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In this quick article, we’re going to look at different ways to convert an array of strings or integers to a string.
Using Arrays.toString() method
Arrays.toString() returns a string with the content of the input array. The new string created is a comma-delimited list of the array’s elements, surrounded with square brackets (“[]”):
// Using Arrays.toString()
public static String convertArrayToString(String[] strArray) {
return Arrays.toString(strArray);
}
Output:
[one, two, three]Using StringBuilder.append() method
Let's use StringBuilder.append() method to convert from Array to String:
// using StringBuilder.append()
public static String convertArrayToStringMethod(String[] strArray) {
StringBuilder stringBuilder = new StringBuilder();
for (int i = 0; i < strArray.length; i++) {
stringBuilder.append(strArray[i]);
}
return stringBuilder.toString();
}
Output:
onetwothreeUsing String.join() method
Java 8 and above offers the String.join() method that produces a new string by joining elements and separating them with the specified delimiter, in our case just empty string:
// Using String.join() method
public static String convertArrayToStringUsingStreamAPI(String[] strArray) {
String joinedString = String.join(" ", strArray);
return joinedString;
}
Output:
one two threeUsing Collectors.joining() method from the Java Streams AP
// Using Stream API and Collectors
public static String convertArrayToStringUsingCollectors(String[] strArray) {
String joinedString = Arrays.stream(strArray)
.collect(Collectors.joining());
return joinedString;
}
Output:
onetwothreeComplete Example
package corejava;
import java.util.Arrays;
import java.util.stream.Collectors;
public class ArrayToStringConvertExample {
public static void main(String[] args) {
String[] strArray = {
"one",
"two",
"three"
};
System.out.println(convertArrayToString(strArray));
System.out.println(convertArrayToStringMethod(strArray));
System.out.println(convertArrayToStringUsingStreamAPI(strArray));
System.out.println(convertArrayToStringUsingCollectors(strArray));
// convert string to array
String[] strArray1 = "javaguides".split(" ");
}
// Using Arrays.toString()
public static String convertArrayToString(String[] strArray) {
return Arrays.toString(strArray);
}
// using StringBuilder.append()
public static String convertArrayToStringMethod(String[] strArray) {
StringBuilder stringBuilder = new StringBuilder();
for (int i = 0; i < strArray.length; i++) {
stringBuilder.append(strArray[i]);
}
return stringBuilder.toString();
}
// Using String.join() method
public static String convertArrayToStringUsingStreamAPI(String[] strArray) {
String joinedString = String.join(" ", strArray);
return joinedString;
}
// Using Stream API and Collectors
public static String convertArrayToStringUsingCollectors(String[] strArray) {
String joinedString = Arrays.stream(strArray)
.collect(Collectors.joining());
return joinedString;
}
}
Output:
[one, two, three]
onetwothree
one two three
onetwothree
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