How to check if a Vector contains all the items of Another Vector in Java - Step by Step Examples

How to check if a Vector contains all the items of Another Vector in Java ?

Answer

To check if a vector contains all the items of another vector in Java, you can use the containsAll method of the Vector class.

✐ Examples

1 Check if All Elements of One Vector are in Another Vector

In this example,

We import the necessary classes: java.util.Vector for working with vectors.
We create a Vector named vec1 and add a set of numerical values to it using the add method.
We create another Vector named vec2 and add a different set of numerical values to it using the add method.
We use the containsAll method of vec1 to check if all elements of vec2 are present in vec1. The containsAll method returns true if vec1 contains all the elements of vec2, otherwise it returns false.
Finally, we print the result to standard output using System.out.println.

Java Program

import java.util.Vector;

public class Main {
    public static void main(String[] args) {
        Vector<Integer> vec1 = new Vector<>();
        vec1.add(1);
        vec1.add(2);
        vec1.add(3);
        vec1.add(4);
        vec1.add(5);
        
        Vector<Integer> vec2 = new Vector<>();
        vec2.add(2);
        vec2.add(3);
        vec2.add(4);
        
        boolean result = vec1.containsAll(vec2);
        System.out.println(result);
    }
}

Output

true

2 Check if All Elements of Another Vector are in the First Vector

In this example,

We import the necessary classes: java.util.Vector for working with vectors.
We create a Vector named mainVec and add a series of string values to it using the add method.
We create another Vector named subVec and add a subset of string values to it using the add method.
We use the containsAll method of mainVec to check if all elements of subVec are present in mainVec. The containsAll method returns true if mainVec contains all the elements of subVec, otherwise it returns false.
Finally, we print the result to standard output using System.out.println.

Java Program

import java.util.Vector;

public class Main {
    public static void main(String[] args) {
        Vector<String> mainVec = new Vector<>();
        mainVec.add("apple");
        mainVec.add("banana");
        mainVec.add("cherry");
        mainVec.add("date");
        mainVec.add("fig");
        
        Vector<String> subVec = new Vector<>();
        subVec.add("banana");
        subVec.add("cherry");
        subVec.add("date");
        
        boolean result = mainVec.containsAll(subVec);
        System.out.println(result);
    }
}

Output

true

3 Check if All Elements of a Subset Vector are in the Main Vector

In this example,

We import the necessary classes: java.util.Vector for working with vectors.
We create a Vector named primaryVec and add a list of mixed data types including numbers and strings to it using the add method.
We create another Vector named secondaryVec and add some elements that are not present in primaryVec using the add method.
We use the containsAll method of primaryVec to check if all elements of secondaryVec are present in primaryVec. The containsAll method returns true if primaryVec contains all the elements of secondaryVec, otherwise it returns false.
Since not all elements of secondaryVec are in primaryVec, the containsAll method returns false.
Finally, we print the result to standard output using System.out.println.

Java Program

import java.util.Vector;

public class Main {
    public static void main(String[] args) {
        Vector<Object> primaryVec = new Vector<>();
        primaryVec.add(10);
        primaryVec.add(20);
        primaryVec.add(30);
        primaryVec.add("apple");
        primaryVec.add("banana");
        
        Vector<Object> secondaryVec = new Vector<>();
        secondaryVec.add(20);
        secondaryVec.add("banana");
        secondaryVec.add("cherry");
        
        boolean result = primaryVec.containsAll(secondaryVec);
        System.out.println(result);
    }
}

Output

false

Summary

In this tutorial, we learned How to check if a Vector contains all the items of Another Vector in Java language with well detailed examples.

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