範例

public class ClassA implements Comparable {
// Comparable 方法實作...
private class ClassB extends ClassA implements Comparable {
// ...
}

}
解決方案 從 ClassB 宣告中,移除 implements Comparable
範例

public class ClassA implements Comparable {
// Comparable 方法實作...
private class ClassB extends ClassA {
// ...
}

}