How to delete an object from a linked list in Java?
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Java
There is a problem in my code. I made a sample program to display the EMP details in the link list. Now the problem when I try to delete a specific entry means that it doesn't work. I hope there are some errors in my code. What can you suggest?
import java.util.*; class EmpDedup { int record; String fprint; int fid; EmpDedup(int record,String fprint,int fid) { this.record = record; this.fprint = fprint; this.fid = fid; } public int getRecord() { return record; } public String getFprint() { return fprint; } public int getFid() { return fid; } public static void main(String[] args) { int count = 0; LinkedList<EmpDedup> list = new LinkedList<EmpDedup>(); list.add(new EmpDedup(101,"entry1",20)); list.add(new EmpDedup(102,"entry2",30)); list.add(new EmpDedup(103,"entry3",40)); list.add(new EmpDedup(104,"entry4",50)); Scanner input = new Scanner(system.in); System.out.print("Enter record no to display: "); int rec = input.nextInt(); for (EmpDedup data : list) { if (data.getRecord() == rec) { System.out.println(data.getRecord() + "\t" + data.getFprint() + "\t" + data.getFid() + "\t"); count++; } } System.out.println("The size of an linkedlist is: \t" + list.size()); System.out.println("The number of available record is :" + count); System.out.println("The size of an linkedlist is: \t" + list.size()); Scanner input1 = new Scanner(system.in); System.out.print("Enter record no to delete: ");// here i try to delete a particular record int rec1 = input1.nextInt(); for (EmpDedup data : list) { if (data.getRecord() == rec1) { // System.out.println(data.getRecord()+"\t"+data.getFprint()+"\t"+data.getFid()+"\t"); list.remove(data); // problem is here count++; } } } }
Solution
When iterating over them, you can't operate in the list (add, delete... Items) You must use iterators
for(Iterator<EmpDedup> iter = list.iterator(); iter.hasNext();) { EmpDedup data = iter.next(); if (data.getRecord() == rec1) { iter.remove(); } }
see http://docs.oracle.com/javase/6/docs/api/java/util/Iterator.html
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