The class contains a field and a method with the same name.
It is confusing to have a member field and a method with the same name. It makes it easy for a programmer to accidentally call the method when attempting to access the field or vice versa.
Example 1:
public class Totaller {
private int total;
public int total() {
...
}
}
[1] Standards Mapping - Common Weakness Enumeration - (CWE) CWE ID 398