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Coding

How to Ignore in Java

1. Ignoring Files in Version Control

If you’re using Git you can create a .gitignore file in your project’s root directory. This file specifies which files or directories Git should ignore.

Example .gitignore contents:

*.class
*.log
.settings/
target/

This ignores all .class files, log files, the .settings directory and the target directory.

2. Ignoring Test Cases

To ignore a specific test case in JUnit use the @Ignore annotation:

import org.junit.Ignore;
import org.junit.Test;

public class MyTest {
@Ignore("This test is not ready yet")
@Test
public void testNotReadyYet() {
// Test code here
}
}

3. Ignoring Compiler Warnings

To suppress specific compiler warnings use the @SuppressWarnings annotation:

@SuppressWarnings("unchecked")
public void methodWithUncheckedWarning() {
// Method implementation
}

4. Ignoring Exceptions

Sometimes you will probably want to catch an exception, but not do anything with it:

try {
// Some code that throws an exception
} catch (SomeException e) {
// Intentionally empty to ignore the exception
}

It’s definitely better to at least log the exception so remember that:

try {
// Some code that might throw an exception
} catch (SomeException e) {
logger.warn("Exception occurred", e);
}

5. Ignoring Unused Variables

If you have a variable that you need to declare but don’t use, prefix it with an underscore to indicate it is intentionally unused:

public void someMethod(String _unusedParam) {
// Method implementation
}

6. Ignoring IDE Warnings

Most IDEs allow you to suppress specific warnings. In IntelliJ IDEA for example you can use:

@SuppressWarnings("IntelliJ-specific-warning")

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