Java - contains check all items in an arraylist meet a condition

Question

myArrayList = {"Method and apparatus","system and method for the same","drive-modulation method"," METHOD FOR ORTHOGONAL"}

How can i check if all the Items (myArrayList) contains a word "method" (irrespective of case)

boolean method return true if all the items contain the word, else its false

Answer 1

In Java8, you can use stream with matching to simplify your code.

 return arrayList.stream().allMatch(t -> t.toLowerCase().contains("test"));

Answer 2

Iterate and use contains. Remove the or conditions if you want case specific.

   public static boolean isListContainMethod(List<String> arraylist) {
    for (String str : arraylist) {
        if (!str.toLowerCase().contains("method")) {
            return false;
        }
    }
    return true;
}

Answer 3

    public boolean listContainsAll(List<String> list) {
    for (String item : list) {
        if (!item.toLowerCase().contains("method")) {
            return false;
        }
    }

    return true;
}

Answer 4

Simple loop checking condition, added white chars for avoiding wrong words as 'somewordmethod':

    boolean result = true;
    for (String elem : yourList) {
        if (!elem.toLowerCase().contains(" method ")) {
            result = false;
            break;
        }
    }
    return result;


 return result;

Answer 5

You will have to check for the whole arraylist and return false if there is a string without that word.

public static void main(String[] args) {
ArrayList<String> list = new ArrayList();
list.add("I have the name");
list.add("I dont have the number");
list.add("I have a car");
System.out.println(check(list, "I"));
}

private static boolean check(ArrayList<String> list, String word) {
// TODO Auto-generated method stub
for(String s : list)
if(!list.contains(word))
    return false;
return true;
}

Answer 6

ArrayList implements the List Interface.

If you look at the Javadoc for List at the contains method you will see that it uses the equals() method to evaluate if two objects are the same.

int tempCount = 0;
for (String str : arraylist) {
    if(str.conatains("method") || str.conatains("Method")) {
        tempCount++;
    }    
}

if(tempCount == arraylist.size()) {
    return true;
} else {
    return false;
}