The formal Java Language Specification does not list a hard limit on the number of formal parameters allowed. Generally, if you're worried that you might "run out" of parameter spaces, you will probably want to redesign your method.
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yes we can define a variable in an interface in java.
I don't understand what you mean with "default by true"? Please clarify your question. A Java method can have zero or more parameters, and it must have one return value. Any of these can be declared as "boolean", in which case the value can be either true or false.
A method in java can declare only one return value and type at a time. For ex: a single method cannot have a code that returns a string in some cases and an integer in other cases. Java compiler does not let you do that. You can only have one return type for every method in java.
Because, the main method is the starting point of the java program and if we need an object of that class even before the main can be invoked, it is not possible. Hence it is declared static so that the JVM Can acess the main method without having to instantiate that particular class
Java does not support direct multiple inheritance. You can implement partial multiple inheritance using interfaces. ex: public class ExMultInherit implements interface1, interface2, interface 3 { ... .... ...... }