resources.report.rules.pmd.MissingStaticMethodInNonInstantiatableClass.html Maven / Gradle / Ivy

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MissingStaticMethodInNonInstantiatableClass


MissingStaticMethodInNonInstantiatableClass
A class that has private constructors and does not have any static methods or fields cannot be used.
      
		
		
		    
    			This rule is defined by the following XPath expression:
    			
    			
        
//ClassOrInterfaceDeclaration[@Nested='false'][
( count(./ClassOrInterfaceBody/ClassOrInterfaceBodyDeclaration/ConstructorDeclaration)&gt;0
  and count(./ClassOrInterfaceBody/ClassOrInterfaceBodyDeclaration/ConstructorDeclaration) = count(./ClassOrInterfaceBody/ClassOrInterfaceBodyDeclaration/ConstructorDeclaration[@Private='true']) )
and
count(.//MethodDeclaration[@Static='true'])=0
and
count(.//FieldDeclaration[@Private='false'][@Static='true'])=0
]
    
              
  
		    
		    
	    
	    
        
        
        Example:
            
                    

/* This class is unusable, since it cannot be
 instantiated (private constructor),
 and no static method can be called.
 */
public class Foo {
 private Foo() {}
 void foo() {}
}