I hope the following will clarify your doubts:
class SuperA {
void superMeth1() {
System.out.println("superMeth1");
}
void superMeth2() {
System.out.println("superMeth2");
}
}
class Sub1 extends SuperA {
void superMeth1() {
System.out.println("superMeth1_sub1");
}
void sub1Meth1() {
System.out.println("subMeth1");
}
}
public class Main {
public static void main(String[] args) {
SuperA obj = new SuperA();
obj.superMeth1(); // Prints superMeth1
obj.superMeth2(); // Prints superMeth2
obj = new Sub1();
obj.superMeth1(); // Prints superMeth1_sub1
//obj.sub1Meth1(); // Compilation error as SuperA does not know about Sub1
((Sub1) obj).sub1Meth1(); // Prints subMeth1 because of the cast
Sub1 sub1 = new Sub1();
sub1.superMeth1(); // Prints superMeth1_sub1
sub1.sub1Meth1(); // Prints subMeth1
}
}
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