OnJava8-Examples/interfaces/InterfaceCollision.java
2015-11-15 15:51:35 -08:00

33 lines
813 B
Java

// interfaces/InterfaceCollision.java
// ©2016 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
package interfaces;
interface I1 { void f(); }
interface I2 { int f(int i); }
interface I3 { int f(); }
class C { public int f() { return 1; } }
class C2 implements I1, I2 {
@Override
public void f() {}
@Override
public int f(int i) { return 1; } // overloaded
}
class C3 extends C implements I2 {
@Override
public int f(int i) { return 1; } // overloaded
}
class C4 extends C implements I3 {
// Identical, no problem:
@Override
public int f() { return 1; }
}
// Methods differ only by return type:
//! class C5 extends C implements I1 {}
//! interface I4 extends I1, I3 {}