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Java - replace first n characters in string
3 points
In this article, we would like to show you how to replace the first n characters in String in Java.
Quick solution:
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int n = 3;2
String text = "ABCD";3
String replacement = "xyz";4
String result = replacement + text.substring(n);5
6
System.out.println(result); // xyzDor:
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int n = 3;2
String text = "ABCD";3
String replacement = "xyz";4
String result = replacement.concat(text.substring(n));5
6
System.out.println(result); // xyzD
In this example, we remove last n characters from the original string and add the replacement at the beginning.
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public class Example {2
3
public static void main(String[] args) {4
5
int n = 3;6
String text = "ABCD";7
String replacement = "xyz";8
String result = replacement + text.substring(n);9
10
System.out.println(result); // xyzD11
}12
}This approach is equivalent to the above one. Instead of + operator, we concatenate the strings using concat() method.
xxxxxxxxxx1
public class Example {2
3
public static void main(String[] args) {4
5
int n = 3;6
String text = "ABCD";7
String replacement = "xyz";8
String result = replacement.concat(text.substring(n));9
10
System.out.println(result); // xyzD11
}12
}