CODEWITHSUNDEEP
javaarrayslistarraylist
tousif ahmed
tousif ahmed

Reputation: 11

comparing ArrayList of Strings with Array of Strings

i am trying to compare array list of string with array of string by using .equal but its not working i am trying to remove element from array list if it is equal to arrays element every time it is executing if part and not removing element from array list

    public ArrayList removeCommonWords(ArrayList<String> fileTokens){
    System.err.println("size of arraylist: \t"+fileTokens.size()+"\t size of array: \t"+stoppingWordsGlobal.length);
    for(int i=0;i<fileTokens.size();i++){
        for (int j=0;j<stoppingWordsGlobal.length;j++) {
            if (fileTokens.get(i).equals(stoppingWordsGlobal[j])) {
                fileTokens.remove(i);
                System.out.print("\nremoving token number :"+"\t"+i+"\t"+fileTokens.get(i)+"\t"+stoppingWordsGlobal[j]);
            }
        } 
    }
    return fileTokens;
}

Upvotes: 0

Views: 688

Answers (2)

ShellFish
ShellFish

Reputation: 4551

Convert the String[] stringArray to an ArrayList<String>:

ArrayList<String> strings = new ArrayList<>(Arrays.asList(stringArray));

Then simply remove shared content from the original list:

originalList.removeAll(strings);

Or in one line (untested):

originalList.removeAll(new ArrayList<String>(Arrays.asList(stringArray));

Upvotes: 1

Sonu Gupta
Sonu Gupta

Reputation: 367

Try this:

main method code:

ArrayList<String> list= new ArrayList<String>();
      list.add("angularjs");
      list.add("javascript");
      list.add("java");
      list.add("c");

     Test test= new Test();
     System.out.println(test.removeCommonWords(list));

your method:

String[] stoppingWordsGlobal={"nodejs","java","angularjs"};
    public ArrayList removeCommonWords(ArrayList<String> fileTokens){
        System.err.println("size of arraylist: \t"+fileTokens.size()+"\t size of array: \t"+stoppingWordsGlobal.length);
        for(int i=0;i<fileTokens.size();i++){
            for (int j=0;j<stoppingWordsGlobal.length;j++) {
                if (fileTokens.get(i).equals(stoppingWordsGlobal[j])) {
                    String removedString=fileTokens.get(i);
                    fileTokens.remove(i);
                    System.out.print("\nremoving token number :"+"\t"+i+"\t"+removedString+"\t"+stoppingWordsGlobal[j]);
                }
            } 
        }
        return fileTokens;
    }

output is:

size of arraylist: 4 size of array: 3

removing token number : 0 angularjs angularjs

removing token number : 1 java java

Upvotes: 0

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