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821 Examples of Inheritance This section illustrates inheritance of class members through several examples 8211 Example: Inheritance with Default Access Consider the example where the points package declares two compilation units:
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package points; public class Point { int x, y; public void move(int dx, int dy) { x += dx; y += dy; } }
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package points;
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and a third compilation unit, in another package, is:
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import pointsPoint3d;
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class Point4d extends Point3d { int w; public void move(int dx, int dy, int dz, int dw) { x += dx; y += dy; z += dz; w += dw; // compile-time errors } }
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Here both classes in the points package compile The class Point3d inherits the elds x and y of class Point, because it is in the same package as Point The class Point4d, which is in a different package, does not inherit the elds x and y of class Point or the eld z of class Point3d, and so fails to compile A better way to write the third compilation unit would be:
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import pointsPoint3d; class Point4d extends Point3d { int w; public void move(int dx, int dy, int dz, int dw) { supermove(dx, dy, dz); w += dw; } }
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public class Point3d extends Point { int z; public void move(int dx, int dy, int dz) { x += dx; y += dy; z += dz; } }
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using the move method of the superclass Point3d to process dx, dy, and dz If Point4d is written in this way it will compile without errors 8212 Inheritance with public and protected Given the class Point:
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package points; public class Point { public int x, y;
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protected int useCount = 0;
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static protected int totalUseCount = 0;
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public void move(int dx, int dy) { x += dx; y += dy; useCount++; totalUseCount++; } }
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class Test extends pointsPoint { public void moveBack(int dx, int dy) { x -= dx; y -= dy; useCount++; totalUseCount++; } }
8213 Inheritance with private In the example:
class Point { int x, y;
void move(int dx, int dy) { x += dx; y += dy; totalMoves++; } private static int totalMoves;
the public and protected elds x, y, useCount and totalUseCount are inherited in all subclasses of Point Therefore, this test program, in another package, can be compiled successfully:
void printMoves() { Systemoutprintln(totalMoves); }
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class Point3d extends Point { int z; void move(int dx, int dy, int dz) { supermove(dx, dy); z += dz; totalMoves++; } }
8214 Accessing Members of Inaccessible Classes
package points;
public class Point { public int x, y; public void move(int dx, int dy) { x += dx; y += dy; } }
and another compilation unit of another package:
package morePoints;
class Point3d extends pointsPoint { public int z; public void move(int dx, int dy, int dz) { supermove(dx, dy); z += dz; } public void move(int dx, int dy) { move(dx, dy, 0); } }
Even though a class might not be declared public, instances of the class might be available at run time to code outside the package in which it is declared by means a public superclass or superinterface An instance of the class can be assigned to a variable of such a public type An invocation of a public method of the object referred to by such a variable may invoke a method of the class if it implements or overrides a method of the public superclass or superinterface (In this situation, the method is necessarily declared public, even though it is declared in a class that is not public) Consider the compilation unit:
the class variable totalMoves can be used only within the class Point; it is not inherited by the subclass Point3d A compile-time error occurs because method move of class Point3d tries to increment totalMoves