32 lines
777 B
Java
32 lines
777 B
Java
// interfaces/InterfaceCollision.java
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// (c)2020 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://OnJava8.com for more book information.
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interface I1 { void f(); }
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interface I2 { int f(int i); }
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interface I3 { int f(); }
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class C { public int f() { return 1; } }
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class C2 implements I1, I2 {
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@Override
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public void f() {}
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@Override
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public int f(int i) { return 1; } // overloaded
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}
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class C3 extends C implements I2 {
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@Override
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public int f(int i) { return 1; } // overloaded
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}
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class C4 extends C implements I3 {
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// Identical, no problem:
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@Override
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public int f() { return 1; }
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}
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// Methods differ only by return type:
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//- class C5 extends C implements I1 {}
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//- interface I4 extends I1, I3 {}
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