HOWTO · Java
String[] in Java
This tutorial demonstrates what String[] in Java is and how to use it.
On this page
String[] means an array holding a fixed number of strings in Java. The most common use of String[] is when we declare the main method like public static void main(String[] args).
This tutorial will demonstrate how to use String[] in Java.
Use String[] While Declaring the Main Method in Java
The main method invokes the code in Java. It is necessary to pass an array of strings as a parameter to the main method; otherwise, it will not work.
Example:
package delftstack;
public class String_Example {
public static void main(String[] args) {
System.out.println("This is String[] Example");
}
}
String[] args is passed as a parameter to the main method so that the code will run properly.
Output:
This is String[] Example
If the main method is not declared with the String[] parameter, the code will not run.
Example:
package delftstack;
public class String_Example {
public static void main(String args) {
System.out.println("This is String[] Example");
}
}
This code will not run because the main method is not declared with String[].
Output:
Error: Main method not found in class delftstack.String_Example, please define the main method as:
public static void main(String[] args)
or a JavaFX application class must extend javafx.application.Application
Use String[] to Create an Array of Strings in Java
As mentioned above, String[] is used to create arrays of strings.
Example:
package delftstack;
import java.util.Arrays;
public class String_Example {
public static void main(String[] args) {
// Two methods of array initialization
// Method 1
String[] Demo_Array1 = new String[] {"Delftstack1", "Delftstack2", "Delftstack3"};
// Method 2
String[] Demo_Array2 = {"Delftstack1", "Delftstack2", "Delftstack3"};
// Print the Arrays
System.out.println("String[] Array initialization method 1");
System.out.println(Arrays.toString(Demo_Array1));
System.out.println("String[] Array initialization method 2");
System.out.println(Arrays.toString(Demo_Array2));
// String[] Array initialization after declaration
String[] Demo_Array3 = new String[3];
Demo_Array3[0] = "Delftstack1";
Demo_Array3[1] = "Delftstack2";
Demo_Array3[2] = "Delftstack3";
System.out.println("String[] Array initialization after declaration");
System.out.println(Arrays.toString(Demo_Array3));
}
}
The code above creates String[] arrays using three different methods.
Output:
String[] Array initialization method 1
[Delftstack1, Delftstack2, Delftstack3]
String[] Array initialization method 2
[Delftstack1, Delftstack2, Delftstack3]
String[] Array initialization after declaration
[Delftstack1, Delftstack2, Delftstack3]
String[] is the most commonly used array type in Java for different operations.
