How to use if/else with parseint

[asai]

Hi,
A small problem that I have tried a few alternatives to solve.

Here is the code:

public class testIfElse {
	public static void main(String[] argv) {
		
		String cstring;
		cstring = "123456";
		if (cstring != "")
		{
			int credit = Integer.parseInt(cstring);
		}else{
			int credit = 0;
		}
		System.out.println(credit);
	}
}

If the string is not blank, print out the result as a Int.
If the string is blank, print a zero.
How can I do this?

[KevinWorkman]

Don't use == (or !=) with String. Use the equals() method instead. This has been discussed in great detail on these forums and on the internet, so I recommend doing a search of something like "using == with Objects".

[asai]

I have tried this also:

public class testIfElse {
	public static void main(String[] argv) {
		String cstring = "123456";
		if (!"".equals(cstring))
		{
			int credit = Integer.parseInt(cstring);
		}else{
			int credit = 0;
		}
		System.out.println(credit);
	}
}

The error is this: "credit cannot be resolved to a variable"

[JosAH]

... also don't define local variables 'credit' in both the if-part as well as the else-part; they are different variables and above all, they'll be gone after that if-else statement has finishe executing; the remedy is simple: define it before your if-else statement.

kind regards,

Jos

[asai]

Sorry for that really stupid question. It was so obvious!!

Here is the correct code:

public class testIfElse {
	public static void main(String[] argv) {
		String cstring = "123456";
		int credit;
		if (!"".equals(cstring))
		{
			credit = Integer.parseInt(cstring);
		}else{
			credit = 0;
		}
		System.out.println(credit);
	}
}