detect, explain, and correct the errors in the code (Problems 1 - 4)

1: Point out the error(s) and how they can be fixed.

public class OOPExercises {

public static void main(String[] args) {

A objA = new A();

System.out.println("in main(): ");

System.out.println("objA.a = "+objA.a);

objA.a = 222;

}

}

public class A {

private int a = 100;

public void setA( int value) {

a = value;

}

public int getA() {

return a;

}

} //class A

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2: Point out the error(s) and how they can be fixed.

public class OOPExercises {

public static void main(String[] args) {

System.out.println("in main(): ");

System.out.println("objA.a = "+getA() );

setA(123);

}

}

public class A {

private int a = 100;

public void setA( int value) {

a = value;

}

public int getA() {

return a;

}

} //class A

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3: Point out the error(s) and how they can be fixed.

public class OOPExercises {

public static void main(String[] args) {

A objA = new A ();

double result;

result = objA.getA();

System.out.println("objA.a = "+ result);

}

}

public class A {

private int a = 100;

public void setA( int value) {

a = value;

}

public int getA() {

return a;

}

} //class A

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4: Point out the error(s) and how they can be fixed.

public class B extends A {

private int a = 222;

public static void main(String[] args) {

System.out.println("in main(): ");

System.out.println("a = "+a );

a = 123;

}

}

public class A {

private int a = 100;

public void setA( int value) {

a = value;

}

public int getA() {

return a;

}

} //class A