How to Replace All Occurrences of a Substring in a String in Java - Step by Step Examples

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How to Replace All Occurrences of a Substring in a String in Java ?

Answer

To replace all occurrences of a substring in a string in Java, you can use the replaceAll method of the String class.

✐ Examples

1 Replacing Substring "Hello" with "Hi"

In this example,

We create a string named str.
We call the replaceAll method on str with the regex pattern to be replaced and the replacement string as arguments.
The replaceAll method returns a new string with all occurrences of the substring replaced.
Finally, we print the modified string.

Java Program

public class Main {
    public static void main(String[] args) {
        String str = "Hello World Hello";
        String newStr = str.replaceAll("Hello", "Hi");
        System.out.println(newStr);
    }
}

Output

Hi World Hi

2 Replacing Character 'o' with 'X'

In this example,

We create a string named str.
We call the replaceAll method on str with the regex pattern to be replaced and the replacement string as arguments.
The replaceAll method returns a new string with all occurrences of the substring replaced.
Finally, we print the modified string.

Java Program

public class Main {
    public static void main(String[] args) {
        String str = "Hello World Hello";
        String newStr = str.replaceAll("o", "X");
        System.out.println(newStr);
    }
}

Output

HellX WXrld HellX

Summary

In this tutorial, we learned How to Replace All Occurrences of a Substring in a String in Java language with well detailed examples.

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How to Replace All Occurrences of a Substring in a String in Java - Step by Step Examples

How to Replace All Occurrences of a Substring in a String in Java ?

Answer

✐ Examples

1 Replacing Substring "Hello" with "Hi"

Java Program

Output

2 Replacing Character 'o' with 'X'

Java Program

Output

Summary

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