comparing ArrayList of Strings with Array of Strings

Question

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;
}

ShellFish · Accepted Answer · 2015-05-26 00:20:39Z

1

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));

edited May 26, 2015 at 0:20

answered May 25, 2015 at 18:29

ShellFish

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3 Comments

tousif ahmed Over a year ago

but the same code on the an other program is working fine.. i think its not necessary or it is?

ShellFish Over a year ago

No but it's shorter and easier.

tousif ahmed Over a year ago

you are checking two arrays are equal or not and i am asking how to remove elements from array list if any element of array is equal to element of array list

Sonu Gupta · Accepted Answer · 2015-05-25 19:07:11Z

0

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

answered May 25, 2015 at 19:07

Sonu Gupta

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2 Comments

tousif ahmed Over a year ago

i am doing already exactly this but it is not removing i mean if part is working every time either it is equal or not equal.......

Sonu Gupta Over a year ago

It is working fine from my side and returning the arraylist with removed elements. in your method ,you were trying to print the value after removing the element.

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