interfacecollision.java

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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 {
  public void f() {}
  public int f(int i) { return 1; }  // overloaded
}
class C3 extends C implements I2 {
  public int f(int i) {return 1;}    // overloaded
}
class C4 extends C implements I3 {
  public int f() {return 1;}         // 相同署名,override
}

// Methods differ only by return type:
//! class C5 extends C implements I1 {}
//! interface I4 extends I1,I3 {} 
///:~