重载方法仅通过返回类型是区分不开的,在打算组合的不同接口中,尽量使用不同的方法名,否则可能导致混乱

//: interfaces/InterfaceCollision.javapackage object;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 {  // Identical, no problem:  public int f() { return 1; }}// Methods differ only by return type://!class C5 extends C implements I1 {}//! interface I4 extends I1, I3 {} ///:~