven lists with respect to list/arraylist values.
Input:
[plain gutter=”false”]
List 1 contains:
Java
PHP
26
God
List 2 contains:
C
Java
PHP
List 3 contains:
26
Guru
C
Java
[/plain]
Expected Output:
[plain gutter=”false”]
only in list 1 ::: God
only in list 2 :::
only in list 3 ::: Guru
In 1 and 2 ::: PHP
In 1 and 3 ::: 26
In 2 and 3 ::: C
common in all lists ::: Java
[/plain]
Three List Comparison Java Source code:
[java gutter=”false”]
import java.util.ArrayList;
import java.util.List;
public class ListCompare {
public static void main(String[] args){
List<String> myList1 = new ArrayList<String>();
myList1.add("Java");
myList1.add("PHP");
myList1.add("26");
myList1.add("God");
List<String> myList2 = new ArrayList<String>();
myList2.add("C");
myList2.add("Java");
myList2.add("PHP");
List<String> myList3 = new ArrayList<String>();
myList3.add("26");
myList3.add("Guru");
myList3.add("C");
myList3.add("Java");
List<String> commonList = new ArrayList<String>();
List<String> commonInList1and2 = new ArrayList<String>();
List<String> commonInList1and3 = new ArrayList<String>();
List<String> commonInList2and3 = new ArrayList<String>();
for(String list2Val : myList2){
for(String list1Val : myList1){
for (String list3Val : myList3) {
if(list3Val.equalsIgnoreCase(list1Val) && list3Val.equalsIgnoreCase(list2Val)){
commonList.add(list3Val);
}
}
}
}
myList3.removeAll(commonList);
myList2.removeAll(commonList);
myList1.removeAll(commonList);
commonInList1and2 = twoListCompare(myList1,myList2);
commonInList1and3 = twoListCompare(myList1,myList3);
commonInList2and3 = twoListCompare(myList2,myList3);
myList3.removeAll(commonInList2and3);
myList3.removeAll(commonInList1and3);
myList2.removeAll(commonInList2and3);
myList2.removeAll(commonInList1and2);
myList1.removeAll(commonInList1and3);
myList1.removeAll(commonInList1and2);
for (String string : myList1) {
System.out.println("only in list 1 :::"+string);
}
for (String string : myList2) {
System.out.println("only in list 2 :::"+string);
}
for (String string : myList3) {
System.out.println("only in list 3 :::"+string);
}
for (String string : commonList) {
System.out.println("common in all lists :::"+string);
}
for (String string : commonInList1and2) {
System.out.println("In 1 and 2 :::"+string);
}
for (String string : commonInList1and3) {
System.out.println("In 1 and 3 :::"+string);
}
for (String string : commonInList2and3) {
System.out.println("In 2 and 3 :::"+string);
}
}
private static List<String> twoListCompare(List<String> myList1,List<String> myList2){
List<String> commonList = new ArrayList<String>();
for(String list2Val : myList2){
for(String list1Val : myList1){
if(list2Val.equalsIgnoreCase(list1Val)){
commonList.add(list2Val);
}
}
}
return commonList;
}
}
[/java]
Output:
[plain gutter=”false”]
only in list 1 :::God
only in list 3 :::Guru
common in all lists :::Java
In 1 and 2 :::PHP
In 1 and 3 :::26
In 2 and 3 :::C
[/plain]
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