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A cross-certificate is a certificate issued by one Certificate Authority (CA) that signs the public key for the root certificate of another Certificate Authority. Cross-certificates provide a means to create a chain of trust from a single, trusted, root CA to multiple other CAs.
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Does java class must have public method?
no you can have a class with no public methods and even with a a private constructor public class Example { //constructor private Example(){ } }
Can an inner class be creatd?
Yes. public class My { public class Wallet { } } //To create one My.Wallet billFolder = new My.Wallet();
What happens if a constructor is not defined in class?
Nothing happens. The compiler successfully compiles the class. When a class does not have a specific constructor, the compiler places a default no argument construtor in the class and allows you to compile and execute the class. public class Test { } and public class Test { public Test(){ } } are one and the same.
What is the valid class declaration header for the derived class d with base classes b1 and b2 A class d public b1 public b2 B class d class b1 class b2 C class d public b1 b2 D class d b1 b2?
What is the valid class declaration header for the derived class d with base classes b1 and b2?A. class d : public b1, public b2 {/*...*/};B. class d : class b1, class b2 {/*...*/};C. class d : public b1, b2 {/*...*/};D. class d : b1, b2 {/*...*/};The answer is A, C and D.B is not valid because "class" is not a valid access specifier.All the others are valid because private access is the default when the access specifier is omitted. Note that if class D were declared using the struct prefix, inheritance would default to public access rather than private.
The name of a Java program file must match the name of the class with the extension java?
not exactly..... only If your class is public then the java program name should be the public class name with extension Sample.java >> public class Sample { public static void main(String[] args) { ..... } } NonPublicClass.java class SomeOtherName { ......... }
