如何在java中从多重继承中获取所需的返回值？

public interface C {
    ReturnType getValueFromA();
    ReturnType getValueFromB();
}

public class A implements C {
    @Override
    public ReturnType getValueFromA() {
        // 实现获取A的返回值的逻辑
    }

    @Override
    public ReturnType getValueFromB() {
        // 实现获取B的返回值的逻辑
    }
}

public class B implements C {
    @Override
    public ReturnType getValueFromA() {
        // 实现获取A的返回值的逻辑
    }

    @Override
    public ReturnType getValueFromB() {
        // 实现获取B的返回值的逻辑
    }
}

public class Child implements C {
    private A a;
    private B b;

    public Child(A a, B b) {
        this.a = a;
        this.b = b;
    }

    @Override
    public ReturnType getValueFromA() {
        return a.getValueFromA();
    }

    @Override
    public ReturnType getValueFromB() {
        return b.getValueFromB();
    }
}