How to Convert a Set of Strings to a Set of Integers in Java - Step by Step Examples

How to Convert a Set of Strings to a Set of Integers in Java ?

Answer

In Java, you can convert a set of strings to a set of integers by iterating over each element of the string set and converting it to an integer using the parseInt() method of the Integer class.

✐ Examples

1 Convert a Set of Strings to a Set of Integers using parseInt() Method

In this example,

We have a set of strings named stringSet1 containing the elements "1", "2", "3", "4", "5".
We create an empty set named intSet1.
We iterate over each element of stringSet1 using a for-each loop.
Inside the loop, we convert each string element to an integer using the parseInt() method of the Integer class and add it to the intSet1.
We print the resulting intSet1 to standard output.

Java Program

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Set<String> stringSet1 = new HashSet<>(Arrays.asList("1", "2", "3", "4", "5"));
        Set<Integer> intSet1 = new HashSet<>();

        for (String str : stringSet1) {
            intSet1.add(Integer.parseInt(str));
        }

        System.out.println("Converted int set: " + intSet1);
    }
}

Output

Converted int set: [1, 2, 3, 4, 5]

2 Convert a Set of Strings to a Set of Integers using valueOf() Method

In this example,

We have a set of strings named stringSet2 containing the elements "10", "20", "30", "40", "50".
We create an empty set named intSet2.
We iterate over each element of stringSet2 using a for-each loop.
Inside the loop, we convert each string element to an integer using the valueOf() method of the Integer class and add it to the intSet2.
We print the resulting intSet2 to standard output.

Java Program

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Set<String> stringSet2 = new HashSet<>(Arrays.asList("10", "20", "30", "40", "50"));
        Set<Integer> intSet2 = new HashSet<>();

        for (String str : stringSet2) {
            intSet2.add(Integer.valueOf(str));
        }

        System.out.println("Converted int set: " + intSet2);
    }
}

Output

Converted int set: [50, 20, 40, 10, 30]

Summary

In this tutorial, we learned How to Convert a Set of Strings to a Set of Integers in Java language with well detailed examples.

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How to Convert a Set of Strings to a Set of Integers in Java - Step by Step Examples

How to Convert a Set of Strings to a Set of Integers in Java ?

Answer

✐ Examples

1 Convert a Set of Strings to a Set of Integers using parseInt() Method

Java Program

Output

2 Convert a Set of Strings to a Set of Integers using valueOf() Method

Java Program

Output

Summary

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