Java LinkedList contains() method với ví dụ cụ thể

LinkedList contains() sử dụng để kiểm tra sự tồn tại của phần tử trong LinkedList.

public boolean contains(Object element)

Trả về true nếu tìm thấy, false nếu phần tử không chứa trong LinkedList.

import java.util.ArrayList;

public class Main {
    public static void main(String[] args) {

        ArrayList<String> al = new ArrayList<String>();
        al.add("pen");
        al.add("pencil");
        al.add("ink");
        al.add("notebook");

        System.out.println("LinkedList contains the string 'ink pen': "
                + al.contains("ink pen"));
        System.out.println("LinkedList contains the string 'pen': "
                + al.contains("pen"));
        System.out.println("LinkedList contains the string 'pencil': "
                + al.contains("pencil"));
        System.out.println("LinkedList contains the string 'book': "
                + al.contains("book"));

        ArrayList<Integer> al2 = new ArrayList<Integer>();
        al2.add(1);
        al2.add(99);
        al2.add(56);
        al2.add(13);
        al2.add(44);
        al2.add(6);

        System.out.println("'1' is present in arraylist: " + al2.contains(1));
        System.out.println("'55' is present in arraylist: " + al2.contains(55));
        System.out.println("'44' is there in arraylist: " + al2.contains(44));
        System.out.println("'7' is there in arraylist: " + al2.contains(7));
    }
}

Output: 

LinkedList contains the string ‘ink pen’: false
LinkedList contains the string ‘pen’: true
LinkedList contains the string ‘pencil’: true
LinkedList contains the string ‘book’: false
‘1’ is present in arraylist: true
’55’ is present in arraylist: false
’44’ is there in arraylist: true
‘7’ is there in arraylist: false

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