Java Program for Multiplication of Command Line Integer Arguments

Java Program for Product of Command Line Integer Arguments

Reads command line integer arguments and computes the multiplication of them.

To convert string to integer, Integer.parseInt method is used here.

class MultiplicationTest {
	public static void main(String[] values) {
		int product = 1;
		System.out.println("Calculates Multiplication for below Integers");
		
		for(int i=0;i<values.length;i++){
			System.out.println(values[i]);
			product = product * Integer.parseInt(values[i]);
		}
		System.out.println("Multiplication :" + product);
		
	}
}

D:\Java_Programs>javac MultiplicationTest.java
D:\Java_Programs>java MultiplicationTest  2 3 4 5 6 
Calculates Multiplication for below Integers
2
3
4
5
6
Multiplication :720

Invalid Command Line Integer Arguments

If we pass invalid integer value as command line arguments, above java program fails to calculate the multiplication and throws exception.

D:\Java_Programs>javac MultiplicationTest .java
D:\Java_Programs>java MultiplicationTest  2 3 4 5 6 Test

Exception in thread "main" Test
java.lang.NumberFormatException: For input string: "Test"
	at java.lang.NumberFormatException.forInputString(Unknown Source)
	at java.lang.Integer.parseInt(Unknown Source)
	at java.lang.Integer.parseInt(Unknown Source)
	at SumTest.main(SumTest.java:7)

Java Program for Multiplication of Command Line Arguments Excluding Invalid Values

try catch block is used to find the invalid command line integer arguments and finds the multiplication for remaining valid command line integer arguments.

class MultiplicationTest {
	public static void main(String[] values) {
		int product = 1;
		System.out.println("Calculates Multiplication for below Integers");
		
		for(int i=0;i<values.length;i++){
			System.out.println(values[i]);
			try {
				product = product * Integer.parseInt(values[i]);
			} catch (NumberFormatException e) {
			System.out.println("Invalid integer command line arguments: " + e.toString());
			}
		}
		System.out.println("Multiplication :" + product);
		
	}
}

D:\Java_Programs>javac MultiplicationTest.java
D:\Java_Programs>java MultiplicationTest 2 3 4 5 6 Test
Calculates Multiplication for below Integers
2
3
4
5
6
Test
Invalid integer command line arguments: java.lang.NumberFormatException: For input string: "Test"
Multiplication :720