Making third List from two Lists for common names in Java -

i have 2 java lists. first list contains name column. second list contains name , status columns.

first list contains: david; david

second list contains: david, 3; david, 1; david, 2 ;john, 1; john 3;

for each common name 2 lists, should make third list in following 1 row.

name status1 status2 status3

david 1 2 3
john 1 3

how can achieve using java list collection ?

my example: created 3 classes holds 3 lists. //first class

public class firstclass {
private string name;

public firstclass(string name) {     super();     this.name = name; } 

// setters , getters here }

// second class

public class secondclass {

private string name;  private int status;   public secondclass(string name, int status) {     super();     this.name = name;     this.status = status; }    // setters , getters here 

}

// thirdclass

public class thirdclass {

private string name;     private int status1;     private int status2;     private int status3;  public thirdclass(string name, int status1, int status2, int status3) {     super();     this.name = name;     this.status1 = status1;     this.status2 = status2;     this.status3 = status3; }  public thirdclass() {     // todo auto-generated constructor stub }  // setters , getters here 

}

// execution class

import java.util.*;

public class clientexecute {

public static void main(string[] args) {       list<firstclass> a1 = new arraylist<firstclass>();      a1.add(new firstclass("david"));     a1.add(new firstclass("john"));     a1.add(new firstclass("david"));       list<secondclass> a2 = new arraylist<secondclass>();      a2.add(new secondclass ("john", 2));     a2.add(new secondclass ("david", 2));     a2.add(new secondclass ("david", 3));     a2.add(new secondclass ("david", 1));     a2.add(new secondclass ("john", 3));   thirdclass third = null;  list<thirdclass> a3 =null;      for(firstclass  first: a1) {          third = new thirdclass();         a3 = new arraylist<thirdclass>();          for( secondclass second: a2) {              if(first.getname().equalsignorecase(second.getname())) {                  third.setname(second.getname());                  if(second.getstatus() ==1){                      third.setstatus1(second.getstatus());                 }                 else if(second.getstatus() ==2){                      third.setstatus2(second.getstatus());                 }                 else if(second.getstatus() ==3){                      third.setstatus3(second.getstatus());                 }             }              a3.add(third);         }      }      printthirdlist(a3);  }  private static void printthirdlist(list<thirdclass> a3) {              for(thirdclass list: a3){             system.out.println(list.getname()+list.getstatus1()+list.getstatus2()+list.getstatus3());                 } } 

}

i think, doing wrong in iterating 2 lists while comparing. getting following wrong output:

    david 1 2 3;     david 1 2 3;     david 1 2 3;     david 1 2 3;     david 1 2 3;     expected output:     david 1 2 3;     john  1   3; 

first, move arraylist of third class outside first loop.

second, remove a3.add second loop , put in first loop since adding same instance every value of second class. causing multiple output.

list<thirdclass> a3 = new arraylist<thirdclass>();      for(firstclass  first: a1) {          thirdclass third = new thirdclass();          for( secondclass second: a2) {              if(first.getname().equalsignorecase(second.getname())) {                  third.setname(second.getname());                  if(second.getstatus() ==1){                      third.setstatus1(second.getstatus());                 }                 else if(second.getstatus() ==2){                      third.setstatus2(second.getstatus());                 }                 else if(second.getstatus() ==3){                      third.setstatus3(second.getstatus());                 }             }         }         a3.add(third);     }