Java Language
- Getting started with Java Language
- Top 10 Java Errors with Solutions
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- Java Pitfalls - Language syntax
- Pitfall - Declaring classes with the same names as standard classes
- Pitfall - Ignoring method visibility
- Pitfall - Leaving out braces: the "dangling if" and "dangling else" problems
- Pitfall - Misplaced semicolons and missing braces
- Pitfall - Missing a ‘break’ in a 'switch' case
- Pitfall - Octal literals
- Pitfall - Overloading instead of overriding
- Pitfall - Using '==' to test a boolean
- Pitfall - Wildcard imports can make your code fragile
- Pitfall of Auto-Unboxing Null Objects into Primitives
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Java Language Java Pitfalls - Language syntax Pitfall - Octal literals
Example
Consider the following code snippet:
// Print the sum of the numbers 1 to 10
int count = 0;
for (int i = 1; i < 010; i++) { // Mistake here ....
count = count + i;
}
System.out.println("The sum of 1 to 10 is " + count);
A Java beginner might be surprised to know that the above program prints the wrong answer. It actually prints the sum of the numbers 1 to 8.
The reason is that an integer literal that starts with the digit zero ('0') is interpreted by the Java compiler as an octal literal, not a decimal literal as you might expect. Thus, 010 is the octal number 10, which is 8 in decimal.
