Web Reference: Aug 2, 2022 · Private method can be used only inside interface and other static and non-static interface methods. Private non-static methods cannot be used inside private static methods. In Java 7 and all earlier versions, interfaces were very simple. They could only contain public abstractmethods. These interface methods MUST be implemented by classes which choose to implement the interface. Feb 4, 2026 · To solve the problem, Java 9 helps by allowing private methods inside interfaces. A private method in an interface cannot be called outside the interface and can only be used inside default or static methods of the same interface.
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