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Remove all objects in an arraylist that exist in another arraylist Java

Written By Kuswati Tuesday, 22 September 2020 Add Comment Edit

ArrayList<String> firstArr = new ArrayList<>();
  firstArr.add("1");
  firstArr.add("2");
  firstArr.add("3");
  
  // array/list to be removed from firstArr
  ArrayList<String> filterArr = new ArrayList<>();
  filterArr.add("1");
  filterArr.add("3");
  
  // filter now
  filterArr.removeAll(blockedArr);
  
  // Dump
  System.out.println(filterArr.toString); // output 1 and 3

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