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Sanity4J was created to simplify running multiple static code analysis tools on the Java projects. It provides a single entry point to run all the selected tools and produce a consolidated report, which presents all findings in an easily accessible manner.

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UseCollectionIsEmpty

UseCollectionIsEmpty

The isEmpty() method on java.util.Collection is provided to determine if a collection has any elements. Comparing the value of size() to 0 does not convey intent as well as the isEmpty() method.
This rule is defined by the following Java class: net.sourceforge.pmd.lang.java.rule.design.UseCollectionIsEmptyRule
Example(s):


    
public class Foo {
	void good() {
       	List foo = getList();
		if (foo.isEmpty()) {
			// blah
		}
   	}

    void bad() {
   	    List foo = getList();
			if (foo.size() == 0) {
				// blah
			}
    	}
}