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Interface shouldn't have private methods

Any method declared in Interface must on private or protected, because this method has to be implemented later on. You are only allowed to use public and abstract access modifier in interface.

Interface cannot have private methods, as the methods in an interface needs to be overridden by the class that is implementing the interface. But declaring a method as private makes in inaccessible outside the class thus not allowing a proper definition.

Interface can have only public and abstract method and final variable.
these method is override by those class which will going to implement that interface.

Interface methods should be public

There is only one wrong statement:

void myMethod();

Interface methods are implicitly public and abstract, and you cannot declare an interface method private because you have to implement that method in your class.

private void myMethod3();

Interface methods can't be private.

Interface can have either public or package protected methods.

interface doen`t have private methods
so error at private void myMethod3();

Interface method can't me private.

interface must contain public static final variable ..

interface must contain public static final membars

Interface method can't be private. Only public or abstract modifiers allowed to define in interface method definition.

interface cannot contain private,static final method.
so wrong one is private void myMethod3();

Interface should be declared as public