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Convert char to String in Java
Last updated: August 22, 2023
1. Introduction
Converting char to String instances is a very common operation. In this article, we will show multiple ways of tackling this situation.
2. String.valueOf()
The String class has a static method valueOf() that is designed for this particular use case. Here you can see it in action:
@Test
public void givenChar_whenCallingStringValueOf_shouldConvertToString() {
char givenChar = 'x';
String result = String.valueOf(givenChar);
assertThat(result).isEqualTo("x");
}
3. Character.toString()
The Character class has a dedicated static toString() method. Here you can see it in action:
@Test
public void givenChar_whenCallingToStringOnCharacter_shouldConvertToString() {
char givenChar = 'x';
String result = Character.toString(givenChar);
assertThat(result).isEqualTo("x");
}
4. Character’s Constructor
You could also instantiate Character object and use a standard toString() method:
@Test
public void givenChar_whenCallingCharacterConstructor_shouldConvertToString() {
char givenChar = 'x';
String result = new Character(givenChar).toString();
assertThat(result).isEqualTo("x");
}
5. Implicit Cast to String Type
Another approach is to take advantage of widening conversion via type casting:
@Test
public void givenChar_whenConcatenated_shouldConvertToString() {
char givenChar = 'x';
String result = givenChar + "";
assertThat(result).isEqualTo("x");
}
6. String.format()
Finally, you can use the String.format() method:
@Test
public void givenChar_whenFormated_shouldConvertToString() {
char givenChar = 'x';
String result = String.format("%c", givenChar);
assertThat(result).isEqualTo("x");
}
7. Conclusion
In this article, we explored multiple ways of converting char instances to String instances.
All code examples can be found in the GitHub repository.