Which of the following statements are true？（）
A: The equals（） method determines if reference values refer to the same object.
B: The == operator determines if the contents and type of two separate objects match.
C: The equals（） method returns true only when the contents of two objects match.
D: The class File overrides equals（） to return true if the contents and type of two separate objects match.
A: The equals（） method determines if reference values refer to the same object.
B: The == operator determines if the contents and type of two separate objects match.
C: The equals（） method returns true only when the contents of two objects match.
D: The class File overrides equals（） to return true if the contents and type of two separate objects match.
举一反三
- Given： Which statement is true？（） A: The equals method does NOT properly override the Object.equals method. B: Compilation fails because the private attribute p.name cannot be accessed in line 5. C: To work correctly with hash-based data structures,this class must also implement the hashCodemethod. D: When adding Person objects to a java.util.Set collection,the equals method in line 4 will preventduplicates.
- Three objects are brought close to one another, two at a time. When objects A and B are brought together, they attract. When objects B and C are brought together, they repel. Which of the following are necessarily true? A: Objects A and C possess charges of the same sign. B: Objects A and C possess charges of opposite sign. C: All three objects possess charges of the same sign. D: One object is neutral. E: Additional experiments must be performed to determine information about the charges on the objects.
- There are two identical batteries in series, which statement is true?( ) A: The total voltage equals the sum of the voltages of each battery. B: The total voltage equals any battery voltage. C: The total voltage equals half of one battery voltage
- Which of the following match is true?
- Match. Match the words with the definitions.