OnJava8-Examples/polymorphism/FieldAccess.java at master · CSapprenticeWT/OnJava8-Examples · GitHub

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// polymorphism/FieldAccess.java

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

// Direct field access is determined at compile time

class Super {

public int field = 0;

public int getField() { return field; }

}

class Sub extends Super {

public int field = 1;

@Override public int getField() { return field; }

public int getSuperField() { return super.field; }

}

public class FieldAccess {

public static void main(String[] args) {

Super sup = new Sub(); // Upcast

System.out.println("sup.field = " + sup.field +

", sup.getField() = " + sup.getField());

Sub sub = new Sub();

System.out.println("sub.field = " +

sub.field + ", sub.getField() = " +

sub.getField() +

", sub.getSuperField() = " +

sub.getSuperField());

}

/* Output:

sup.field = 0, sup.getField() = 1

sub.field = 1, sub.getField() = 1, sub.getSuperField()

= 0