String[] in Java
-
Use
String[]While Declaring the Main Method in Java -
Use
String[]to Create an Array of Strings in Java
![String[] in Java](/img/Java/ag-feature-image---java-string.webp)
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.
Sheeraz is a Doctorate fellow in Computer Science at Northwestern Polytechnical University, Xian, China. He has 7 years of Software Development experience in AI, Web, Database, and Desktop technologies. He writes tutorials in Java, PHP, Python, GoLang, R, etc., to help beginners learn the field of Computer Science.
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