java mixins

mixins.java

class A { 
	public int a() { 
		return 1; 
	}
}

class B1 extends A { 
	public int b() { 
		return a() + 1; 
	}
}

class B2 extends A { 
	public int b() { 
		return a() + 2; 
	}
}

interface C {	
	default int a() {
		return 2;
	}
}

class B1e extends B1 implements C {
	public int a() {
		return C.super.a();
	}
}

class B2e extends B2 implements C {
	public int a() {
		return C.super.a();
	}
}