Command Line Argument in Java

The java command-line argument is a parameter that is passed to the java program when it is run.

The arguments passed from the console can be received and used as input in the Java program.

As a result, it provides a convenient way to check the program’s behavior for various values.

We can pass any number of arguments because the argument type is an array.

 Example of command-line argument in java:

class CommandLineExample{  
public static void main(String args[]){  
System.out.println("Your first argument is: "+args[0]);  
}  
}  

1. compile by > javac CommandLineExample.java  
2. run by > java CommandLineExample Coderzy

Output: Your first argument is: Coderzpy

Prints all the values using command-line argument:

class A{  
public static void main(String args[]){  
  
for(int i=0;i<args.length;i++)  
System.out.println(args[i]);  
  
}  
}  

1. compile by > javac A.java  
2. run by > java A Coderzy JAVA-CODE 1 3 hello

Output: Coderzy
       JAVA-CODE
       1
       3
       hello

Java System.exit() Method:

The java.lang.System class contains the exit() method. The System class’s exit() method kills the current Java virtual machine on the system. The status code is passed as an argument to this method. This method is used to exit or terminate a program that is currently running. It can have a value of zero or non-zero. Successful termination is indicated by exit(0), while unsuccessful termination is indicated by exit(1) or exit(-1). There is no value returned by the exit() method.

Example:

import java.lang.*;  
public class SystemExitExample1 {  
  
    public static void main(String[] args) {  
        int a[]= {9,8,7,6,5,4,3,2,1};  
        for(int i=0;i<a.length;i++)  
        {  
            if(a[i]>5)  
            {  
            System.out.println("array["+i+"]="+a[i]);  
            }  
            else  
            {  
                System.out.println("terminating jvm,exiting");  
                System.exit(0);//Treminatejvm  
            }  
        }  
    }  
}  

Output:

array[0]=9
array[1]=8
array[2]=7
array[3]=6
terminating jvm,exiting

Note: also read about the Java object creation methods

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