Illegal modifier for parameter ... only final is permitted

A local variable, i.e., method level variable or a parameter cannot be declared as static or public/private/protected. So local variables must be declared without these modifiers. For example, the following code is wrong:     void methodA(static int param) {         System.out.println(param);     }     void methodB(private int param) {  ...

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The constructor ... is not visible

When you invoke the private constructor of a class in another class, you’ll get the error message “The constructor ... is not visible”. And when the private constructor of a super class is invoked from the subclass implicitly or explicitly, you’ll get the following: Implicit super constructor ... is not visible for default constructor. Must define an explicit constructor. Implicit super constructor...

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attempting to assign weaker access privileges

Java error "attempting to assign weaker access privileges" can happen when we override a superclass method in the subclass if the access modifier is not correctly chosen. See the sample code below: public class SuperClass { public void display() { System.out.println("this is super class"); } } public class Subclass extends SuperClass { private void display() { System.out.println("this...

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modifier private not allowed here

Java error "modifier private not allowed here" can occur for any of the following reasons: 1. An outer class declared as private like below: private class OuterClass {     //... }An outer class only be public or package private not private or protected. So you can write an outer class as below: public class OuterClass {    //... }or class OuterClass {    //... }This...

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