下列哪些表达式返回的是true（）。A、"john"=="john"B、"john".equals（"john"）C、"john"="john"D、"john".equals（newButton（"john"））
下列哪些表达式返回的是true（）。
- A、"john"=="john"
- B、"john".equals（"john"）
- C、"john"="john"
- D、"john".equals（newButton（"john"））
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